static void internal_exec_helper( const wchar_t *def,
int block_type,
io_data_t *io )
{
io_data_t *io_internal = io_transmogrify( io );
int is_block_old=is_block;
is_block=1;
/*
Did the transmogrification fail - if so, set error status and return
*/
if( io && !io_internal )
{
proc_set_last_status( STATUS_EXEC_FAIL );
return;
}
signal_unblock();
eval( def, io_internal, block_type );
signal_block();
io_untransmogrify( io, io_internal );
job_reap( 0 );
is_block=is_block_old;
}
int job_reap(bool allow_interactive) {
ASSERT_IS_MAIN_THREAD();
int found = 0;
process_mark_finished_children(false);
// Preserve the exit status.
const int saved_status = proc_get_last_status();
found = process_clean_after_marking(allow_interactive);
// Restore the exit status.
proc_set_last_status(saved_status);
return found;
}
/**
Perform the action of the specified binding
*/
static wint_t input_exec_binding( input_mapping_t *m, const wchar_t *seq )
{
wchar_t code = input_function_get_code( m->command );
if( code != -1 )
{
switch( code )
{
case R_SELF_INSERT:
{
return seq[0];
}
default:
{
return code;
}
}
}
else
{
/*
This key sequence is bound to a command, which
is sent to the parser for evaluation.
*/
int last_status = proc_get_last_status();
eval( m->command, 0, TOP );
proc_set_last_status( last_status );
/*
We still need to return something to the caller, R_NULL
tells the reader that no key press needs to be handled,
and no repaint is needed.
Bindings that produce output should emit a R_REPAINT
function by calling 'commandline -f repaint' to tell
fish that a repaint is in order.
*/
return R_NULL;
}
}
void internal_exec_helper(parser_t &parser, parsed_source_ref_t parsed_source, tnode_t<T> node,
const io_chain_t &ios) {
assert(parsed_source && node && "exec_helper missing source or without node");
io_chain_t morphed_chain;
std::vector<int> opened_fds;
bool transmorgrified = io_transmogrify(ios, &morphed_chain, &opened_fds);
// Did the transmogrification fail - if so, set error status and return.
if (!transmorgrified) {
proc_set_last_status(STATUS_EXEC_FAIL);
return;
}
parser.eval_node(parsed_source, node, morphed_chain, TOP);
morphed_chain.clear();
io_cleanup_fds(opened_fds);
job_reap(0);
}
int main(int argc, char **argv)
{
int res=1;
int my_optind=0;
set_main_thread();
setup_fork_guards();
wsetlocale(LC_ALL, L"");
is_interactive_session=1;
program_name=L"fish";
//struct stat tmp;
//stat("----------FISH_HIT_MAIN----------", &tmp);
std::vector<std::string> cmds;
my_optind = fish_parse_opt(argc, argv, &cmds);
/*
No-exec is prohibited when in interactive mode
*/
if (is_interactive_session && no_exec)
{
debug(1, _(L"Can not use the no-execute mode when running an interactive session"));
no_exec = 0;
}
/* Only save (and therefore restore) the fg process group if we are interactive. See #197, #1002 */
if (is_interactive_session)
{
save_term_foreground_process_group();
}
const struct config_paths_t paths = determine_config_directory_paths(argv[0]);
proc_init();
event_init();
wutil_init();
builtin_init();
function_init();
env_init(&paths);
reader_init();
history_init();
/* For setcolor to support term256 in config.fish (#1022) */
update_fish_term256();
parser_t &parser = parser_t::principal_parser();
if (g_log_forks)
printf("%d: g_fork_count: %d\n", __LINE__, g_fork_count);
const io_chain_t empty_ios;
if (read_init(paths))
{
/* Stop the exit status of any initialization commands (#635) */
proc_set_last_status(STATUS_BUILTIN_OK);
/* Run the commands specified as arguments, if any */
if (! cmds.empty())
{
/* Do something nasty to support OpenSUSE assuming we're bash. This may modify cmds. */
if (is_login)
{
fish_xdm_login_hack_hack_hack_hack(&cmds, argc - my_optind, argv + my_optind);
}
for (size_t i=0; i < cmds.size(); i++)
{
const wcstring cmd_wcs = str2wcstring(cmds.at(i));
res = parser.eval(cmd_wcs, empty_ios, TOP);
}
reader_exit(0, 0);
}
else
{
if (my_optind == argc)
{
res = reader_read(STDIN_FILENO, empty_ios);
}
else
{
char **ptr;
char *file = *(argv+(my_optind++));
int i;
int fd;
if ((fd = open(file, O_RDONLY)) == -1)
{
wperror(L"open");
return 1;
}
// OK to not do this atomically since we cannot have gone multithreaded yet
set_cloexec(fd);
if (*(argv+my_optind))
{
wcstring sb;
for (i=1,ptr = argv+my_optind; *ptr; i++, ptr++)
{
if (i != 1)
sb.append(ARRAY_SEP_STR);
sb.append(str2wcstring(*ptr));
}
env_set(L"argv", sb.c_str(), 0);
}
const wcstring rel_filename = str2wcstring(file);
const wchar_t *abs_filename = wrealpath(rel_filename, NULL);
if (!abs_filename)
{
abs_filename = wcsdup(rel_filename.c_str());
}
reader_push_current_filename(intern(abs_filename));
free((void *)abs_filename);
res = reader_read(fd, empty_ios);
if (res)
{
debug(1,
_(L"Error while reading file %ls\n"),
reader_current_filename()?reader_current_filename(): _(L"Standard input"));
}
reader_pop_current_filename();
}
}
}
proc_fire_event(L"PROCESS_EXIT", EVENT_EXIT, getpid(), res);
restore_term_mode();
restore_term_foreground_process_group();
history_destroy();
proc_destroy();
builtin_destroy();
reader_destroy();
parser.destroy();
wutil_destroy();
event_destroy();
env_destroy();
if (g_log_forks)
printf("%d: g_fork_count: %d\n", __LINE__, g_fork_count);
exit_without_destructors(res ? STATUS_UNKNOWN_COMMAND : proc_get_last_status());
return EXIT_FAILURE; //above line should always exit
}
void job_continue(job_t *j, bool cont) {
// Put job first in the job list.
job_promote(j);
j->set_flag(JOB_NOTIFIED, false);
CHECK_BLOCK();
debug(4, L"%ls job %d, gid %d (%ls), %ls, %ls", cont ? L"Continue" : L"Start", j->job_id,
j->pgid, j->command_wcstr(), job_is_completed(j) ? L"COMPLETED" : L"UNCOMPLETED",
is_interactive ? L"INTERACTIVE" : L"NON-INTERACTIVE");
if (!job_is_completed(j)) {
if (j->get_flag(JOB_TERMINAL) && j->get_flag(JOB_FOREGROUND)) {
// Put the job into the foreground. Hack: ensure that stdin is marked as blocking first
// (issue #176).
make_fd_blocking(STDIN_FILENO);
if (!terminal_give_to_job(j, cont)) return;
}
// Send the job a continue signal, if necessary.
if (cont) {
for (process_ptr_t &p : j->processes) p->stopped = false;
if (j->get_flag(JOB_CONTROL)) {
if (killpg(j->pgid, SIGCONT)) {
wperror(L"killpg (SIGCONT)");
return;
}
} else {
for (const process_ptr_t &p : j->processes) {
if (kill(p->pid, SIGCONT) < 0) {
wperror(L"kill (SIGCONT)");
return;
}
}
}
}
if (j->get_flag(JOB_FOREGROUND)) {
// Look for finished processes first, to avoid select() if it's already done.
process_mark_finished_children(false);
// Wait for job to report.
while (!reader_exit_forced() && !job_is_stopped(j) && !job_is_completed(j)) {
// debug( 1, L"select_try()" );
switch (select_try(j)) {
case 1: {
read_try(j);
process_mark_finished_children(false);
break;
}
case 0: {
// No FDs are ready. Look for finished processes.
process_mark_finished_children(false);
break;
}
case -1: {
// If there is no funky IO magic, we can use waitpid instead of handling
// child deaths through signals. This gives a rather large speed boost (A
// factor 3 startup time improvement on my 300 MHz machine) on short-lived
// jobs.
