NAME
sigdelset - delete a signal from a signal set
SYNOPSIS
#include <signal.h>
int sigdelset(sigset_t *set, int signo);
DESCRIPTION
The sigdelset() function deletes the individual signal specified by
signo from the signal set pointed to by set.
Applications should call either sigemptyset() or sigfillset() at least
once for each object of type sigset_t prior to any other use of that
object. If such an object is not initialized in this way, but is
nonetheless supplied as an argument to any of pthread_sigmask(),
sigaction(), sigaddset(), sigdelset(), sigismember(), sigpending(),
sigprocmask(), sigsuspend(), sigtimedwait(), sigwait(), or
sigwaitinfo(), the results are undefined.
RETURN VALUE
Upon successful completion, sigdelset() shall return 0; otherwise, it
shall return -1 and set errno to indicate the error.
ERRORS
The sigdelset() function may fail if:
EINVAL The signo argument is not a valid signal number, or is an
unsupported signal number.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
Signal Concepts , sigaction() , sigaddset() , sigemptyset() ,
sigfillset() , sigismember() , sigpending() , sigprocmask() ,
sigsuspend() , the Base Definitions volume of IEEE Std 1003.1-2001,
<signal.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online
at http://www.opengroup.org/unix/online.html .