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Commit ebcb6734 authored by Roland McGrath's avatar Roland McGrath Committed by Linus Torvalds
Browse files

/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: default avatarRoland McGrath <roland@redhat.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Reviewed-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent bbc69863

fs/proc/base.c

+26 −0
Original line number Original line Diff line number Diff line
@@ -509,6 +509,26 @@ static int proc_pid_limits(struct task_struct *task, char *buffer) 
	return count;

	return count;

}

}





#ifdef CONFIG_HAVE_ARCH_TRACEHOOK

static int proc_pid_syscall(struct task_struct *task, char *buffer)

{

	long nr;

	unsigned long args[6], sp, pc;



	if (task_current_syscall(task, &nr, args, 6, &sp, &pc))

		return sprintf(buffer, "running\n");



	if (nr < 0)

		return sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc);



	return sprintf(buffer,

		       "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",

		       nr,

		       args[0], args[1], args[2], args[3], args[4], args[5],

		       sp, pc);

}

#endif /* CONFIG_HAVE_ARCH_TRACEHOOK */



/************************************************************************/

/************************************************************************/

/*                       Here the fs part begins                        */

/*                       Here the fs part begins                        */

/************************************************************************/

/************************************************************************/
@@ -2477,6 +2497,9 @@ static const struct pid_entry tgid_base_stuff[] = { 
	INF("limits",	  S_IRUSR, pid_limits),

	INF("limits",	  S_IRUSR, pid_limits),

#ifdef CONFIG_SCHED_DEBUG

#ifdef CONFIG_SCHED_DEBUG

	REG("sched",      S_IRUGO|S_IWUSR, pid_sched),

	REG("sched",      S_IRUGO|S_IWUSR, pid_sched),

#endif

#ifdef CONFIG_HAVE_ARCH_TRACEHOOK

	INF("syscall",    S_IRUSR, pid_syscall),

#endif

#endif

	INF("cmdline",    S_IRUGO, pid_cmdline),

	INF("cmdline",    S_IRUGO, pid_cmdline),

	ONE("stat",       S_IRUGO, tgid_stat),

	ONE("stat",       S_IRUGO, tgid_stat),
@@ -2809,6 +2832,9 @@ static const struct pid_entry tid_base_stuff[] = { 
	INF("limits",	 S_IRUSR, pid_limits),

	INF("limits",	 S_IRUSR, pid_limits),

#ifdef CONFIG_SCHED_DEBUG

#ifdef CONFIG_SCHED_DEBUG

	REG("sched",     S_IRUGO|S_IWUSR, pid_sched),

	REG("sched",     S_IRUGO|S_IWUSR, pid_sched),

#endif

#ifdef CONFIG_HAVE_ARCH_TRACEHOOK

	INF("syscall",   S_IRUSR, pid_syscall),

#endif

#endif

	INF("cmdline",   S_IRUGO, pid_cmdline),

	INF("cmdline",   S_IRUGO, pid_cmdline),

	ONE("stat",      S_IRUGO, tid_stat),

	ONE("stat",      S_IRUGO, tid_stat),