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-rw-r--r--src/libstddjb/sig_catch.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/src/libstddjb/sig_catch.c b/src/libstddjb/sig_catch.c
index 5195d4b..a11e317 100644
--- a/src/libstddjb/sig_catch.c
+++ b/src/libstddjb/sig_catch.c
@@ -2,14 +2,28 @@
/* MT-unsafe */
+#include <skalibs/nonposix.h>
+#include <skalibs/bsdsnowflake.h>
+
#include <signal.h>
+#include <errno.h>
#include <skalibs/functypes.h>
#include <skalibs/sig.h>
+#include <skalibs/nsig.h>
+
+ /*
+ BSD fails sigaction() with EINVAL on non-catchable signals, whereas
+ every reasonable OS succeeds and simply ignores the signal handler.
+ */
int sig_catch (int sig, sig_func_ref f)
{
struct sigaction action = { .sa_handler = f, .sa_flags = SA_RESTART | SA_NOCLDSTOP } ;
sigfillset(&action.sa_mask) ;
- return sigaction(sig, &action, 0) >= 0 ;
+ return sigaction(sig, &action, 0) >= 0
+#ifdef SKALIBS_BSD_SUCKS
+ || (errno == EINVAL && sig >= 1 && sig <= NSIG)
+#endif
+ ;
}