libc: basic signal stubs, non-spec-compliant write() stub

1 files changed, 76 insertions, 0 deletions

diff --git a/src/user/lib/signal.c b/src/user/lib/signal.c
index 0ec8b50..d8b673d 100644
--- a/src/user/lib/signal.c
+++ b/src/user/lib/signal.c
@@ -23,3 +23,79 @@ const char *const sys_siglist[] = {
 	"SIGWINCH", /* 21 */
 	"SIGCHLD", /* 22 */
 };
+
+static struct sigaction sigaction_default = {};
+static struct sigaction *sigaction_current[] = {
+	NULL,
+	&sigaction_default, /* 1 */
+	&sigaction_default, /* 2 */
+	&sigaction_default, /* 3 */
+	&sigaction_default, /* 4 */
+	&sigaction_default, /* 5 */
+	&sigaction_default, /* 6 */
+	&sigaction_default, /* 8 */
+	&sigaction_default, /* 9 */
+	&sigaction_default, /* 11 */
+	&sigaction_default, /* 13 */
+	&sigaction_default, /* 14 */
+	&sigaction_default, /* 15 */
+	&sigaction_default, /* 16 */
+	&sigaction_default, /* 17 */
+	&sigaction_default, /* 18 */
+	&sigaction_default, /* 19 */
+	&sigaction_default, /* 20 */
+	&sigaction_default, /* 21 */
+	&sigaction_default, /* 22 */
+};
+
+int sigaction(int sig, const struct sigaction *act, struct sigaction *oldact) {
+	const int siglen = sizeof(sigaction_current) / sizeof(sigaction_current[0]);
+	if (sig >= siglen) {
+		return errno = EINVAL, -1;
+	}
+	if (oldact) {
+		oldact = sigaction_current[sig];
+	}
+	if (act) {
+		if (sig == SIGKILL) {
+			return errno = EINVAL, -1;
+		}
+		sigaction_current[sig] = (void*)act;
+	}
+	return 0;
+}
+
+int sigemptyset(sigset_t *set) {
+	(void)set;
+	return 0;
+}
+
+int sigfillset(sigset_t *set) {
+	(void)set;
+	return 0;
+}
+
+int sigprocmask(int how, const sigset_t *set, const sigset_t *oldset) {
+	(void)how; (void)set; (void)oldset;
+	__libc_panic("unimplemented");
+}
+
+int sigsuspend(const sigset_t *mask) {
+	(void)mask;
+	__libc_panic("unimplemented");
+}
+
+int signal(int sig, void (*func)(int)) {
+	(void)sig; (void)func;
+	__libc_panic("unimplemented");
+}
+
+int kill(pid_t pid, int sig) {
+	(void)pid; (void)sig;
+	__libc_panic("unimplemented");
+}
+
+int raise(int sig) {
+	(void)sig;
+	__libc_panic("unimplemented");
+}