sigismember(3)

1SIGSETOPS(3)               Linux Programmer's Manual              SIGSETOPS(3)
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NAME

6       sigemptyset, sigfillset, sigaddset, sigdelset, sigismember - POSIX sig‐
7       nal set operations.
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SYNOPSIS

11       #include <signal.h>
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13       int sigemptyset(sigset_t *set);
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15       int sigfillset(sigset_t *set);
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17       int sigaddset(sigset_t *set, int signum);
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19       int sigdelset(sigset_t *set, int signum);
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21       int sigismember(const sigset_t *set, int signum);
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DESCRIPTION

25       The sigsetops(3) functions allow the manipulation of POSIX signal sets.
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27       sigemptyset() initializes the signal set given by set  to  empty,  with
28       all signals excluded from the set.
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30       sigfillset() initializes set to full, including all signals.
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32       sigaddset()  and  sigdelset() add and delete respectively signal signum
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35       sigismember() tests whether signum is a member of set.
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RETURN VALUE

38       sigemptyset(), sigfillset(), sigaddset(), and sigdelset() return  0  on
39       success and -1 on error.
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41       sigismember()  returns  1  if signum is a member of set, 0 if signum is
42       not a member, and -1 on error.
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ERRORS

45       EINVAL sig is not a valid signal.
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CONFORMING TO

48       POSIX.1-2001.
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GLIBC NOTES

51       If the _GNU_SOURCE feature  test  macro  is  defined,  then  <signal.h>
52       exposes three other functions for manipulating signal sets.
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54       int sigisemptyset(sigset_t *set);
55              returns 1 if set contains no signals, and 0 otherwise.
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57       int sigorset(sigset_t *dest, sigset_t *left, sigset_t *right);
58              places the union of the sets left and right in dest.
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60       int sigandset(sigset_t *dest, sigset_t *left, sigset_t *right);
61              places the intersection of the sets left and right in dest.
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63       sigorset() and sigandset() return 0 on success, and -1 on failure.
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65       These  functions  are non-standard (a few other systems provide similar
66       functions) and their use should be avoided in portable applications.
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