sigaddset

Adds the specified individual signal.

Format

#include  <signal.h>

int sigaddset  (sigset_t *set, int sig_number);

Arguments

set: The signal set.
sig_number: The individual signal.

Description

This function manipulates sets of signals. This function operates on data objects that you can address by the application, not on any set of signals known to the system. For example, this function does not operate on the set blocked from delivery to a process or the set pending for a process.

The sigaddset function adds the individual signal specified by sig_number from the signal set specified by set.

Example

The following example shows how to generate and use a signal mask that blocks only the SIGINT signal from delivery.

       #include <signal.h>
       int return_value;
       sigset_t newset;
         . . .
       sigemptyset(&newset);
       sigaddset(&newset, SIGINT);
       return_value = sigprocmask (SIG_SETMASK, &newset, NULL);

Return Values

0 Indicates success.

-1 Indicates an error; errno is set to one of the following values:

EINVAL - The value of sig_number is not a valid signal number.

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