| SIGSETMASK(3) | Library Functions Manual | SIGSETMASK(3) | 
sigsetmask —
#include <signal.h>
int
  
  sigsetmask(int
    mask);
sigmask(signum);
sigsetmask() sets the current signal mask.
    Signals are blocked from delivery if the corresponding bit in
    mask is a 1; the macro
    sigmask() is provided to construct the mask for a
    given signum.
The system quietly disallows SIGKILL or
    SIGSTOP to be blocked.
sigsetmask():
int omask; omask = sigblock(sigmask(SIGINT) | sigmask(SIGHUP)); ... sigsetmask(omask & ~(sigmask(SIGINT) | sigmask(SIGHUP)));
Could be converted literally to:
sigset_t set, oset; sigemptyset(&set); sigaddset(&set, SIGINT); sigaddset(&set, SIGHUP); sigprocmask(SIG_BLOCK, &set, &oset); ... sigdelset(&oset, SIGINT); sigdelset(&oset, SIGHUP); sigprocmask(SIG_SETMASK, &oset, NULL);
Another, clearer, alternative is:
sigset_t set; sigemptyset(&set); sigaddset(&set, SIGINT); sigaddset(&set, SIGHUP); sigprocmask(SIG_BLOCK, &set, NULL); ... sigprocmask(SIG_UNBLOCK, &set, NULL);
To completely clear the signal mask using
    sigsetmask() one can do:
(void) sigsetmask(0);
Which can be expressed via sigprocmask(2) as:
sigset_t eset; sigemptyset(&eset); (void) sigprocmask(SIG_SETMASK, &eset, NULL);
sigsetmask() function call appeared in
  4.2BSD and has been deprecated.
| August 10, 2002 | NetBSD 10.0 |