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SIGPROCMASK(2) FreeBSD System Calls Manual SIGPROCMASK(2)
NAME
sigprocmask - manipulate current signal mask
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <signal.h>
int
sigprocmask(int how, const sigset_t * restrict set,
sigset_t * restrict oset);
DESCRIPTION
The sigprocmask() system call examines and/or changes the current signal
mask (those signals that are blocked from delivery). Signals are blocked
if they are members of the current signal mask set.
If set is not null, the action of sigprocmask() depends on the value of
the how argument. The signal mask is changed as a function of the
specified set and the current mask. The function is specified by how
using one of the following values from <signal.h>:
SIG_BLOCK The new mask is the union of the current mask and the
specified set.
SIG_UNBLOCK The new mask is the intersection of the current mask and the
complement of the specified set.
SIG_SETMASK The current mask is replaced by the specified set.
If oset is not null, it is set to the previous value of the signal mask.
When set is null, the value of how is insignificant and the mask remains
unset providing a way to examine the signal mask without modification.
The system quietly disallows SIGKILL or SIGSTOP to be blocked.
In threaded applications, pthread_sigmask(3) must be used instead of
sigprocmask().
RETURN VALUES
The sigprocmask() function returns the value 0 if successful; otherwise
the value -1 is returned and the global variable errno is set to indicate
the error.
ERRORS
The sigprocmask() system call will fail and the signal mask will be
unchanged if one of the following occurs:
[EINVAL] The how argument has a value other than those listed
here.
SEE ALSO
kill(2), sigaction(2), sigpending(2), sigsuspend(2), fpsetmask(3),
pthread_sigmask(3), sigsetops(3)
STANDARDS