The Single UNIX ® Specification, Version 2
Copyright © 1997 The Open Group


sigdelset - delete a signal from a signal set


#include <signal.h>

int sigdelset(sigset_t *set, int signo);


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 initialised in this way, but is nonetheless supplied as an argument to any of sigaction(), sigaddset(), sigdelset(), sigismember(), sigpending() or sigprocmask(), the results are undefined.


Upon successful completion, sigdelset() returns 0. Otherwise, it returns -1 and sets errno to indicate the error.


The sigdelset() function may fail if:
The signo argument is not a valid signal number, or is an unsupported signal number.








sigaction(), sigaddset(), sigemptyset(), sigfillset(), sigismember(), sigpending(), sigprocmask(), sigsuspend(), <signal.h>.


Derived from the POSIX.1-1988 standard.

UNIX ® is a registered Trademark of The Open Group.
Copyright © 1997 The Open Group
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