RTEMS 4.9.4 On-Line Library

Signal Manager sigprocmask - Examine and Change Process Blocked Signals

RTEMS POSIX API User's Guide

2.4.8: sigprocmask - Examine and Change Process Blocked Signals

CALLING SEQUENCE:

#include <signal.h>

int sigprocmask(
  int             how,
  const sigset_t *set,
  sigset_t       *oset
);

STATUS CODES:

EINVAL: Invalid argument passed.

DESCRIPTION:

This function is used to alter the set of currently blocked signals on a process wide basis. A blocked signal will not be received by the process. The behavior of this function is dependent on the value of how which may be one of the following:

SIG_BLOCK: The set of blocked signals is set to the union of set and those signals currently blocked.
SIG_UNBLOCK: The signals specific in set are removed from the currently blocked set.
SIG_SETMASK: The set of currently blocked signals is set to set.

If oset is not NULL, then the set of blocked signals prior to this call is returned in oset.

NOTES:

It is not an error to unblock a signal which is not blocked.

RTEMS POSIX API User's Guide