//
// This will return early if we get a signal, like SIGHUP.
process_mark_finished_children(true);
break;
}
default: {
DIE("unexpected return value from select_try()");
break;
}
}
}
}
}
if (j->get_flag(JOB_FOREGROUND)) {
if (job_is_completed(j)) {
// It's possible that the job will produce output and exit before we've even read from
// it.
//
// We'll eventually read the output, but it may be after we've executed subsequent calls
// This is why my prompt colors kept getting screwed up - the builtin echo calls
// were sometimes having their output combined with the set_color calls in the wrong
// order!
read_try(j);
const std::unique_ptr<process_t> &p = j->processes.back();
// Mark process status only if we are in the foreground and the last process in a pipe,
// and it is not a short circuited builtin.
if ((WIFEXITED(p->status) || WIFSIGNALED(p->status)) && p->pid) {
int status = proc_format_status(p->status);
// fwprintf(stdout, L"setting status %d for %ls\n", job_get_flag( j, JOB_NEGATE
// )?!status:status, j->command);
proc_set_last_status(j->get_flag(JOB_NEGATE) ? !status : status);
}
}
// Put the shell back in the foreground.
if (j->get_flag(JOB_TERMINAL) && j->get_flag(JOB_FOREGROUND)) {
terminal_return_from_job(j);
}
}
}
void exec( job_t *j )
{
process_t *p;
pid_t pid;
int mypipe[2];
sigset_t chldset;
int skip_fork;
io_data_t pipe_read, pipe_write;
io_data_t *tmp;
io_data_t *io_buffer =0;
/*
Set to 1 if something goes wrong while exec:ing the job, in
which case the cleanup code will kick in.
*/
int exec_error=0;
int needs_keepalive = 0;
process_t keepalive;
CHECK( j, );
CHECK_BLOCK();
if( no_exec )
return;
sigemptyset( &chldset );
sigaddset( &chldset, SIGCHLD );
debug( 4, L"Exec job '%ls' with id %d", j->command, j->job_id );
if( block_io )
{
if( j->io )
{
j->io = io_add( io_duplicate( j, block_io), j->io );
}
else
{
j->io=io_duplicate( j, block_io);
}
}
io_data_t *input_redirect;
for( input_redirect = j->io; input_redirect; input_redirect = input_redirect->next )
{
if( (input_redirect->io_mode == IO_BUFFER) &&
input_redirect->is_input )
{
/*
Input redirection - create a new gobetween process to take
care of buffering
*/
process_t *fake = halloc( j, sizeof(process_t) );
fake->type = INTERNAL_BUFFER;
fake->pipe_write_fd = 1;
j->first_process->pipe_read_fd = input_redirect->fd;
fake->next = j->first_process;
j->first_process = fake;
break;
}
}
if( j->first_process->type==INTERNAL_EXEC )
{
/*
Do a regular launch - but without forking first...
*/
signal_block();
/*
setup_child_process makes sure signals are properly set
up. It will also call signal_unblock
*/
if( !setup_child_process( j, 0 ) )
{
/*
launch_process _never_ returns
*/
launch_process( j->first_process );
}
else
{
job_set_flag( j, JOB_CONSTRUCTED, 1 );
j->first_process->completed=1;
return;
}
}
pipe_read.fd=0;
pipe_write.fd=1;
pipe_read.io_mode=IO_PIPE;
pipe_read.param1.pipe_fd[0] = -1;
pipe_read.param1.pipe_fd[1] = -1;
pipe_read.is_input = 1;
pipe_write.io_mode=IO_PIPE;
pipe_write.is_input = 0;
pipe_read.next=0;
pipe_write.next=0;
pipe_write.param1.pipe_fd[0]=pipe_write.param1.pipe_fd[1]=-1;
j->io = io_add( j->io, &pipe_write );
signal_block();
/*
See if we need to create a group keepalive process. This is
a process that we create to make sure that the process group
doesn't die accidentally, and is often needed when a
builtin/block/function is inside a pipeline, since that
usually means we have to wait for one program to exit before
continuing in the pipeline, causing the group leader to
exit.
*/
if( job_get_flag( j, JOB_CONTROL ) )
{
for( p=j->first_process; p; p = p->next )
{
if( p->type != EXTERNAL )
{
if( p->next )
{
needs_keepalive = 1;
break;
}
if( p != j->first_process )
{
needs_keepalive = 1;
break;
}
}
}
}
if( needs_keepalive )
{
keepalive.pid = exec_fork();
if( keepalive.pid == 0 )
{
keepalive.pid = getpid();
set_child_group( j, &keepalive, 1 );
pause();
exit(0);
}
else
{
set_child_group( j, &keepalive, 0 );
}
}
/*
This loop loops over every process_t in the job, starting it as
appropriate. This turns out to be rather complex, since a
process_t can be one of many rather different things.
The loop also has to handle pipelining between the jobs.
*/
for( p=j->first_process; p; p = p->next )
{
mypipe[1]=-1;
skip_fork=0;
pipe_write.fd = p->pipe_write_fd;
pipe_read.fd = p->pipe_read_fd;
// debug( 0, L"Pipe created from fd %d to fd %d", pipe_write.fd, pipe_read.fd );
/*
This call is used so the global environment variable array
is regenerated, if needed, before the fork. That way, we
avoid a lot of duplicate work where EVERY child would need
to generate it, since that result would not get written
back to the parent. This call could be safely removed, but
it would result in slightly lower performance - at least on
uniprocessor systems.
*/
if( p->type == EXTERNAL )
env_export_arr( 1 );
/*
Set up fd:s that will be used in the pipe
*/
if( p == j->first_process->next )
{
j->io = io_add( j->io, &pipe_read );
}
if( p->next )
{
// debug( 1, L"%ls|%ls" , p->argv[0], p->next->argv[0]);
if( exec_pipe( mypipe ) == -1 )
{
debug( 1, PIPE_ERROR );
wperror (L"pipe");
exec_error=1;
break;
}
memcpy( pipe_write.param1.pipe_fd, mypipe, sizeof(int)*2);
}
else
{
/*
This is the last element of the pipeline.
Remove the io redirection for pipe output.
*/
j->io = io_remove( j->io, &pipe_write );
}
switch( p->type )
{
case INTERNAL_FUNCTION:
{
const wchar_t * orig_def;
wchar_t * def=0;
array_list_t *named_arguments;
int shadows;
/*
Calls to function_get_definition might need to
source a file as a part of autoloading, hence there
must be no blocks.
*/
signal_unblock();
orig_def = function_get_definition( p->argv[0] );
named_arguments = function_get_named_arguments( p->argv[0] );
shadows = function_get_shadows( p->argv[0] );
signal_block();
if( orig_def )
{
def = halloc_register( j, wcsdup(orig_def) );
}
if( def == 0 )
{
debug( 0, _( L"Unknown function '%ls'" ), p->argv[0] );
break;
}
parser_push_block( shadows?FUNCTION_CALL:FUNCTION_CALL_NO_SHADOW );
current_block->param2.function_call_process = p;
current_block->param1.function_call_name = halloc_register( current_block, wcsdup( p->argv[0] ) );
/*
set_argv might trigger an event
handler, hence we need to unblock
signals.
*/
signal_unblock();
parse_util_set_argv( p->argv+1, named_arguments );
signal_block();
parser_forbid_function( p->argv[0] );
if( p->next )
{
io_buffer = io_buffer_create( 0 );
j->io = io_add( j->io, io_buffer );
}
internal_exec_helper( def, TOP, j->io );
parser_allow_function();
parser_pop_block();
break;
}
case INTERNAL_BLOCK:
{
if( p->next )
{
io_buffer = io_buffer_create( 0 );
j->io = io_add( j->io, io_buffer );
}
internal_exec_helper( p->argv[0], TOP, j->io );
break;
}
case INTERNAL_BUILTIN:
{
int builtin_stdin=0;
int fg;
int close_stdin=0;
/*
If this is the first process, check the io
redirections and see where we should be reading
from.
