/*
* Note that 'init' is a special process: it doesn't get signals it doesn't
* want to handle. Thus you cannot kill init even with a SIGKILL even by
* mistake.
*
* Note that we go through the signals twice: once to check the signals that
* the kernel can handle, and then we build all the user-level signal handling
* stack-frames in one go after that.
*/
static void do_signal(struct pt_regs *regs, int in_syscall)
{
struct ksignal ksig;
#ifdef DEBUG_SIG
pr_info("do signal: %p %d\n", regs, in_syscall);
pr_info("do signal2: %lx %lx %ld [%lx]\n", regs->pc, regs->r1,
regs->r12, current_thread_info()->flags);
#endif
if (get_signal(&ksig)) {
/* Whee! Actually deliver the signal. */
if (in_syscall)
handle_restart(regs, &ksig.ka, 1);
handle_signal(&ksig, regs);
return;
}
if (in_syscall)
handle_restart(regs, NULL, 0);
/*
* If there's no signal to deliver, we just put the saved sigmask
* back.
*/
restore_saved_sigmask();
}
/*
* Note that 'init' is a special process: it doesn't get signals it doesn't
* want to handle. Thus you cannot kill init even with a SIGKILL even by
* mistake.
*
* Note that we go through the signals twice: once to check the signals that
* the kernel can handle, and then we build all the user-level signal handling
* stack-frames in one go after that.
*/
static void do_signal(struct pt_regs *regs, int in_syscall)
{
siginfo_t info;
int signr;
struct k_sigaction ka;
#ifdef DEBUG_SIG
pr_info("do signal: %p %d\n", regs, in_syscall);
pr_info("do signal2: %lx %lx %ld [%lx]\n", regs->pc, regs->r1,
regs->r12, current_thread_info()->flags);
#endif
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
if (signr > 0) {
/* Whee! Actually deliver the signal. */
if (in_syscall)
handle_restart(regs, &ka, 1);
handle_signal(signr, &ka, &info, regs);
return;
}
if (in_syscall)
handle_restart(regs, NULL, 0);
/*
* If there's no signal to deliver, we just put the saved sigmask
* back.
*/
restore_saved_sigmask();
}
/*
* OK, we're invoking a handler
*/
static int
handle_signal(int sig, siginfo_t *info, struct k_sigaction *ka,
sigset_t *oldset, struct pt_regs *regs)
{
int ret;
/* are we from a system call? to see pt_regs->orig_p0 */
if (regs->orig_p0 >= 0)
/* If so, check system call restarting.. */
handle_restart(regs, ka, 1);
/* set up the stack frame */
ret = setup_rt_frame(sig, ka, info, oldset, regs);
if (ret == 0) {
spin_lock_irq(¤t->sighand->siglock);
sigorsets(¤t->blocked, ¤t->blocked,
&ka->sa.sa_mask);
if (!(ka->sa.sa_flags & SA_NODEFER))
sigaddset(¤t->blocked, sig);
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
}
return ret;
}
/*
* Note that 'init' is a special process: it doesn't get signals it doesn't
* want to handle. Thus you cannot kill init even with a SIGKILL even by
* mistake.
*/
asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs)
{
struct k_sigaction ka;
siginfo_t info;
int signr;
/*
* We want the common case to go fast, which
* is why we may in certain cases get here from
* kernel mode. Just return without doing anything
* if so.
