sigaddset(3) - NetBSD Manual Pages

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SIGSETOPS(3)            NetBSD Library Functions Manual           SIGSETOPS(3)

sigemptyset, sigfillset, sigaddset, sigdelset, sigismember -- manipulate signal sets
Standard C Library (libc, -lc)
#include <signal.h> int sigemptyset(sigset_t *set); int sigfillset(sigset_t *set); int sigaddset(sigset_t *set, int signo); int sigdelset(sigset_t *set, int signo); int sigismember(sigset_t *set, int signo);
These functions manipulate signal sets stored in a sigset_t. Either sigemptyset() or sigfillset() must be called for every object of type sigset_t before any other use of the object. The sigemptyset() function initializes a signal set to be empty. The sigfillset() function initializes a signal set to contain all sig- nals. The sigaddset() function adds the specified signal signo to the signal set. The sigdelset() function deletes the specified signal signo from the sig- nal set. The sigismember() function returns whether a specified signal signo is contained in the signal set. sigemptyset() and sigfillset() are provided as macros, but actual func- tions are available if their names are undefined (with #undef name).
The sigismember() function returns 1 if the signal is a member of the set, a 0 otherwise. The other functions return 0 upon success. A -1 return value indicates an error occurred and the global variable errno is set to indicate the reason.
These functions could fail if one of the following occurs: [EINVAL] signo has an invalid value.
kill(2), sigaction(2), sigsuspend(2), signal(7)
These functions conform to ISO/IEC 9945-1:1990 (``POSIX.1''). NetBSD 8.1 June 4, 1993 NetBSD 8.1
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