HP 3000 Manuals HP 3000 Manuals
sigaddset
Adds a signal to a signal set.
Syntax
#include <signal.h>
int sigaddset (sigset_t *set, int sig);
Parameters
set A pointer to a structure of type sigset_t containing a set of
signals to which sig is to be added.
sig The signal number of the signal to add to set. Valid signals
are described in Table 3-5 .
Return Values
0 Success.
-1 An error occurred. The signal is not added, and errno is set
to indicate the error condition.
Description
The sigaddset() function adds the signal sig to the set of signals
specified in the structure pointed to by set.
The structure of type sigset_t pointed to by set must be initialized by
sigemptyset() or sigfillset() prior to being used by sigaddset();
otherwise, the results are undefined.
Implementation Considerations
Refer to the EFAULT error description below.
Errors
If an error occurs, errno is set to one of the following values:
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.
EINVAL CAUSE The signal sig is not a valid signal number.
ACTION Refer to Table 3-5 for descriptions of valid
signal numbers.
See Also
sigaction(), sigdelset(), sigemptyset(), sigfillset(), sigismember(),
<signal.h>, POSIX.1 (Section 3.3.3)