*/
if (!user_mode(regs))
return 1;
if (!oldset)
oldset = ¤t->blocked;
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
if (signr > 0) {
/* Whee! Actually deliver the signal. */
handle_signal(signr, &ka, &info, oldset, regs);
return 1;
}
/* Did we come from a system call? */
if (regs->frame_type == -1) {
/* Restart the system call - no handlers present */
handle_restart(regs, NULL, 0);
}
return 0;
}
/*
* OK, we're invoking a handler
*/
static void
handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
sigset_t *oldset, struct pt_regs *regs)
{
/* are we from a system call? */
if (regs->orig_er0 >= 0)
/* If so, check system call restarting.. */
handle_restart(regs, ka, 1);
/* set up the stack frame */
if (ka->sa.sa_flags & SA_SIGINFO)
setup_rt_frame(sig, ka, info, oldset, regs);
else
setup_frame(sig, ka, oldset, regs);
if (ka->sa.sa_flags & SA_ONESHOT)
ka->sa.sa_handler = SIG_DFL;
if (!(ka->sa.sa_flags & SA_NODEFER)) {
spin_lock_irq(¤t->sighand->siglock);
sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
sigaddset(¤t->blocked,sig);
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
}
}
/*
* OK, we're invoking a handler
*/
static void
handle_signal(struct ksignal *ksig, struct pt_regs *regs)
{
sigset_t *oldset = sigmask_to_save();
int ret;
/* are we from a system call? */
if (regs->orig_er0 >= 0)
handle_restart(regs, &ksig->ka);
ret = setup_rt_frame(ksig, oldset, regs);
signal_setup_done(ret, ksig, 0);
}
/*
* Note that 'init' is a special process: it doesn't get signals it doesn't
* want to handle. Thus you cannot kill init even with a SIGKILL even by
* mistake.
*
* Note that we go through the signals twice: once to check the signals that
* the kernel can handle, and then we build all the user-level signal handling
* stack-frames in one go after that.
*/
int do_signal(struct pt_regs *regs, sigset_t *oldset, int in_syscall)
{
siginfo_t info;
int signr;
struct k_sigaction ka;
#ifdef DEBUG_SIG
printk(KERN_INFO "do signal: %p %p %d\n", regs, oldset, in_syscall);
printk(KERN_INFO "do signal2: %lx %lx %ld [%lx]\n", regs->pc, regs->r1,
regs->r12, current_thread_info()->flags);
#endif
/*
* We want the common case to go fast, which
* is why we may in certain cases get here from
* kernel mode. Just return without doing anything
* if so.
*/
if (kernel_mode(regs))
return 1;
if (!oldset)
oldset = ¤t->blocked;
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
if (signr > 0) {
/* Whee! Actually deliver the signal. */
if (in_syscall)
handle_restart(regs, &ka, 1);
handle_signal(signr, &ka, &info, oldset, regs);
return 1;
}
if (in_syscall)
handle_restart(regs, NULL, 0);
/* Did we come from a system call? */
return 0;
}
/*
* Note that 'init' is a special process: it doesn't get signals it doesn't
* want to handle. Thus you cannot kill init even with a SIGKILL even by
* mistake.
*
* Note that we go through the signals twice: once to check the signals
* that the kernel can handle, and then we build all the user-level signal
* handling stack-frames in one go after that.
*/
asmlinkage void do_signal(struct pt_regs *regs)
{
siginfo_t info;
int signr;
struct k_sigaction ka;
sigset_t *oldset;
current->thread.esp0 = (unsigned long)regs;
if (try_to_freeze())
goto no_signal;
if (test_thread_flag(TIF_RESTORE_SIGMASK))
oldset = ¤t->saved_sigmask;
else
oldset = ¤t->blocked;
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
if (signr > 0) {
/* Whee! Actually deliver the signal. */
if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
/* a signal was successfully delivered; the saved
* sigmask will have been stored in the signal frame,
* and will be restored by sigreturn, so we can simply
* clear the TIF_RESTORE_SIGMASK flag */
if (test_thread_flag(TIF_RESTORE_SIGMASK))
clear_thread_flag(TIF_RESTORE_SIGMASK);
tracehook_signal_handler(signr, &info, &ka, regs,
test_thread_flag(TIF_SINGLESTEP));
}
return;
}
no_signal:
/* Did we come from a system call? */
if (regs->orig_p0 >= 0)
/* Restart the system call - no handlers present */
handle_restart(regs, NULL, 0);
/* if there's no signal to deliver, we just put the saved sigmask
* back */
if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
clear_thread_flag(TIF_RESTORE_SIGMASK);
sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
}
}
/*
* OK, we're invoking a handler
*/
static void
handle_signal(int sig, siginfo_t *info, struct k_sigaction *ka,
struct pt_regs *regs)
{
/* are we from a system call? to see pt_regs->orig_p0 */
if (regs->orig_p0 >= 0)
/* If so, check system call restarting.. */
handle_restart(regs, ka, 1);
/* set up the stack frame */
if (setup_rt_frame(sig, ka, info, sigmask_to_save(), regs) < 0)
force_sigsegv(sig, current);
else
signal_delivered(sig, info, ka, regs,
test_thread_flag(TIF_SINGLESTEP));
}
/*
* Note that 'init' is a special process: it doesn't get signals it doesn't
* want to handle. Thus you cannot kill init even with a SIGKILL even by
* mistake.
