Kernel/LibC: Add {get,set}pgrp()

kernel/include/kernel/Process.h

@@ -79,6 +79,7 @@ namespace Kernel
 		BAN::ErrorOr<long> sys_setegid(gid_t);
 		BAN::ErrorOr<long> sys_setreuid(uid_t, uid_t);
 		BAN::ErrorOr<long> sys_setregid(gid_t, gid_t);
+		BAN::ErrorOr<long> sys_setpgrp();
 
 		BAN::ErrorOr<long> sys_getuid() const { return m_credentials.ruid(); }
 		BAN::ErrorOr<long> sys_getgid() const { return m_credentials.rgid(); }

kernel/kernel/Process.cpp

@@ -1137,6 +1137,13 @@ namespace Kernel
 		return 0;
 	}
 
+	BAN::ErrorOr<long> Process::sys_setpgrp()
+	{
+		LockGuard _(m_lock);
+		m_pgrp = pid();
+		return pgrp();
+	}
+
 	BAN::ErrorOr<BAN::String> Process::absolute_path_of(BAN::StringView path) const
 	{
 		ASSERT(m_lock.is_locked());

kernel/kernel/Syscall.cpp

@@ -173,6 +173,12 @@ namespace Kernel
 		case SYS_GET_PID:
 			ret = Process::current().pid();
 			break;
+		case SYS_GET_PGRP:
+			ret = Process::current().pgrp();
+			break;
+		case SYS_SET_PGRP:
+			ret = Process::current().sys_setpgrp();
+			break;
 		default:
 			dwarnln("Unknown syscall {}", syscall);
 			break;

libc/include/sys/syscall.h

@@ -48,6 +48,8 @@ __BEGIN_DECLS
 #define SYS_SIGNAL_DONE 41
 #define SYS_TCSETPGRP 42
 #define SYS_GET_PID 43
+#define SYS_GET_PGRP 44
+#define SYS_SET_PGRP 45
 
 __END_DECLS
 

libc/unistd.cpp

@@ -208,6 +208,11 @@ gid_t getegid(void)
 	return syscall(SYS_GET_EGID);
 }
 
+pid_t getpgrp(void)
+{
+	return syscall(SYS_GET_PGRP);
+}
+
 int seteuid(uid_t uid)
 {
 	return syscall(SYS_SET_EUID, uid);
@@ -238,6 +243,11 @@ int setregid(gid_t rgid, gid_t egid)
 	return syscall(SYS_SET_REGID, rgid, egid);
 }
 
+pid_t setpgrp(void)
+{
+	return syscall(SYS_SET_PGRP);
+}
+
 int tcsetpgrp(int fildes, pid_t pgid_id)
 {
 	return syscall(SYS_TCSETPGRP, fildes, pgid_id);