job control: sessions and process groups

kernel-src/sys/syscalls/getpid.c

@@ -1,5 +1,7 @@
 #include <kernel/syscalls.h>
 #include <arch/cpu.h>
+#include <kernel/jobctl.h>
+#include <logging.h>
 
 syscallret_t syscall_getpid(context_t *ctx) {
 	syscallret_t ret = {
@@ -8,3 +10,31 @@ syscallret_t syscall_getpid(context_t *ctx) {
 	};
 	return ret;
 }
+
+syscallret_t syscall_getppid(context_t *ctx) {
+	syscallret_t ret = {
+		.ret = _cpu()->thread->proc->parent ? _cpu()->thread->proc->parent->pid : 1,
+		.errno = 0
+	};
+	return ret;
+}
+
+syscallret_t syscall_getpgid(context_t *ctx, pid_t pid) {
+	syscallret_t ret = {
+		.errno = 0
+	};
+
+	__assert(pid == 0);
+	ret.ret = jobctl_getpgid(_cpu()->thread->proc);
+	return ret;
+}
+
+syscallret_t syscall_getsid(context_t *ctx, pid_t pid) {
+	syscallret_t ret = {
+		.errno = 0
+	};
+
+	__assert(pid == 0);
+	ret.ret = jobctl_getsid(_cpu()->thread->proc);
+	return ret;
+}