*/
static void do_signal(struct pt_regs *regs)
{
struct ksignal ksig;
current->thread.esp0 = (unsigned long) regs;
if (get_signal(&ksig)) {
/* Whee! Actually deliver the signal. */
handle_signal(&ksig, regs);
return;
}
/* Did we come from a system call? */
if (regs->orig_er0 >= 0)
handle_restart(regs, NULL);
/* If there's no signal to deliver, we just restore the saved mask. */
restore_saved_sigmask();
}
/*
* OK, we're invoking a handler
*/
static int
handle_signal(int sig, siginfo_t *info, struct k_sigaction *ka,
sigset_t *oldset, struct pt_regs *regs)
{
int ret;
/* are we from a system call? to see pt_regs->orig_p0 */
if (regs->orig_p0 >= 0)
/* If so, check system call restarting.. */
handle_restart(regs, ka, 1);
/* set up the stack frame */
ret = setup_rt_frame(sig, ka, info, oldset, regs);
if (ret == 0)
block_sigmask(ka, sig);
return ret;
}
/*
* Note that 'init' is a special process: it doesn't get signals it doesn't
* want to handle. Thus you cannot kill init even with a SIGKILL even by
* mistake.
*
* Note that we go through the signals twice: once to check the signals
* that the kernel can handle, and then we build all the user-level signal
* handling stack-frames in one go after that.
*/
asmlinkage void do_signal(struct pt_regs *regs)
{
siginfo_t info;
int signr;
struct k_sigaction ka;
current->thread.esp0 = (unsigned long)regs;
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
if (signr > 0) {
/* Whee! Actually deliver the signal. */
handle_signal(signr, &info, &ka, regs);
return;
}
/* Did we come from a system call? */
if (regs->orig_p0 >= 0)
/* Restart the system call - no handlers present */
handle_restart(regs, NULL, 0);
/* if there's no signal to deliver, we just put the saved sigmask
* back */
restore_saved_sigmask();
}
int
do_test (int argc, char *argv[])
{
pid_t pid;
int status;
/* We must have
- one or four parameters left if called initially
+ path for ld.so optional
+ "--library-path" optional
+ the library path optional
+ the application name
if --enable-hardcoded-path-in-tests is used, just
+ the application name
*/
if (restart)
{
if (argc != 1)
{
printf ("Wrong number of arguments (%d) in restart\n", argc);
exit (EXIT_FAILURE);
}
return handle_restart ();
}
if (argc != 2 && argc != 5)
{
printf ("Wrong number of arguments (%d)\n", argc);
exit (EXIT_FAILURE);
}
/* We want to test the `execvpe' function. To do this we restart the
program with an additional parameter. */
pid = fork ();
if (pid == 0)
{
/* This is the child. Construct the command line. */
/* We cast here to char* because the test itself does not modify neither
the argument nor the environment list. */
char *envs[] = { (char*)(EXECVPE_KEY "=" EXECVPE_VALUE), NULL };
if (argc == 5)
{
char *args[] = { argv[1], argv[2], argv[3], argv[4],
(char *) "--direct", (char *) "--restart", NULL };
execvpe (args[0], args, envs);
}
else
{
char *args[] = { argv[0],
(char *) "--direct", (char *) "--restart", NULL };
execvpe (args[0], args, envs);
}
puts ("Cannot exec");
exit (EXIT_FAILURE);
}
else if (pid == (pid_t) -1)
{
puts ("Cannot fork");
return 1;
}
/* Wait for the child. */
if (waitpid (pid, &status, 0) != pid)
{
puts ("Wrong child");
