From: Ammar Faizi ammarfaizi2@gnuweeb.org
signal() function is the simpler version of sigaction(). Unlike sigaction(), which fully controls the `struct sigaction`, the caller only cares about the sa_handler when calling the signal() function. signal() internally calls sigaction().
Signed-off-by: Ammar Faizi ammarfaizi2@gnuweeb.org --- tools/include/nolibc/sys.h | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+)
diff --git a/tools/include/nolibc/sys.h b/tools/include/nolibc/sys.h index 7d594155e77f..54e51f154b1f 100644 --- a/tools/include/nolibc/sys.h +++ b/tools/include/nolibc/sys.h @@ -1119,6 +1119,31 @@ int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact) return ret; }
+/* + * sighandler_t signal(int signum, sighandler_t handler); + */ + +static __attribute__((unused)) +sighandler_t signal(int signum, sighandler_t handler) +{ + const struct sigaction act = { + .sa_handler = handler, + .sa_flags = SA_RESTORER, + .sa_restorer = __restore_rt + }; + sighandler_t old_sah; + struct sigaction old; + int ret; + + ret = sys_sigaction(signum, &act, &old); + if (ret < 0) { + SET_ERRNO(-ret); + old_sah = SIG_ERR; + } else { + old_sah = old.sa_handler; + } + return old_sah; +}
/* * int stat(const char *path, struct stat *buf);