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This page displays the COHERENT manpage for sigismember() [Check if a signal is a member of a set].
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sigismember() -- Signal Function (libc) Check if a signal is a member of a set #include <signal.h> int sigismember (set, signo) sigset_t *set; int signo; sigismembeer() is one of a set of signalling functions that manipulate data objects addressable by the application, instead of a set of signals known to the system. It tests whether the signal signo is a member of the set of signals to which set points. If signo is a member of set, sigismember() returns zero. If signo is set to an invalid or unsupported value, it returns -1 and sets errno to EINVAL. See Also libc, sigaction(), sigaddset(), sigdelset(), sigemptyset(), sigfillset() Notes If your program is compiled using the System V Release 4 compilation environment, this is a function that is linked in from libc. If not, a macro form is used.