return 1;
}
if (WTERMSIG (status) != 0)
{
puts ("Child terminated incorrectly");
return 1;
}
status = WEXITSTATUS (status);
return status;
}
int
do_test (int argc, char *argv[])
{
pid_t pid;
int fd1;
int fd2;
int flags;
int status;
/* We must have
- one or four parameters left if called initially
+ path for ld.so optional
+ "--library-path" optional
+ the library path optional
+ the application name
- three parameters left if called through re-execution
+ file descriptor number which is supposed to be closed
+ the open file descriptor
+ the name of the closed desriptor
*/
if (restart)
{
if (argc != 4)
error (EXIT_FAILURE, 0, "wrong number of arguments (%d)", argc);
return handle_restart (argv[1], argv[2], argv[3]);
}
if (argc != 2 && argc != 5)
error (EXIT_FAILURE, 0, "wrong number of arguments (%d)", argc);
/* Prepare the test. We are creating two files: one which file descriptor
will be marked with FD_CLOEXEC, another which is not. */
/* Open our test files. */
fd1 = mkstemp (name1);
if (fd1 == -1)
error (EXIT_FAILURE, errno, "cannot open test file `%s'", name1);
fd2 = mkstemp (name2);
if (fd2 == -1)
error (EXIT_FAILURE, errno, "cannot open test file `%s'", name2);
/* Set the bit. */
flags = fcntl (fd1, F_GETFD, 0);
if (flags < 0)
error (EXIT_FAILURE, errno, "cannot get flags");
flags |= FD_CLOEXEC;
if (fcntl (fd1, F_SETFD, flags) < 0)
error (EXIT_FAILURE, errno, "cannot set flags");
/* Write something in the files. */
if (write (fd1, fd1string, strlen (fd1string)) != strlen (fd1string))
error (EXIT_FAILURE, errno, "cannot write to first file");
if (write (fd2, fd2string, strlen (fd2string)) != strlen (fd2string))
error (EXIT_FAILURE, errno, "cannot write to second file");
/* We want to test the `exec' function. To do this we restart the program
with an additional parameter. But first create another process. */
pid = fork ();
if (pid == 0)
{
char fd1name[18];
char fd2name[18];
snprintf (fd1name, sizeof fd1name, "%d", fd1);
snprintf (fd2name, sizeof fd2name, "%d", fd2);
/* This is the child. Construct the command line. */
if (argc == 5)
execl (argv[1], argv[1], argv[2], argv[3], argv[4], "--direct",
"--restart", fd1name, fd2name, name1, NULL);
else
execl (argv[1], argv[1], "--direct",
"--restart", fd1name, fd2name, name1, NULL);
error (EXIT_FAILURE, errno, "cannot exec");
}
else if (pid == (pid_t) -1)
error (EXIT_FAILURE, errno, "cannot fork");
/* Wait for the child. */
if (waitpid (pid, &status, 0) != pid)
error (EXIT_FAILURE, errno, "wrong child");
if (WTERMSIG (status) != 0)
error (EXIT_FAILURE, 0, "Child terminated incorrectly");
status = WEXITSTATUS (status);
/* Remove the test files. */
unlink (name1);
unlink (name2);
return status;
}
int
do_test (int argc, char *argv[])
{
pid_t pid;
int fd1;
int fd2;
int fd3;
int fd4;
int status;
posix_spawn_file_actions_t actions;
char fd1name[18];
char fd2name[18];
char fd3name[18];
char fd4name[18];
char *spargv[12];
/* We must have
- four parameters left of called initially
+ path for ld.so
+ "--library-path"
+ the library path
+ the application name
- five parameters left if called through re-execution
+ file descriptor number which is supposed to be closed
