From 0b44a0315b47dd8eced9f3b7f31580cf14bbfc01 Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Sat, 12 Feb 2011 00:22:29 -0500 Subject: initial check-in, version 0.5.0 --- src/signal/sigset.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 src/signal/sigset.c (limited to 'src/signal/sigset.c') diff --git a/src/signal/sigset.c b/src/signal/sigset.c new file mode 100644 index 00000000..1b6b38fd --- /dev/null +++ b/src/signal/sigset.c @@ -0,0 +1,28 @@ +#include +#include + +void (*sigset(int sig, void (*handler)(int)))(int) +{ + struct sigaction sa, sa_old; + sigset_t mask; + + sigemptyset(&mask); + if (sigaddset(&mask, sig) < 0) + return SIG_ERR; + + if (handler == SIG_HOLD) { + if (sigaction(sig, NULL, &sa_old) < 0) + return SIG_ERR; + if (sigprocmask(SIG_BLOCK, &mask, &mask) < 0) + return SIG_ERR; + } else { + sa.sa_handler = handler; + sa.sa_flags = 0; + sigemptyset(&sa.sa_mask); + if (sigaction(sig, &sa, &sa_old) < 0) + return SIG_ERR; + if (sigprocmask(SIG_UNBLOCK, &mask, &mask) < 0) + return SIG_ERR; + } + return sigismember(&mask, sig) ? SIG_HOLD : sa_old.sa_handler; +} -- cgit v1.2.1