*/
if( p == j->first_process )
{
io_data_t *in = io_get( j->io, 0 );
if( in )
{
switch( in->io_mode )
{
case IO_FD:
{
builtin_stdin = in->param1.old_fd;
break;
}
case IO_PIPE:
{
builtin_stdin = in->param1.pipe_fd[0];
break;
}
case IO_FILE:
{
builtin_stdin=wopen( in->param1.filename,
in->param2.flags, OPEN_MASK );
if( builtin_stdin == -1 )
{
debug( 1,
FILE_ERROR,
in->param1.filename );
wperror( L"open" );
}
else
{
close_stdin = 1;
}
break;
}
case IO_CLOSE:
{
/*
FIXME:
When
requesting
that
stdin
be
closed,
we
really
don't
do
anything. How
should
this
be
handled?
*/
builtin_stdin = -1;
break;
}
default:
{
builtin_stdin=-1;
debug( 1,
_( L"Unknown input redirection type %d" ),
in->io_mode);
break;
}
}
}
}
else
{
builtin_stdin = pipe_read.param1.pipe_fd[0];
}
if( builtin_stdin == -1 )
{
exec_error=1;
break;
}
else
{
int old_out = builtin_out_redirect;
int old_err = builtin_err_redirect;
/*
Since this may be the foreground job, and since
a builtin may execute another foreground job,
we need to pretend to suspend this job while
running the builtin, in order to avoid a
situation where two jobs are running at once.
The reason this is done here, and not by the
relevant builtins, is that this way, the
builtin does not need to know what job it is
part of. It could probably figure that out by
walking the job list, but it seems more robust
to make exec handle things.
*/
builtin_push_io( builtin_stdin );
builtin_out_redirect = has_fd( j->io, 1 );
builtin_err_redirect = has_fd( j->io, 2 );
fg = job_get_flag( j, JOB_FOREGROUND );
job_set_flag( j, JOB_FOREGROUND, 0 );
signal_unblock();
p->status = builtin_run( p->argv, j->io );
builtin_out_redirect=old_out;
builtin_err_redirect=old_err;
signal_block();
/*
Restore the fg flag, which is temporarily set to
false during builtin execution so as not to confuse
some job-handling builtins.
*/
job_set_flag( j, JOB_FOREGROUND, fg );
}
/*
If stdin has been redirected, close the redirection
stream.
*/
if( close_stdin )
{
exec_close( builtin_stdin );
}
break;
}
}
if( exec_error )
{
break;
}
switch( p->type )
{
case INTERNAL_BLOCK:
case INTERNAL_FUNCTION:
{
int status = proc_get_last_status();
/*
Handle output from a block or function. This usually
means do nothing, but in the case of pipes, we have
to buffer such io, since otherwise the internal pipe
buffer might overflow.
*/
if( !io_buffer )
{
/*
No buffer, so we exit directly. This means we
have to manually set the exit status.
*/
if( p->next == 0 )
{
proc_set_last_status( job_get_flag( j, JOB_NEGATE )?(!status):status);
}
p->completed = 1;
break;
}
j->io = io_remove( j->io, io_buffer );
io_buffer_read( io_buffer );
if( io_buffer->param2.out_buffer->used != 0 )
{
pid = exec_fork();
if( pid == 0 )
{
/*
This is the child process. Write out the contents of the pipeline.
*/
p->pid = getpid();
setup_child_process( j, p );
exec_write_and_exit(io_buffer->fd,
io_buffer->param2.out_buffer->buff,
io_buffer->param2.out_buffer->used,
status);
}
else
{
/*
This is the parent process. Store away
information on the child, and possibly give
it control over the terminal.
*/
p->pid = pid;
set_child_group( j, p, 0 );
}
}
else
{
if( p->next == 0 )
{
proc_set_last_status( job_get_flag( j, JOB_NEGATE )?(!status):status);
}
p->completed = 1;
}
io_buffer_destroy( io_buffer );
io_buffer=0;
break;
}
case INTERNAL_BUFFER:
{
pid = exec_fork();
if( pid == 0 )
{
/*
This is the child process. Write out the
contents of the pipeline.
*/
p->pid = getpid();
setup_child_process( j, p );
exec_write_and_exit( 1,
input_redirect->param2.out_buffer->buff,
input_redirect->param2.out_buffer->used,
0);
}
else
{
/*
This is the parent process. Store away
information on the child, and possibly give
it control over the terminal.
*/
p->pid = pid;
set_child_group( j, p, 0 );
}
break;
}
case INTERNAL_BUILTIN:
{
int skip_fork;
/*
Handle output from builtin commands. In the general
case, this means forking of a worker process, that
will write out the contents of the stdout and stderr
buffers to the correct file descriptor. Since
forking is expensive, fish tries to avoid it wehn
possible.
*/
/*
If a builtin didn't produce any output, and it is
not inside a pipeline, there is no need to fork
*/
skip_fork =
( !sb_out->used ) &&
( !sb_err->used ) &&
( !p->next );
/*
If the output of a builtin is to be sent to an internal
buffer, there is no need to fork. This helps out the
performance quite a bit in complex completion code.
*/
io_data_t *io = io_get( j->io, 1 );
int buffer_stdout = io && io->io_mode == IO_BUFFER;
if( ( !sb_err->used ) &&
( !p->next ) &&
( sb_out->used ) &&
( buffer_stdout ) )
{
char *res = wcs2str( (wchar_t *)sb_out->buff );
b_append( io->param2.out_buffer, res, strlen( res ) );
skip_fork = 1;
free( res );
}
for( io = j->io; io; io=io->next )
{
if( io->io_mode == IO_FILE && wcscmp(io->param1.filename, L"/dev/null" ))
{
skip_fork = 0;
}
}
if( skip_fork )
{
p->completed=1;
if( p->next == 0 )
{
debug( 3, L"Set status of %ls to %d using short circut", j->command, p->status );
int status = proc_format_status(p->status);
proc_set_last_status( job_get_flag( j, JOB_NEGATE )?(!status):status );
}
break;
}
/*
Ok, unfortunatly, we have to do a real fork. Bummer.
*/
pid = exec_fork();
if( pid == 0 )
{
/*
This is the child process. Setup redirections,
print correct output to stdout and stderr, and
then exit.
*/
p->pid = getpid();
setup_child_process( j, p );
do_builtin_io( sb_out->used ? (wchar_t *)sb_out->buff : 0, sb_err->used ? (wchar_t *)sb_err->buff : 0 );
exit( p->status );
}
else
{
/*
This is the parent process. Store away
information on the child, and possibly give
it control over the terminal.
*/
p->pid = pid;
set_child_group( j, p, 0 );
}
break;
}
case EXTERNAL:
{
pid = exec_fork();
if( pid == 0 )
{
/*
This is the child process.
*/
p->pid = getpid();
setup_child_process( j, p );
launch_process( p );
/*
launch_process _never_ returns...
*/
}
else
{
/*
This is the parent process. Store away
information on the child, and possibly fice
it control over the terminal.
*/
p->pid = pid;
set_child_group( j, p, 0 );
}
break;
}
}
if( p->type == INTERNAL_BUILTIN )
builtin_pop_io();
/*
Close the pipe the current process uses to read from the
previous process_t
*/
if( pipe_read.param1.pipe_fd[0] >= 0 )
exec_close( pipe_read.param1.pipe_fd[0] );
/*
Set up the pipe the next process uses to read from the
current process_t
*/
if( p->next )
pipe_read.param1.pipe_fd[0] = mypipe[0];
/*
If there is a next process in the pipeline, close the
output end of the current pipe (the surrent child
subprocess already has a copy of the pipe - this makes sure
we don't leak file descriptors either in the shell or in
the children).
