/* run_pipe_real() starts all the jobs, but doesn't wait for anything
* to finish. See checkjobs().
*
* return code is normally -1, when the caller has to wait for children
* to finish to determine the exit status of the pipe. If the pipe
* is a simple builtin command, however, the action is done by the
* time run_pipe_real returns, and the exit code is provided as the
* return value.
*
* The input of the pipe is always stdin, the output is always
* stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
* because it tries to avoid running the command substitution in
* subshell, when that is in fact necessary. The subshell process
* now has its stdout directed to the input of the appropriate pipe,
* so this routine is noticeably simpler.
*/
static int run_pipe_real(struct pipe *pi) {
int i;
int nextin;
int flag = do_repeat ? CMD_FLAG_REPEAT : 0;
struct child_prog *child;
cmd_tbl_t *cmdtp;
char *p;
# if __GNUC__
/* Avoid longjmp clobbering */
(void) &i;
(void) &nextin;
(void) &child;
# endif
nextin = 0;
/* Check if this is a simple builtin (not part of a pipe).
* Builtins within pipes have to fork anyway, and are handled in
* pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
*/
if (pi->num_progs == 1)
child = &(pi->progs[0]);
if (pi->num_progs == 1 && child->group) {
int rcode;
debug_printf("non-subshell grouping\n");
rcode = run_list_real(child->group);
return rcode;
} else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
for (i = 0; is_assignment(child->argv[i]); i++) { /* nothing */
}
if (i != 0 && child->argv[i] == NULL) {
/* assignments, but no command: set the local environment */
for (i = 0; child->argv[i] != NULL; i++) {
/* Ok, this case is tricky. We have to decide if this is a
* local variable, or an already exported variable. If it is
* already exported, we have to export the new value. If it is
* not exported, we need only set this as a local variable.
* This junk is all to decide whether or not to export this
* variable. */
int export_me = 0;
char *name, *value;
name = xstrdup(child->argv[i]);
debug_printf("Local environment set: %s\n", name);
value = strchr(name, '=');
if (value)
*value = 0;
free(name);
p = insert_var_value(child->argv[i]);
set_local_var(p, export_me);
if (p != child->argv[i])
free(p);
}
return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
}
for (i = 0; is_assignment(child->argv[i]); i++) {
p = insert_var_value(child->argv[i]);
set_local_var(p, 0);
if (p != child->argv[i]) {
child->sp--;
free(p);
}
}
if (child->sp) {
char * str = NULL;
str = make_string((child->argv + i));
parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
free(str);
return last_return_code;
}
/* check ";", because ,example , argv consist from
* "help;flinfo" must not execute
*/
if (strchr(child->argv[i], ';')) {
printf_err("unknown command '%s' - try 'help' or use 'run' command\n", child->argv[i]);
return -1;
}
/* Look up command in command table */
if ((cmdtp = find_cmd(child->argv[i])) == NULL) {
printf_err("unknown command '%s' - try 'help'\n", child->argv[i]);
return -1; /* give up after bad command */
} else {
int rcode;
#if defined(CONFIG_CMD_BOOTD)
extern int do_bootd (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
/* avoid "bootd" recursion */
if (cmdtp->cmd == do_bootd) {
if (flag & CMD_FLAG_BOOTD) {
printf_err("'bootd' recursion detected!\n");
return -1;
} else {
flag |= CMD_FLAG_BOOTD;
}
}
#endif /* CONFIG_CMD_BOOTD */
/* found - check max args */
if ((child->argc - i) > cmdtp->maxargs) {
print_cmd_help(cmdtp);
return -1;
}
child->argv += i; /* XXX horrible hack */
/* OK - call function to do the command */
rcode = (cmdtp->cmd)(cmdtp, flag, child->argc - i, &child->argv[i]);
if (!cmdtp->repeatable)
flag_repeat = 0;
child->argv -= i; /* XXX restore hack so free() can work right */
return rcode;
}
}
return -1;
}
/* run_pipe_real() starts all the jobs, but doesn't wait for anything
* to finish. See checkjobs().
*
* return code is normally -1, when the caller has to wait for children
* to finish to determine the exit status of the pipe. If the pipe
* is a simple builtin command, however, the action is done by the
* time run_pipe_real returns, and the exit code is provided as the
* return value.
*
* The input of the pipe is always stdin, the output is always
* stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
* because it tries to avoid running the command substitution in
* subshell, when that is in fact necessary. The subshell process
* now has its stdout directed to the input of the appropriate pipe,
* so this routine is noticeably simpler.
*/
static int run_pipe_real(struct pipe *pi)
{
int i;
int nextin;
int flag = do_repeat ? CMD_FLAG_REPEAT : 0;
struct child_prog *child;
char *p;
#if __GNUC__
/* Avoid longjmp clobbering */
(void) &i;
(void) &nextin;
(void) &child;
#endif
nextin = 0;
/* Check if this is a simple builtin (not part of a pipe).
* Builtins within pipes have to fork anyway, and are handled in
* pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
*/
if (pi->num_progs == 1) child = & (pi->progs[0]);
if (pi->num_progs == 1 && child->group) {
int rcode;
debug_printf("non-subshell grouping\n");
rcode = run_list_real(child->group);
return rcode;
} else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ }
if (i!=0 && child->argv[i]==NULL) {
/* assignments, but no command: set the local environment */
for (i=0; child->argv[i]!=NULL; i++) {
/* Ok, this case is tricky. We have to decide if this is a
* local variable, or an already exported variable. If it is
* already exported, we have to export the new value. If it is
* not exported, we need only set this as a local variable.
* This junk is all to decide whether or not to export this
* variable. */
int export_me=0;
char *name, *value;
name = xstrdup(child->argv[i]);
debug_printf("Local environment set: %s\n", name);
value = strchr(name, '=');
if (value)
*value=0;
free(name);
p = insert_var_value(child->argv[i]);
set_local_var(p, export_me);
if (p != child->argv[i]) free(p);
}
return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
}
for (i = 0; is_assignment(child->argv[i]); i++) {
p = insert_var_value(child->argv[i]);
set_local_var(p, 0);
if (p != child->argv[i]) {
child->sp--;
free(p);
}
}
if (child->sp) {
char * str = NULL;
str = make_string((child->argv + i));
parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
free(str);
return last_return_code;
}
/* check ";", because ,example , argv consist from
* "help;flinfo" must not execute
*/
if (strchr(child->argv[i], ';')) {
printf("Unknown command '%s' - try 'help' or use "
"'run' command\n", child->argv[i]);
return -1;
}
/* Process the command */
return cmd_process(flag, child->argc, child->argv,
&flag_repeat, NULL);
}
return -1;
}
