From 4abab5ad6c8465a7528ccdd5f49367da05f78bbd Mon Sep 17 00:00:00 2001 From: Vladimir Azarov Date: Tue, 1 Oct 2024 15:47:05 +0200 Subject: Initial version --- src/signal/sigset.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 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 0000000..f3e8c40 --- /dev/null +++ b/src/signal/sigset.c @@ -0,0 +1,27 @@ +#include + +void (*sigset(int sig, void (*handler)(int)))(int) +{ + struct sigaction sa, sa_old; + sigset_t mask, mask_old; + + sigemptyset(&mask); + if (sigaddset(&mask, sig) < 0) + return SIG_ERR; + + if (handler == SIG_HOLD) { + if (sigaction(sig, 0, &sa_old) < 0) + return SIG_ERR; + if (sigprocmask(SIG_BLOCK, &mask, &mask_old) < 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_old) < 0) + return SIG_ERR; + } + return sigismember(&mask_old, sig) ? SIG_HOLD : sa_old.sa_handler; +} -- cgit v1.2.3