syscalls: sigsuspend

kernel-src/arch/x86-64/syscall.asm

@@ -87,6 +87,7 @@ extern syscall_setuid
 extern syscall_seteuid
 extern syscall_setgid
 extern syscall_setegid
+extern syscall_sigsuspend
 syscalltab:
 dq syscall_print
 dq syscall_mmap
@@ -176,7 +177,8 @@ dq syscall_setuid
 dq syscall_seteuid
 dq syscall_setgid
 dq syscall_setegid
-syscallcount equ 88
+dq syscall_sigsuspend
+syscallcount equ 89
 section .text
 global arch_syscall_entry
 ; on entry:

kernel-src/arch/x86-64/syscalllog.c

@@ -5,7 +5,7 @@
 
 #ifdef SYSCALL_LOGGING
 
-#define SYSCALL_COUNT 88
+#define SYSCALL_COUNT 89
 #define LOGSTR(x) arch_e9_puts(x)
 
 static char *name[] = {
@@ -96,7 +96,8 @@ static char *name[] = {
 	"setuid",
 	"seteuid",
 	"setgid",
-	"setegid"
+	"setegid",
+	"sigsuspend"
 };
 
 static char *args[] = {
@@ -187,7 +188,8 @@ static char *args[] = {
 	"uid %d", // setuid
 	"euid %d", // seteuid
 	"gid %d", // setgid
-	"egid %d" // setegid
+	"egid %d", // setegid
+	"sigset %p" // sigsuspend
 };
 
 #endif

kernel-src/sys/syscalls/sigsuspend.c

@@ -0,0 +1,26 @@
+#include <kernel/syscalls.h>
+#include <kernel/signal.h>
+#include <logging.h>
+
+syscallret_t syscall_sigsuspend(context_t *, sigset_t *umask) {
+	syscallret_t ret = {
+		.ret = -1
+	};
+
+	sigset_t mask;
+	sigset_t old;
+
+	ret.errno = usercopy_fromuser(&mask, umask, sizeof(sigset_t));
+	if (ret.errno)
+		return ret;
+
+	signal_changemask(_cpu()->thread, SIG_SETMASK, &mask, &old);
+
+	sched_preparesleep(true);
+	__assert(sched_yield() == SCHED_WAKEUP_REASON_INTERRUPTED);
+
+	signal_changemask(_cpu()->thread, SIG_SETMASK, &old, NULL);
+
+	ret.errno = EINTR;
+	return ret;
+}