sigemptyset

Initializes the signal set to exclude all signals.

Format 

#include  <signal.h>

int sigemptyset  (sigset_t *set);

Arguments

set
The signal set.

Description

The sigemptyset function initializes the signal set pointed to by set such that you exclude all signals. A call to sigemptyset or sigfillset must be made at least once for each object of type sigset_t prior to any other use of that object.

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.

See also sigfillset in this section.

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; the global errno is set to indicate the error. 

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