+ the open file descriptor
+ the newly opened file descriptor
+ thhe duped second descriptor
+ the name of the closed descriptor
*/
if (argc != (restart ? 6 : 5))
error (EXIT_FAILURE, 0, "wrong number of arguments (%d)", argc);
if (restart)
return handle_restart (argv[1], argv[2], argv[3], argv[4], argv[5]);
/* Prepare the test. We are creating two files: one which file descriptor
will be marked with FD_CLOEXEC, another which is not. */
/* Open our test files. */
fd1 = mkstemp (name1);
if (fd1 == -1)
error (EXIT_FAILURE, errno, "cannot open test file `%s'", name1);
fd2 = mkstemp (name2);
if (fd2 == -1)
error (EXIT_FAILURE, errno, "cannot open test file `%s'", name2);
fd3 = mkstemp (name3);
if (fd3 == -1)
error (EXIT_FAILURE, errno, "cannot open test file `%s'", name3);
/* Write something in the files. */
if (write (fd1, fd1string, strlen (fd1string)) != strlen (fd1string))
error (EXIT_FAILURE, errno, "cannot write to first file");
if (write (fd2, fd2string, strlen (fd2string)) != strlen (fd2string))
error (EXIT_FAILURE, errno, "cannot write to second file");
if (write (fd3, fd3string, strlen (fd3string)) != strlen (fd3string))
error (EXIT_FAILURE, errno, "cannot write to third file");
/* Close the third file. It'll be opened by `spawn'. */
close (fd3);
/* Tell `spawn' what to do. */
if (posix_spawn_file_actions_init (&actions) != 0)
error (EXIT_FAILURE, errno, "posix_spawn_file_actions_init");
/* Close `fd1'. */
if (posix_spawn_file_actions_addclose (&actions, fd1) != 0)
error (EXIT_FAILURE, errno, "posix_spawn_file_actions_addclose");
/* We want to open the third file. */
if (posix_spawn_file_actions_addopen (&actions, fd3, name3,
O_RDONLY, 0666) != 0)
error (EXIT_FAILURE, errno, "posix_spawn_file_actions_addopen");
/* We dup the second descriptor. */
fd4 = MAX (2, MAX (fd1, MAX (fd2, fd3))) + 1;
if (posix_spawn_file_actions_adddup2 (&actions, fd2, fd4) != 0)
error (EXIT_FAILURE, errno, "posix_spawn_file_actions_adddup2");
/* Now spawn the process. */
snprintf (fd1name, sizeof fd1name, "%d", fd1);
snprintf (fd2name, sizeof fd2name, "%d", fd2);
snprintf (fd3name, sizeof fd3name, "%d", fd3);
snprintf (fd4name, sizeof fd4name, "%d", fd4);
spargv[0] = argv[1];
spargv[1] = argv[2];
spargv[2] = argv[3];
spargv[3] = argv[4];
spargv[4] = (char *) "--direct";
spargv[5] = (char *) "--restart";
spargv[6] = fd1name;
spargv[7] = fd2name;
spargv[8] = fd3name;
spargv[9] = fd4name;
spargv[10] = name1;
spargv[11] = NULL;
if (posix_spawn (&pid, argv[1], &actions, NULL, spargv, environ) != 0)
error (EXIT_FAILURE, errno, "posix_spawn");
/* Cleanup. */
if (posix_spawn_file_actions_destroy (&actions) != 0)
error (EXIT_FAILURE, errno, "posix_spawn_file_actions_destroy");
/* Wait for the child. */
if (waitpid (pid, &status, 0) != pid)
error (EXIT_FAILURE, errno, "wrong child");
if (WTERMSIG (status) != 0)
error (EXIT_FAILURE, 0, "Child terminated incorrectly");
status = WEXITSTATUS (status);
/* Remove the test files. */
unlink (name1);
unlink (name2);
unlink (name3);
return status;
}
/*
* Note that 'init' is a special process: it doesn't get signals it doesn't
* want to handle. Thus you cannot kill init even with a SIGKILL even by
* mistake.