*/
if( p->next )
{
exec_close(mypipe[1]);
}
}
/*
The keepalive process is no longer needed, so we terminate it
with extreme prejudice
*/
if( needs_keepalive )
{
kill( keepalive.pid, SIGKILL );
}
signal_unblock();
debug( 3, L"Job is constructed" );
j->io = io_remove( j->io, &pipe_read );
for( tmp = block_io; tmp; tmp=tmp->next )
j->io = io_remove( j->io, tmp );
job_set_flag( j, JOB_CONSTRUCTED, 1 );
if( !job_get_flag( j, JOB_FOREGROUND ) )
{
proc_last_bg_pid = j->pgid;
}
if( !exec_error )
{
job_continue (j, 0);
}
}
int main(int argc, char **argv) {
int res = 1;
int my_optind = 0;
program_name = L"fish";
set_main_thread();
setup_fork_guards();
setlocale(LC_ALL, "");
fish_setlocale();
// struct stat tmp;
// stat("----------FISH_HIT_MAIN----------", &tmp);
if (!argv[0]) {
static const char *dummy_argv[2] = {"fish", NULL};
argv = (char **)dummy_argv; //!OCLINT(parameter reassignment)
argc = 1; //!OCLINT(parameter reassignment)
}
std::vector<std::string> cmds;
my_optind = fish_parse_opt(argc, argv, &cmds);
// No-exec is prohibited when in interactive mode.
if (is_interactive_session && no_exec) {
debug(1, _(L"Can not use the no-execute mode when running an interactive session"));
no_exec = 0;
}
// Only save (and therefore restore) the fg process group if we are interactive. See issues
// #197 and #1002.
if (is_interactive_session) {
save_term_foreground_process_group();
}
const struct config_paths_t paths = determine_config_directory_paths(argv[0]);
proc_init();
event_init();
builtin_init();
function_init();
env_init(&paths);
reader_init();
history_init();
// For set_color to support term256 in config.fish (issue #1022).
update_fish_color_support();
misc_init();
parser_t &parser = parser_t::principal_parser();
const io_chain_t empty_ios;
if (read_init(paths)) {
// Stomp the exit status of any initialization commands (issue #635).
proc_set_last_status(STATUS_BUILTIN_OK);
// Run the commands specified as arguments, if any.
if (!cmds.empty()) {
// Do something nasty to support OpenSUSE assuming we're bash. This may modify cmds.
if (is_login) {
fish_xdm_login_hack_hack_hack_hack(&cmds, argc - my_optind, argv + my_optind);
}
for (size_t i = 0; i < cmds.size(); i++) {
const wcstring cmd_wcs = str2wcstring(cmds.at(i));
res = parser.eval(cmd_wcs, empty_ios, TOP);
}
reader_exit(0, 0);
} else if (my_optind == argc) {
// Interactive mode
check_running_fishd();
res = reader_read(STDIN_FILENO, empty_ios);
} else {
char *file = *(argv + (my_optind++));
int fd = open(file, O_RDONLY);
if (fd == -1) {
perror(file);
} else {
// OK to not do this atomically since we cannot have gone multithreaded yet.
set_cloexec(fd);
if (*(argv + my_optind)) {
wcstring sb;
char **ptr;
int i;
for (i = 1, ptr = argv + my_optind; *ptr; i++, ptr++) {
if (i != 1) sb.append(ARRAY_SEP_STR);
sb.append(str2wcstring(*ptr));
}
env_set(L"argv", sb.c_str(), 0);
}
const wcstring rel_filename = str2wcstring(file);
reader_push_current_filename(rel_filename.c_str());
res = reader_read(fd, empty_ios);
if (res) {
debug(1, _(L"Error while reading file %ls\n"), reader_current_filename()
? reader_current_filename()
: _(L"Standard input"));
}
reader_pop_current_filename();
}
}
}
int exit_status = res ? STATUS_UNKNOWN_COMMAND : proc_get_last_status();
proc_fire_event(L"PROCESS_EXIT", EVENT_EXIT, getpid(), exit_status);
restore_term_mode();
restore_term_foreground_process_group();
if (g_profiling_active) {
parser.emit_profiling(s_profiling_output_filename);
}
history_destroy();
proc_destroy();
builtin_destroy();
reader_destroy();
event_destroy();
exit_without_destructors(exit_status);
return EXIT_FAILURE; // above line should always exit
}
/**
Perform the specified event. Since almost all event firings will
not be matched by even a single event handler, we make sure to
optimize the 'no matches' path. This means that nothing is
allocated/initialized unless needed.
*/
static void event_fire_internal(const event_t &event)
{
event_list_t fire;
/*
First we free all events that have been removed, but only if this
invocation of event_fire_internal is not a recursive call.
*/
if (is_event <= 1)
event_free_kills();
if (events.empty())
return;
/*
Then we iterate over all events, adding events that should be
fired to a second list. We need to do this in a separate step
since an event handler might call event_remove or
event_add_handler, which will change the contents of the \c
events list.
*/
for (size_t i=0; i<events.size(); i++)
{
event_t *criterion = events.at(i);
/*
Check if this event is a match
*/
if (event_match(*criterion, event))
{
fire.push_back(criterion);
}
}
/*
No matches. Time to return.
*/
if (fire.empty())
return;
if (signal_is_blocked())
{
/* Fix for https://github.com/fish-shell/fish-shell/issues/608. Don't run event handlers while signals are blocked. */
event_t *heap_event = new event_t(event);
input_common_add_callback(fire_event_callback, heap_event);
return;
}
/*
Iterate over our list of matching events
*/
for (size_t i=0; i<fire.size(); i++)
{
event_t *criterion = fire.at(i);
int prev_status;
/*
Check if this event has been removed, if so, dont fire it
*/
if (event_is_killed(*criterion))
continue;
/*
Fire event
*/
wcstring buffer = criterion->function_name;
for (size_t j=0; j < event.arguments.size(); j++)
{
wcstring arg_esc = escape_string(event.arguments.at(j), 1);
buffer += L" ";
buffer += arg_esc;
}
// debug( 1, L"Event handler fires command '%ls'", buffer.c_str() );
/*
Event handlers are not part of the main flow of code, so
they are marked as non-interactive
*/
proc_push_interactive(0);
prev_status = proc_get_last_status();
parser_t &parser = parser_t::principal_parser();
block_t *block = new event_block_t(event);
parser.push_block(block);
parser.eval(buffer, io_chain_t(), TOP);
parser.pop_block();
proc_pop_interactive();
proc_set_last_status(prev_status);
}
/*
Free killed events
*/
if (is_event <= 1)
event_free_kills();
}
/// Execute a block node or function "process".
/// \p user_ios contains the list of user-specified ios, used so we can avoid stomping on them with
/// our pipes. \return true on success, false on error.
static bool exec_block_or_func_process(parser_t &parser, job_t *j, process_t *p,
const io_chain_t &user_ios, io_chain_t io_chain) {
assert((p->type == INTERNAL_FUNCTION || p->type == INTERNAL_BLOCK_NODE) &&
"Unexpected process type");
// Create an output buffer if we're piping to another process.
shared_ptr<io_buffer_t> block_output_io_buffer{};
if (!p->is_last_in_job) {
// Be careful to handle failure, e.g. too many open fds.
block_output_io_buffer = io_buffer_t::create(STDOUT_FILENO, user_ios);
if (!block_output_io_buffer) {
job_mark_process_as_failed(j, p);
return false;
} else {
// This looks sketchy, because we're adding this io buffer locally - they
// aren't in the process or job redirection list. Therefore select_try won't
// be able to read them. However we call block_output_io_buffer->read()
// below, which reads until EOF. So there's no need to select on this.
