1SIGSETOPS(3)               Library Functions Manual               SIGSETOPS(3)
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NAME

6       sigemptyset, sigfillset, sigaddset, sigdelset, sigismember - manipulate
7       signal sets
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SYNOPSIS

10       #include <signal.h>
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12       sigemptyset(set)
13       sigset_t *set;
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15       sigfillset(set)
16       sigset_t *set;
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18       sigaddset(set, signo)
19       sigset_t *set;
20       int signo;
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22       sigdelset(set, signo)
23       sigset_t *set;
24       int signo;
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26       sigismember(set, signo)
27       sigset_t *set;
28       int signo;
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DESCRIPTION

31       These functions manipulate signal sets stored in a sigset_t  .   Either
32       sigemptyset  or  sigfillset  must  be  called  for every object of type
33       sigset_t before any other use of the object.
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35       The sigemptyset function initializes a signal set to be empty.
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37       The sigfillset function initializes a signal set to  contain  all  sig‐
38       nals.
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40       The  sigaddset  function  adds the specified signal signo to the signal
41       set.
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43       The sigdelset function deletes the specified signal signo from the sig‐
44       nal set.
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46       The  sigismember  function  returns whether a specified signal signo is
47       contained in the signal set.
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49       These functions are provided as macros in the include file  <signal.h>.
50       Actual  functions  are  available  if  their  names are undefined (with
51       #undef name).
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RETURN VALUES

54       The sigismember function returns 1 if the signal is  a  member  of  the
55       set, 0 otherwise.  The other functions return 0.
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ERRORS

58       Currently no errors are detected.
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SEE ALSO

61       kill(2), sigaction(2), sigsuspend(2)
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STANDARDS

64       These functions are defined by IEEE Std1003.1-1988 (``POSIX'').
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684.4 Berkeley Distribution      September 3, 1997                  SIGSETOPS(3)