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authorRoland McGrath <roland@redhat.com>2008-07-25 22:46:00 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-26 15:00:10 -0400
commitebcb67341fee34061430f3367f2e507e52ee051b (patch)
treec6790a014ead7c6432178aa2a0dac7eb41c25b40 /fs/proc
parentbbc698636ed48b6fcd323964e0f847a6a796325d (diff)
/proc/PID/syscall
This adds /proc/PID/syscall and /proc/PID/task/TID/syscall magic files. These use task_current_syscall() to show the task's current system call number and argument registers, stack pointer and PC. For a task blocked but not in a syscall, the file shows "-1" in place of the syscall number, followed by only the SP and PC. For a task that's not blocked, it shows "running". Signed-off-by: Roland McGrath <roland@redhat.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Reviewed-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/proc')
-rw-r--r--fs/proc/base.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 4b74dba69a6d..81bce6791bfc 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -509,6 +509,26 @@ static int proc_pid_limits(struct task_struct *task, char *buffer)
509 return count; 509 return count;
510} 510}
511 511
512#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
513static int proc_pid_syscall(struct task_struct *task, char *buffer)
514{
515 long nr;
516 unsigned long args[6], sp, pc;
517
518 if (task_current_syscall(task, &nr, args, 6, &sp, &pc))
519 return sprintf(buffer, "running\n");
520
521 if (nr < 0)
522 return sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc);
523
524 return sprintf(buffer,
525 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
526 nr,
527 args[0], args[1], args[2], args[3], args[4], args[5],
528 sp, pc);
529}
530#endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
531
512/************************************************************************/ 532/************************************************************************/
513/* Here the fs part begins */ 533/* Here the fs part begins */
514/************************************************************************/ 534/************************************************************************/
@@ -2478,6 +2498,9 @@ static const struct pid_entry tgid_base_stuff[] = {
2478#ifdef CONFIG_SCHED_DEBUG 2498#ifdef CONFIG_SCHED_DEBUG
2479 REG("sched", S_IRUGO|S_IWUSR, pid_sched), 2499 REG("sched", S_IRUGO|S_IWUSR, pid_sched),
2480#endif 2500#endif
2501#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
2502 INF("syscall", S_IRUSR, pid_syscall),
2503#endif
2481 INF("cmdline", S_IRUGO, pid_cmdline), 2504 INF("cmdline", S_IRUGO, pid_cmdline),
2482 ONE("stat", S_IRUGO, tgid_stat), 2505 ONE("stat", S_IRUGO, tgid_stat),
2483 ONE("statm", S_IRUGO, pid_statm), 2506 ONE("statm", S_IRUGO, pid_statm),
@@ -2810,6 +2833,9 @@ static const struct pid_entry tid_base_stuff[] = {
2810#ifdef CONFIG_SCHED_DEBUG 2833#ifdef CONFIG_SCHED_DEBUG
2811 REG("sched", S_IRUGO|S_IWUSR, pid_sched), 2834 REG("sched", S_IRUGO|S_IWUSR, pid_sched),
2812#endif 2835#endif
2836#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
2837 INF("syscall", S_IRUSR, pid_syscall),
2838#endif
2813 INF("cmdline", S_IRUGO, pid_cmdline), 2839 INF("cmdline", S_IRUGO, pid_cmdline),
2814 ONE("stat", S_IRUGO, tid_stat), 2840 ONE("stat", S_IRUGO, tid_stat),
2815 ONE("statm", S_IRUGO, pid_statm), 2841 ONE("statm", S_IRUGO, pid_statm),