76 lines
1.6 KiB
C
76 lines
1.6 KiB
C
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#include <lib.h>
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/* XXX - these have to be hidden because signal() uses them and signal() is
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* ANSI and not POSIX. It would be surely be better to use macros for the
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* library and system uses, and perhaps macros as well as functions for the
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* POSIX user interface. The macros would not need underlines. It may be
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* inconvenient to match the exact semantics of the current functions
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* because the interface is bloated by reporting errors. For library and
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* system uses, the signal number is mostly already known to be valid
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* before the sigset-changing routines are called.
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*/
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#define sigaddset _sigaddset
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#define sigdelset _sigdelset
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#define sigemptyset _sigemptyset
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#define sigfillset _sigfillset
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#define sigismember _sigismember
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#include <signal.h>
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/* Low bit of signal masks. */
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#define SIGBIT_0 ((sigset_t) 1)
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/* Mask of valid signals (0 - _NSIG). */
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#define SIGMASK (((SIGBIT_0 << _NSIG) << 1) - 1)
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#define sigisvalid(signo) ((unsigned) (signo) <= _NSIG)
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PUBLIC int sigaddset(set, signo)
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sigset_t *set;
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int signo;
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{
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if (!sigisvalid(signo)) {
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errno = EINVAL;
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return -1;
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}
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*set |= SIGBIT_0 << signo;
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return 0;
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}
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PUBLIC int sigdelset(set, signo)
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sigset_t *set;
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int signo;
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{
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if (!sigisvalid(signo)) {
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errno = EINVAL;
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return -1;
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}
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*set &= ~(SIGBIT_0 << signo);
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return 0;
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}
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PUBLIC int sigemptyset(set)
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sigset_t *set;
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{
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*set = 0;
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return 0;
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}
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PUBLIC int sigfillset(set)
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sigset_t *set;
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{
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*set = SIGMASK;
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return 0;
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}
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PUBLIC int sigismember(set, signo)
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_CONST sigset_t *set;
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int signo;
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{
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if (!sigisvalid(signo)) {
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errno = EINVAL;
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return -1;
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}
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if (*set & (SIGBIT_0 << signo))
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return 1;
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return 0;
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}
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