io_chain.push_back(block_output_io_buffer);
}
}
if (p->type == INTERNAL_FUNCTION) {
const wcstring func_name = p->argv0();
auto props = function_get_properties(func_name);
if (!props) {
debug(0, _(L"Unknown function '%ls'"), p->argv0());
return false;
}
const std::map<wcstring, env_var_t> inherit_vars = function_get_inherit_vars(func_name);
function_block_t *fb =
parser.push_block<function_block_t>(p, func_name, props->shadow_scope);
function_prepare_environment(func_name, p->get_argv() + 1, inherit_vars);
parser.forbid_function(func_name);
internal_exec_helper(parser, props->parsed_source, props->body_node, io_chain);
parser.allow_function();
parser.pop_block(fb);
} else {
assert(p->type == INTERNAL_BLOCK_NODE);
assert(p->block_node_source && p->internal_block_node && "Process is missing node info");
internal_exec_helper(parser, p->block_node_source, p->internal_block_node, io_chain);
}
int status = proc_get_last_status();
// Handle output from a block or function. This usually means do nothing, but in the
// case of pipes, we have to buffer such io, since otherwise the internal pipe
// buffer might overflow.
if (!block_output_io_buffer.get()) {
// No buffer, so we exit directly. This means we have to manually set the exit
// status.
if (p->is_last_in_job) {
proc_set_last_status(j->get_flag(job_flag_t::NEGATE) ? (!status) : status);
}
p->completed = 1;
return true;
}
// Here we must have a non-NULL block_output_io_buffer.
assert(block_output_io_buffer.get() != NULL);
io_chain.remove(block_output_io_buffer);
block_output_io_buffer->read();
const std::string buffer_contents = block_output_io_buffer->buffer().newline_serialized();
const char *buffer = buffer_contents.data();
size_t count = buffer_contents.size();
if (count > 0) {
// We don't have to drain threads here because our child process is simple.
const char *fork_reason =
p->type == INTERNAL_BLOCK_NODE ? "internal block io" : "internal function io";
if (!fork_child_for_process(j, p, io_chain, false, fork_reason, [&] {
exec_write_and_exit(block_output_io_buffer->fd, buffer, count, status);
})) {
return false;
}
} else {
if (p->is_last_in_job) {
proc_set_last_status(j->get_flag(job_flag_t::NEGATE) ? (!status) : status);
}
p->completed = 1;
}
return true;
}
/// Handle output from a builtin, by printing the contents of builtin_io_streams to the redirections
/// given in io_chain.
static bool handle_builtin_output(job_t *j, process_t *p, io_chain_t *io_chain,
const io_streams_t &builtin_io_streams) {
assert(p->type == INTERNAL_BUILTIN && "Process is not a builtin");
// Handle output from builtin commands. In the general case, this means forking of a
// worker process, that will write out the contents of the stdout and stderr buffers
// to the correct file descriptor. Since forking is expensive, fish tries to avoid
// it when possible.
bool fork_was_skipped = false;
const shared_ptr<io_data_t> stdout_io = io_chain->get_io_for_fd(STDOUT_FILENO);
const shared_ptr<io_data_t> stderr_io = io_chain->get_io_for_fd(STDERR_FILENO);
const output_stream_t &stdout_stream = builtin_io_streams.out;
const output_stream_t &stderr_stream = builtin_io_streams.err;
// If we are outputting to a file, we have to actually do it, even if we have no
// output, so that we can truncate the file. Does not apply to /dev/null.
bool must_fork = redirection_is_to_real_file(stdout_io.get()) ||
redirection_is_to_real_file(stderr_io.get());
if (!must_fork && p->is_last_in_job) {
// We are handling reads directly in the main loop. Note that we may still end
// up forking.
const bool stdout_is_to_buffer = stdout_io && stdout_io->io_mode == IO_BUFFER;
const bool no_stdout_output = stdout_stream.empty();
const bool no_stderr_output = stderr_stream.empty();
const bool stdout_discarded = stdout_stream.buffer().discarded();
if (!stdout_discarded && no_stdout_output && no_stderr_output) {
// The builtin produced no output and is not inside of a pipeline. No
// need to fork or even output anything.
debug(4, L"Skipping fork: no output for internal builtin '%ls'", p->argv0());
fork_was_skipped = true;
} else if (no_stderr_output && stdout_is_to_buffer) {
// The builtin produced no stderr, and its stdout is going to an
// internal buffer. There is no need to fork. This helps out the
// performance quite a bit in complex completion code.
// TODO: we're sloppy about handling explicitly separated output.
// Theoretically we could have explicitly separated output on stdout and
// also stderr output; in that case we ought to thread the exp-sep output
// through to the io buffer. We're getting away with this because the only
// thing that can output exp-sep output is `string split0` which doesn't
// also produce stderr.
debug(4, L"Skipping fork: buffered output for internal builtin '%ls'", p->argv0());
io_buffer_t *io_buffer = static_cast<io_buffer_t *>(stdout_io.get());
io_buffer->append_from_stream(stdout_stream);
fork_was_skipped = true;
} else if (stdout_io.get() == NULL && stderr_io.get() == NULL) {
// We are writing to normal stdout and stderr. Just do it - no need to fork.
debug(4, L"Skipping fork: ordinary output for internal builtin '%ls'", p->argv0());
const std::string outbuff = wcs2string(stdout_stream.contents());
const std::string errbuff = wcs2string(stderr_stream.contents());
bool builtin_io_done =
do_builtin_io(outbuff.data(), outbuff.size(), errbuff.data(), errbuff.size());
if (!builtin_io_done && errno != EPIPE) {
redirect_tty_output(); // workaround glibc bug
debug(0, "!builtin_io_done and errno != EPIPE");
show_stackframe(L'E');
}
if (stdout_discarded) p->status = STATUS_READ_TOO_MUCH;
fork_was_skipped = true;
}
}
if (fork_was_skipped) {
p->completed = 1;
if (p->is_last_in_job) {
debug(4, L"Set status of job %d (%ls) to %d using short circuit", j->job_id,
j->preview().c_str(), p->status);
int status = p->status;
proc_set_last_status(j->get_flag(job_flag_t::NEGATE) ? (!status) : status);
}
} else {
// Ok, unfortunately, we have to do a real fork. Bummer. We work hard to make
// sure we don't have to wait for all our threads to exit, by arranging things
// so that we don't have to allocate memory or do anything except system calls
// in the child.
//
// These strings may contain embedded nulls, so don't treat them as C strings.
const std::string outbuff_str = wcs2string(stdout_stream.contents());
const char *outbuff = outbuff_str.data();
size_t outbuff_len = outbuff_str.size();
const std::string errbuff_str = wcs2string(stderr_stream.contents());
const char *errbuff = errbuff_str.data();
size_t errbuff_len = errbuff_str.size();
fflush(stdout);
fflush(stderr);
if (!fork_child_for_process(j, p, *io_chain, false, "internal builtin", [&] {
do_builtin_io(outbuff, outbuff_len, errbuff, errbuff_len);
exit_without_destructors(p->status);
})) {
return false;
}
}
return true;
}
static int exec_subshell_internal(const wcstring &cmd, wcstring_list_t *lst, bool apply_exit_status,
bool is_subcmd) {
ASSERT_IS_MAIN_THREAD();
bool prev_subshell = is_subshell;
const int prev_status = proc_get_last_status();
bool split_output = false;
const auto ifs = env_get(L"IFS");
if (!ifs.missing_or_empty()) {
split_output = true;
}
is_subshell = true;
int subcommand_status = -1; // assume the worst
// IO buffer creation may fail (e.g. if we have too many open files to make a pipe), so this may
// be null.
const shared_ptr<io_buffer_t> io_buffer(
io_buffer_t::create(STDOUT_FILENO, io_chain_t(), is_subcmd ? read_byte_limit : 0));
if (io_buffer.get() != NULL) {
parser_t &parser = parser_t::principal_parser();
if (parser.eval(cmd, io_chain_t(io_buffer), SUBST) == 0) {
subcommand_status = proc_get_last_status();
}
io_buffer->read();
}
if (io_buffer->buffer().discarded()) subcommand_status = STATUS_READ_TOO_MUCH;
// If the caller asked us to preserve the exit status, restore the old status. Otherwise set the
// status of the subcommand.
proc_set_last_status(apply_exit_status ? subcommand_status : prev_status);
is_subshell = prev_subshell;
if (lst == NULL || io_buffer.get() == NULL) {
return subcommand_status;
}
// Walk over all the elements.
for (const auto &elem : io_buffer->buffer().elements()) {
if (elem.is_explicitly_separated()) {
// Just append this one.
