Initializes a signal set to the empty set.
Syntax |
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#include <signal.h>
int sigemptyset (sigset_t *set);
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Parameters |
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- set
A pointer to a structure of type sigset_t to initialize to the empty set.
Return Values |
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- 0
Success.
- -1
An error occurred. The signal set is not initialized, and errno is set to indicate the error condition.
Description |
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The sigemptyset() function initializes set to the empty set. All signals described in Table 3-6 “POSIX/iX Signals” are excluded from the set.
The sigemptyset() or sigfillset() function must be called to initialize the structure of type sigset_t pointed to by set prior to its use by other functions.
Implementation Considerations |
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Refer to the EFAULT error description below.
Errors |
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If an error occurs, errno is set to the following value:
| EFAULT | CAUSE
| The system detected a NULL or bad address in attempting to use
the set parameter. |
| | ACTION
| Make sure that the pointer is correctly initialized.
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See Also |
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sigaction(), sigaddset(), sigdelset(), sigfillset(), sigismember(), <signal.h>, POSIX.1 Section 3.3.3.