*
* Note that we go through the signals twice: once to check the signals
* that the kernel can handle, and then we build all the user-level signal
* handling stack-frames in one go after that.
*/
asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs)
{
siginfo_t info;
struct k_sigaction *ka;
current->thread.esp0 = (unsigned long) regs;
if (!oldset)
oldset = ¤t->blocked;
for (;;) {
int signr;
signr = get_signal_to_deliver(&info, regs, NULL);
if (!signr)
break;
if ((current->ptrace & PT_PTRACED) && signr != SIGKILL) {
current->exit_code = signr;
current->state = TASK_STOPPED;
/* Did we come from a system call? */
if (regs->orig_er0 >= 0) {
/* Restart the system call the same way as
if the process were not traced. */
struct k_sigaction *ka =
¤t->sighand->action[signr-1];
int has_handler =
(ka->sa.sa_handler != SIG_IGN &&
ka->sa.sa_handler != SIG_DFL);
handle_restart(regs, ka, has_handler);
}
notify_parent(current, SIGCHLD);
schedule();
/* We're back. Did the debugger cancel the sig? */
if (!(signr = current->exit_code)) {
discard_frame:
continue;
}
current->exit_code = 0;
/* The debugger continued. Ignore SIGSTOP. */
if (signr == SIGSTOP)
goto discard_frame;
/* Update the siginfo structure. Is this good? */
if (signr != info.si_signo) {
info.si_signo = signr;
info.si_errno = 0;
info.si_code = SI_USER;
info.si_pid = current->parent->pid;
info.si_uid = current->parent->uid;
}
/* If the (new) signal is now blocked, requeue it. */
if (sigismember(¤t->blocked, signr)) {
send_sig_info(signr, &info, current);
continue;
}
}
ka = ¤t->sighand->action[signr-1];
if (ka->sa.sa_handler == SIG_IGN) {
if (signr != SIGCHLD)
continue;
/* Check for SIGCHLD: it's special. */
while (sys_wait4(-1, NULL, WNOHANG, NULL) > 0)
/* nothing */;
continue;
}
if (ka->sa.sa_handler == SIG_DFL) {
int exit_code = signr;
if (current->pid == 1)
continue;
switch (signr) {
case SIGCONT: case SIGCHLD:
case SIGWINCH: case SIGURG:
continue;
case SIGTSTP: case SIGTTIN: case SIGTTOU:
if (is_orphaned_pgrp(process_group(current)))
continue;
/* FALLTHRU */
case SIGSTOP: {
struct sighand_struct *sig;
current->state = TASK_STOPPED;
current->exit_code = signr;
sig = current->parent->sighand;
if (sig && !(sig->action[SIGCHLD-1].sa.sa_flags
& SA_NOCLDSTOP))
notify_parent(current, SIGCHLD);
schedule();
continue;
}
case SIGQUIT: case SIGILL: case SIGTRAP:
case SIGIOT: case SIGFPE: case SIGSEGV:
case SIGBUS: case SIGSYS: case SIGXCPU: case SIGXFSZ:
if (do_coredump(signr, exit_code, regs))
exit_code |= 0x80;
/* FALLTHRU */
default:
sigaddset(¤t->pending.signal, signr);
recalc_sigpending();
current->flags |= PF_SIGNALED;
do_exit(exit_code);
/* NOTREACHED */
}
}
/* Whee! Actually deliver the signal. */
handle_signal(signr, ka, &info, oldset, regs);
return 1;
}
/* Did we come from a system call? */
if (regs->orig_er0 >= 0)
/* Restart the system call - no handlers present */
handle_restart(regs, NULL, 0);
return 0;
}