lst->push_back(str2wcstring(elem.contents));
continue;
}
// Not explicitly separated. We have to split it explicitly.
assert(!elem.is_explicitly_separated() && "should not be explicitly separated");
const char *begin = elem.contents.data();
const char *end = begin + elem.contents.size();
if (split_output) {
const char *cursor = begin;
while (cursor < end) {
// Look for the next separator.
const char *stop = (const char *)memchr(cursor, '\n', end - cursor);
const bool hit_separator = (stop != NULL);
if (!hit_separator) {
// If it's not found, just use the end.
stop = end;
}
// Stop now points at the first character we do not want to copy.
lst->push_back(str2wcstring(cursor, stop - cursor));
// If we hit a separator, skip over it; otherwise we're at the end.
cursor = stop + (hit_separator ? 1 : 0);
}
} else {
// We're not splitting output, but we still want to trim off a trailing newline.
if (end != begin && end[-1] == '\n') {
--end;
}
lst->push_back(str2wcstring(begin, end - begin));
}
}
return subcommand_status;
}
int job_reap(bool interactive)
{
ASSERT_IS_MAIN_THREAD();
job_t *jnext;
int found=0;
/* job_reap may fire an event handler, we do not want to call ourselves recursively (to avoid infinite recursion). */
static bool locked = false;
if (locked)
{
return 0;
}
locked = true;
process_mark_finished_children(false);
/* Preserve the exit status */
const int saved_status = proc_get_last_status();
job_iterator_t jobs;
const size_t job_count = jobs.count();
jnext = jobs.next();
while (jnext)
{
job_t *j = jnext;
jnext = jobs.next();
/*
If we are reaping only jobs who do not need status messages
sent to the console, do not consider reaping jobs that need
status messages
*/
if ((!job_get_flag(j, JOB_SKIP_NOTIFICATION)) && (!interactive) && (!job_get_flag(j, JOB_FOREGROUND)))
{
continue;
}
for (process_t *p = j->first_process; p; p=p->next)
{
int s;
if (!p->completed)
continue;
if (!p->pid)
continue;
s = p->status;
proc_fire_event(L"PROCESS_EXIT", EVENT_EXIT, p->pid, (WIFSIGNALED(s)?-1:WEXITSTATUS(s)));
if (WIFSIGNALED(s))
{
/*
Ignore signal SIGPIPE.We issue it ourselves to the pipe
writer when the pipe reader dies.
*/
if (WTERMSIG(s) != SIGPIPE)
{
int proc_is_job = ((p==j->first_process) && (p->next == 0));
if (proc_is_job)
job_set_flag(j, JOB_NOTIFIED, 1);
if (!job_get_flag(j, JOB_SKIP_NOTIFICATION))
{
/* Print nothing if we get SIGINT in the foreground process group, to avoid spamming obvious stuff on the console (#1119). If we get SIGINT for the foreground process, assume the user typed ^C and can see it working. It's possible they didn't, and the signal was delivered via pkill, etc., but the SIGINT/SIGTERM distinction is precisely to allow INT to be from a UI and TERM to be programmatic, so this assumption is keeping with the design of signals.
If echoctl is on, then the terminal will have written ^C to the console. If off, it won't have. We don't echo ^C either way, so as to respect the user's preference. */
if (WTERMSIG(p->status) != SIGINT || ! job_get_flag(j, JOB_FOREGROUND))
{
if (proc_is_job)
{
// We want to report the job number, unless it's the only job, in which case we don't need to
const wcstring job_number_desc = (job_count == 1) ? wcstring() : format_string(L"Job %d, ", j->job_id);
fwprintf(stdout,
_(L"%ls: %ls\'%ls\' terminated by signal %ls (%ls)"),
program_name,
job_number_desc.c_str(),
truncate_command(j->command()).c_str(),
sig2wcs(WTERMSIG(p->status)),
signal_get_desc(WTERMSIG(p->status)));
}
else
{
const wcstring job_number_desc = (job_count == 1) ? wcstring() : format_string(L"from job %d, ", j->job_id);
fwprintf(stdout,
_(L"%ls: Process %d, \'%ls\' %ls\'%ls\' terminated by signal %ls (%ls)"),
program_name,
p->pid,
p->argv0(),
job_number_desc.c_str(),
truncate_command(j->command()).c_str(),
sig2wcs(WTERMSIG(p->status)),
signal_get_desc(WTERMSIG(p->status)));
}
tputs(clr_eol,1,&writeb);
fwprintf(stdout, L"\n");
}
found=1;
}
/*
Clear status so it is not reported more than once
*/
p->status = 0;
}
}
}
/*
If all processes have completed, tell the user the job has
completed and delete it from the active job list.
*/
if (job_is_completed(j))
{
if (!job_get_flag(j, JOB_FOREGROUND) && !job_get_flag(j, JOB_NOTIFIED) && !job_get_flag(j, JOB_SKIP_NOTIFICATION))
{
format_job_info(j, _(L"ended"), job_count);
found=1;
}
proc_fire_event(L"JOB_EXIT", EVENT_EXIT, -j->pgid, 0);
proc_fire_event(L"JOB_EXIT", EVENT_JOB_ID, j->job_id, 0);
job_free(j);
}
else if (job_is_stopped(j) && !job_get_flag(j, JOB_NOTIFIED))
{
/*
Notify the user about newly stopped jobs.
*/
if (!job_get_flag(j, JOB_SKIP_NOTIFICATION))
{
format_job_info(j, _(L"stopped"), job_count);
found=1;
}
job_set_flag(j, JOB_NOTIFIED, 1);
}
}
if (found)
fflush(stdout);
/* Restore the exit status. */
proc_set_last_status(saved_status);
locked = false;
return found;
}
void job_continue(job_t *j, bool cont)
{
/*
Put job first in the job list
*/
job_promote(j);
job_set_flag(j, JOB_NOTIFIED, 0);
CHECK_BLOCK();
debug(4,
L"Continue job %d, gid %d (%ls), %ls, %ls",
j->job_id,
j->pgid,
j->command_wcstr(),
job_is_completed(j)?L"COMPLETED":L"UNCOMPLETED",
is_interactive?L"INTERACTIVE":L"NON-INTERACTIVE");
if (!job_is_completed(j))
{
if (job_get_flag(j, JOB_TERMINAL) && job_get_flag(j, JOB_FOREGROUND))
{
/* Put the job into the foreground. Hack: ensure that stdin is marked as blocking first (#176). */
make_fd_blocking(STDIN_FILENO);
signal_block();
bool ok = terminal_give_to_job(j, cont);
signal_unblock();
if (!ok)
return;
}
/*
Send the job a continue signal, if necessary.
*/
if (cont)
{
process_t *p;
for (p=j->first_process; p; p=p->next)
p->stopped=0;
if (job_get_flag(j, JOB_CONTROL))
{
if (killpg(j->pgid, SIGCONT))
{
wperror(L"killpg (SIGCONT)");
return;
}
}
else
{
for (p=j->first_process; p; p=p->next)
{
if (kill(p->pid, SIGCONT) < 0)
{
wperror(L"kill (SIGCONT)");
return;
}
}
}
}
if (job_get_flag(j, JOB_FOREGROUND))
{
/* Look for finished processes first, to avoid select() if it's already done. */
process_mark_finished_children(false);
/*
Wait for job to report.
*/
while (! reader_exit_forced() && ! job_is_stopped(j) && ! job_is_completed(j))
{
// debug( 1, L"select_try()" );
switch (select_try(j))
{
case 1:
{
read_try(j);
process_mark_finished_children(false);
break;
}
case 0:
{
/* No FDs are ready. Look for finished processes. */
process_mark_finished_children(false);
break;
}
case -1:
{
/*
If there is no funky IO magic, we can use
waitpid instead of handling child deaths
through signals. This gives a rather large
speed boost (A factor 3 startup time
improvement on my 300 MHz machine) on
short-lived jobs.
This will return early if we get a signal,
like SIGHUP.
