tracehook_get_signal(9) [suse man page]

TRACEHOOK_GET_SIGNAL(9) 					 Kernel Internals					   TRACEHOOK_GET_SIGNAL(9)

NAME

       tracehook_get_signal - deliver synthetic signal to traced task

SYNOPSIS

       int tracehook_get_signal(struct task_struct * task, struct pt_regs * regs, siginfo_t * info, struct k_sigaction * return_ka);

ARGUMENTS

       task

	   current

       regs
	   task_pt_regs(current)

       info
	   details of synthetic signal

       return_ka
	   sigaction for synthetic signal

DESCRIPTION

       Return zero to check for a real pending signal normally. Return -1 after releasing the siglock to repeat the check. Return a signal number
       to induce an artifical signal delivery, setting *info and *return_ka to specify its details and behavior.

       The return_ka->sa_handler value controls the disposition of the signal, no matter the signal number. For SIG_DFL, the return value is a
       representative signal to indicate the behavior (e.g.  SIGTERM for death, SIGQUIT for core dump, SIGSTOP for job control stop, SIGTSTP for
       stop unless in an orphaned pgrp), but the signal number reported will be info->si_signo instead.

       Called with task->sighand->siglock held, before dequeuing pending signals.

Kernel Hackers Manual 2.6.					     July 2010						   TRACEHOOK_GET_SIGNAL(9)

SIGWAITINFO(2)						     Linux Programmer's Manual						    SIGWAITINFO(2)

NAME

       sigwaitinfo, sigtimedwait - synchronously wait for queued signals

SYNOPSIS

       #include <signal.h>

       int sigwaitinfo(const sigset_t *set, siginfo_t *info);

       int sigtimedwait(const sigset_t *set, siginfo_t *info, const struct timespec timeout);

DESCRIPTION

       sigwaitinfo()  suspends	execution  of  the calling process until one of the signals in set is delivered.  (If one of the signals in set is
       already pending for the calling process, sigwaitinfo() will return immediately with information about that signal.)

       sigwaitinfo() removes the delivered signal from the calling process's list of pending signals and returns the signal number as its function
       result.	 If  the  info argument is not NULL, then it returns a structure of type siginfo_t (see sigaction(2)) containing information about
       the signal.

       Signals returned via sigwaitinfo() are delivered in the usual order; see signal(7) for further details.

       sigtimedwait() operates in exactly the same way as sigwaitinfo() except that it has an additional argument, timeout, which enables an upper
       bound to be placed on the time for which the process is suspended.  This argument is of the following type:

	 struct timespec {
	     long    tv_sec;	     /* seconds */
	     long    tv_nsec;	     /* nanoseconds */
	 }

       If both fields of this structure are specified as 0, a poll is performed: sigtimedwait() returns immediately, either with information about
       a signal that was pending for the caller, or with an error if none of the signals in set was pending.

RETURN VALUE

       On success, both sigwaitinfo() and sigtimedwait() return a signal number (i.e., a value greater than zero).  On failure both  calls  return
       -1, with errno set to indicate the error.

ERRORS

       EAGAIN No signal in set was delivered within the timeout period specified to sigtimedwait().

       EINVAL timeout was invalid.

       EINTR  The wait was interrupted by a signal handler.  (This handler was for a signal other than one of those in set.)

NOTES

       In  normal usage, the caller blocks the signals in set via a prior call to sigprocmask() (so that the default disposition for these signals
       does not occur if they are delivered between successive calls to sigwaitinfo()or sigtimedwait()) and does not establish handlers for  these
       signals.

       POSIX  leaves  the meaning of a NULL value for the timeout argument of sigtimedwait() unspecified, permitting the possibility that this has
       the same meaning as a call to sigwaitinfo(), and indeed this is what is done on Linux.

CONFORMING TO

       POSIX 1003.1-2001

SEE ALSO

       kill(2), sigaction(2), signal(2), sigpending(2), sigprocmask(2), sigqueue(2), signal(7), sigsetops(3)

Linux 2.4.18							    2002-06-07							    SIGWAITINFO(2)