*/
process_mark_finished_children(true);
break;
}
}
}
}
}
if (job_get_flag(j, JOB_FOREGROUND))
{
if (job_is_completed(j))
{
// It's possible that the job will produce output and exit before we've even read from it.
// We'll eventually read the output, but it may be after we've executed subsequent calls
// This is why my prompt colors kept getting screwed up - the builtin echo calls
// were sometimes having their output combined with the set_color calls in the wrong order!
read_try(j);
process_t *p = j->first_process;
while (p->next)
p = p->next;
if (WIFEXITED(p->status) || WIFSIGNALED(p->status))
{
/*
Mark process status only if we are in the foreground
and the last process in a pipe, and it is not a short circuited builtin
*/
if (p->pid)
{
int status = proc_format_status(p->status);
//wprintf(L"setting status %d for %ls\n", job_get_flag( j, JOB_NEGATE )?!status:status, j->command);
proc_set_last_status(job_get_flag(j, JOB_NEGATE)?!status:status);
}
}
}
/* Put the shell back in the foreground. */
if (job_get_flag(j, JOB_TERMINAL) && job_get_flag(j, JOB_FOREGROUND))
{
int ok;
signal_block();
ok = terminal_return_from_job(j);
signal_unblock();
if (!ok)
return;
}
}
}
int main(int argc, char **argv) {
int res = 1;
int my_optind = 0;
program_name = L"fish";
set_main_thread();
setup_fork_guards();
signal_unblock_all();
setlocale(LC_ALL, "");
fish_setlocale();
// struct stat tmp;
// stat("----------FISH_HIT_MAIN----------", &tmp);
if (!argv[0]) {
static const char *dummy_argv[2] = {"fish", NULL};
argv = (char **)dummy_argv; //!OCLINT(parameter reassignment)
argc = 1; //!OCLINT(parameter reassignment)
}
fish_cmd_opts_t opts;
my_optind = fish_parse_opt(argc, argv, &opts);
// No-exec is prohibited when in interactive mode.
if (is_interactive_session && no_exec) {
debug(1, _(L"Can not use the no-execute mode when running an interactive session"));
no_exec = 0;
}
// Only save (and therefore restore) the fg process group if we are interactive. See issues
// #197 and #1002.
if (is_interactive_session) {
save_term_foreground_process_group();
}
const struct config_paths_t paths = determine_config_directory_paths(argv[0]);
env_init(&paths);
// Set features early in case other initialization depends on them.
// Start with the ones set in the environment, then those set on the command line (so the
// command line takes precedence).
if (auto features_var = env_get(L"fish_features")) {
for (const wcstring &s : features_var->as_list()) {
mutable_fish_features().set_from_string(s);
}
}
mutable_fish_features().set_from_string(opts.features);
proc_init();
builtin_init();
misc_init();
reader_init();
parser_t &parser = parser_t::principal_parser();
const io_chain_t empty_ios;
if (read_init(paths)) {
// Stomp the exit status of any initialization commands (issue #635).
proc_set_last_status(STATUS_CMD_OK);
// Run post-config commands specified as arguments, if any.
if (!opts.postconfig_cmds.empty()) {
res = run_command_list(&opts.postconfig_cmds, empty_ios);
}
if (!opts.batch_cmds.empty()) {
// Run the commands specified as arguments, if any.
if (is_login) {
// Do something nasty to support OpenSUSE assuming we're bash. This may modify cmds.
fish_xdm_login_hack_hack_hack_hack(&opts.batch_cmds, argc - my_optind,
argv + my_optind);
}
res = run_command_list(&opts.batch_cmds, empty_ios);
reader_exit(0, 0);
} else if (my_optind == argc) {
// Implicitly interactive mode.
res = reader_read(STDIN_FILENO, empty_ios);
} else {
char *file = *(argv + (my_optind++));
int fd = open(file, O_RDONLY);
if (fd == -1) {
perror(file);
} else {
// OK to not do this atomically since we cannot have gone multithreaded yet.
set_cloexec(fd);
wcstring_list_t list;
for (char **ptr = argv + my_optind; *ptr; ptr++) {
list.push_back(str2wcstring(*ptr));
}
env_set(L"argv", ENV_DEFAULT, list);
const wcstring rel_filename = str2wcstring(file);
reader_push_current_filename(rel_filename.c_str());
res = reader_read(fd, empty_ios);
if (res) {
debug(1, _(L"Error while reading file %ls\n"),
reader_current_filename() ? reader_current_filename()
: _(L"Standard input"));
}
reader_pop_current_filename();
}
}
}
int exit_status = res ? STATUS_CMD_UNKNOWN : proc_get_last_status();
// TODO: The generic process-exit event is useless and unused.
// Remove this in future.
proc_fire_event(L"PROCESS_EXIT", EVENT_EXIT, getpid(), exit_status);
event_fire_generic(L"fish_exit");
restore_term_mode();
restore_term_foreground_process_group();
if (g_profiling_active) {
parser.emit_profiling(s_profiling_output_filename);
}
history_save_all();
proc_destroy();
exit_without_destructors(exit_status);
return EXIT_FAILURE; // above line should always exit
}
int job_reap(bool interactive)
{
ASSERT_IS_MAIN_THREAD();
job_t *jnext;
int found=0;
static int locked = 0;
locked++;
/* Preserve the exit status */
const int saved_status = proc_get_last_status();
/*
job_read may fire an event handler, we do not want to call
ourselves recursively (to avoid infinite recursion).
*/
if (locked>1)
return 0;
job_iterator_t jobs;
jnext = jobs.next();
while (jnext)
{
job_t *j = jnext;
jnext = jobs.next();
/*
If we are reaping only jobs who do not need status messages
sent to the console, do not consider reaping jobs that need
status messages
*/
if ((!job_get_flag(j, JOB_SKIP_NOTIFICATION)) && (!interactive) && (!job_get_flag(j, JOB_FOREGROUND)))
{
continue;
}
for (process_t *p = j->first_process; p; p=p->next)
{
int s;
if (!p->completed)
continue;
if (!p->pid)
continue;
s = p->status;
proc_fire_event(L"PROCESS_EXIT", EVENT_EXIT, p->pid, (WIFSIGNALED(s)?-1:WEXITSTATUS(s)));
if (WIFSIGNALED(s))
{
/*
Ignore signal SIGPIPE.We issue it ourselves to the pipe
writer when the pipe reader dies.
*/
if (WTERMSIG(s) != SIGPIPE)
{
int proc_is_job = ((p==j->first_process) && (p->next == 0));
if (proc_is_job)
job_set_flag(j, JOB_NOTIFIED, 1);
if (!job_get_flag(j, JOB_SKIP_NOTIFICATION))
{
if (proc_is_job)
fwprintf(stdout,
_(L"%ls: Job %d, \'%ls\' terminated by signal %ls (%ls)"),
program_name,
j->job_id,
j->command_wcstr(),
sig2wcs(WTERMSIG(p->status)),
signal_get_desc(WTERMSIG(p->status)));
else
fwprintf(stdout,
_(L"%ls: Process %d, \'%ls\' from job %d, \'%ls\' terminated by signal %ls (%ls)"),
program_name,
p->pid,
p->argv0(),
j->job_id,
j->command_wcstr(),
sig2wcs(WTERMSIG(p->status)),
signal_get_desc(WTERMSIG(p->status)));
tputs(clr_eol,1,&writeb);
fwprintf(stdout, L"\n");
found=1;
}
/*
Clear status so it is not reported more than once
*/
p->status = 0;
}
}
}
/*
If all processes have completed, tell the user the job has
completed and delete it from the active job list.
*/
if (job_is_completed(j))
{
if (!job_get_flag(j, JOB_FOREGROUND) && !job_get_flag(j, JOB_NOTIFIED) && !job_get_flag(j, JOB_SKIP_NOTIFICATION))
{
format_job_info(j, _(L"ended"));
found=1;
}
proc_fire_event(L"JOB_EXIT", EVENT_EXIT, -j->pgid, 0);
proc_fire_event(L"JOB_EXIT", EVENT_JOB_ID, j->job_id, 0);
job_free(j);
}
else if (job_is_stopped(j) && !job_get_flag(j, JOB_NOTIFIED))
{
/*
Notify the user about newly stopped jobs.
*/
if (!job_get_flag(j, JOB_SKIP_NOTIFICATION))
{
format_job_info(j, _(L"stopped"));
found=1;
}
job_set_flag(j, JOB_NOTIFIED, 1);
}
}
if (found)
fflush(stdout);
/* Restore the exit status. */
proc_set_last_status(saved_status);
locked = 0;
return found;
}
int exec_subshell( const wchar_t *cmd,
array_list_t *lst )
{
char *begin, *end;
char z=0;
int prev_subshell = is_subshell;
int status, prev_status;
io_data_t *io_buffer;
const wchar_t *ifs;
char sep=0;
CHECK( cmd, -1 );
ifs = env_get(L"IFS");
if( ifs && ifs[0] )
{
if( ifs[0] < 128 )
{
sep = '\n';//ifs[0];
}
else
{
sep = 0;
debug( 0, L"Warning - invalid command substitution separator '%lc'. Please change the firsta character of IFS", ifs[0] );
}
}
is_subshell=1;
io_buffer= io_buffer_create( 0 );
prev_status = proc_get_last_status();
if( eval( cmd, io_buffer, SUBST ) )
{
status = -1;
}
else
{
status = proc_get_last_status();
}
io_buffer_read( io_buffer );
proc_set_last_status( prev_status );
is_subshell = prev_subshell;
b_append( io_buffer->param2.out_buffer, &z, 1 );
begin=end=io_buffer->param2.out_buffer->buff;
if( lst )
{
while( 1 )
{
if( *end == 0 )
{
if( begin != end )
{
wchar_t *el = str2wcs( begin );
if( el )
{
al_push( lst, el );
}
else
{
debug( 2, L"Got null string on line %d of file %s", __LINE__, __FILE__ );
}
}
io_buffer_destroy( io_buffer );
return status;
}
else if( *end == sep )
{
wchar_t *el;
*end=0;
el = str2wcs( begin );
if( el )
{
al_push( lst, el );
}
else
{
debug( 2, L"Got null string on line %d of file %s", __LINE__, __FILE__ );
}
begin = end+1;
}
end++;
}
}
io_buffer_destroy( io_buffer );
return status;
}
void job_continue (job_t *j, int cont)
{
/*
Put job first in the job list
*/
job_promote(j);
job_set_flag( j, JOB_NOTIFIED, 0 );
CHECK_BLOCK();
debug( 4,
L"Continue job %d, gid %d (%ls), %ls, %ls",
j->job_id,
j->pgid,
j->command_wcstr(),
job_is_completed( j )?L"COMPLETED":L"UNCOMPLETED",
is_interactive?L"INTERACTIVE":L"NON-INTERACTIVE" );
if( !job_is_completed( j ) )
{
if( job_get_flag( j, JOB_TERMINAL ) && job_get_flag( j, JOB_FOREGROUND ) )
{
/* Put the job into the foreground. */
int ok;
signal_block();
ok = terminal_give_to_job( j, cont );
signal_unblock();
if( !ok )
return;
}
/*
Send the job a continue signal, if necessary.
*/
if( cont )
{
process_t *p;
for( p=j->first_process; p; p=p->next )
p->stopped=0;
if( job_get_flag( j, JOB_CONTROL ) )
{
if( killpg( j->pgid, SIGCONT ) )
{
wperror( L"killpg (SIGCONT)" );
return;
}
}
else
{
for( p=j->first_process; p; p=p->next )
{
if (kill ( p->pid, SIGCONT) < 0)
{
wperror (L"kill (SIGCONT)");
return;
}
}
}
}
if( job_get_flag( j, JOB_FOREGROUND ) )
{
int quit = 0;
/*
Wait for job to report. Looks a bit ugly because it has to
handle the possibility that a signal is dispatched while
running job_is_stopped().
*/
while( !quit )
{
do
{
got_signal = 0;
quit = job_is_stopped( j ) || job_is_completed( j );
}
while (got_signal && !quit);
if (quit) {
// It's possible that the job will produce output and exit before we've even read from it.
// We'll eventually read the output, but it may be after we've executed subsequent calls
// This is why my prompt colors kept getting screwed up - the builtin echo calls
// were sometimes having their output combined with the set_color calls in the wrong order!
read_try(j);
}
if( !quit )
{
// debug( 1, L"select_try()" );
switch( select_try(j) )
{
case 1:
{
read_try( j );
break;
}
case -1:
{
/*
If there is no funky IO magic, we can use
waitpid instead of handling child deaths
through signals. This gives a rather large
speed boost (A factor 3 startup time
improvement on my 300 MHz machine) on
short-lived jobs.
*/
int status;
pid_t pid = waitpid(-1, &status, WUNTRACED );
if( pid > 0 )
{
handle_child_status( pid, status );
}
else
{
/*
This probably means we got a
signal. A signal might mean that the
terminal emulator sent us a hup
signal to tell is to close. If so,
we should exit.
*/
if( reader_exit_forced() )
{
quit = 1;
}
}
break;
}
}
}
}
}
}
if( job_get_flag( j, JOB_FOREGROUND ) )
{
if( job_is_completed( j ))
{
process_t *p = j->first_process;
while( p->next )
p = p->next;
if( WIFEXITED( p->status ) || WIFSIGNALED(p->status))
{
/*
Mark process status only if we are in the foreground
and the last process in a pipe, and it is not a short circuted builtin
*/
if( p->pid )
{
int status = proc_format_status(p->status);
//wprintf(L"setting status %d for %ls\n", job_get_flag( j, JOB_NEGATE )?!status:status, j->command);
proc_set_last_status( job_get_flag( j, JOB_NEGATE )?!status:status);
}
}
}
/*
Put the shell back in the foreground.
*/
if( job_get_flag( j, JOB_TERMINAL ) && job_get_flag( j, JOB_FOREGROUND ) )
{
int ok;
signal_block();
ok = terminal_return_from_job( j );
signal_unblock();
if( !ok )
return;
}
}
}
/**
Perform the specified event. Since almost all event firings will
not be matched by even a single event handler, we make sure to
optimize the 'no matches' path. This means that nothing is
allocated/initialized unless needed.
*/
static void event_fire_internal(const event_t *event)
{
size_t i, j;
event_list_t fire;
/*
First we free all events that have been removed
*/
event_free_kills();
if (events.empty())
return;
/*
Then we iterate over all events, adding events that should be
fired to a second list. We need to do this in a separate step
since an event handler might call event_remove or
event_add_handler, which will change the contents of the \c
events list.
*/
for (i=0; i<events.size(); i++)
{
event_t *criterion = events.at(i);
/*
Check if this event is a match
*/
if (event_match(criterion, event))
{
fire.push_back(criterion);
}
}
/*
No matches. Time to return.
*/
if (fire.empty())
return;
/*
Iterate over our list of matching events
*/
for (i=0; i<fire.size(); i++)
{
event_t *criterion = fire.at(i);
int prev_status;
/*
Check if this event has been removed, if so, dont fire it
*/
if (event_is_killed(criterion))
continue;
/*
Fire event
*/
wcstring buffer = criterion->function_name;
if (event->arguments.get())
{
for (j=0; j< event->arguments->size(); j++)
{
wcstring arg_esc = escape_string(event->arguments->at(j), 1);
buffer += L" ";
buffer += arg_esc;
}
}
// debug( 1, L"Event handler fires command '%ls'", buffer.c_str() );
/*
Event handlers are not part of the main flow of code, so
they are marked as non-interactive
*/
proc_push_interactive(0);
prev_status = proc_get_last_status();
parser_t &parser = parser_t::principal_parser();
block_t *block = new event_block_t(event);
parser.push_block(block);
parser.eval(buffer, io_chain_t(), TOP);
parser.pop_block();
proc_pop_interactive();
proc_set_last_status(prev_status);
}
/*
Free killed events
*/
event_free_kills();
}
