Add [gs]etres[ug]id(2) syscall to libc and use it in emulating some 4.3BSD

functions.

2 files changed, 106 insertions, 9 deletions

diff --git a/lib/libc/sys/Makefile.inc b/lib/libc/sys/Makefile.inc
index 89f0f848e18..7ae2a594698 100644
--- a/lib/libc/sys/Makefile.inc
+++ b/lib/libc/sys/Makefile.inc
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.inc,v 1.56 2002/08/05 22:42:12 art Exp $
+#	$OpenBSD: Makefile.inc,v 1.57 2002/10/30 20:15:29 millert Exp $
 #	$NetBSD: Makefile.inc,v 1.35 1995/10/16 23:49:07 jtc Exp $
 #	@(#)Makefile.inc	8.1 (Berkeley) 6/17/93
 
@@ -40,8 +40,8 @@ ASM=	accept.o access.o acct.o adjtime.o bind.o chdir.o chflags.o chmod.o \
 	getfh.o getfsstat.o getgid.o getgroups.o getitimer.o getpeereid.o \
 	getpeername.o \
 	getpgid.o \
-	getpgrp.o getpid.o getppid.o getpriority.o getrlimit.o getrusage.o \
-	getsid.o \
+	getpgrp.o getpid.o getppid.o getpriority.o getresgid.o getresuid.o \
+	getrlimit.o getrusage.o getsid.o \
 	getsockname.o getsockopt.o gettimeofday.o getuid.o issetugid.o \
 	ioctl.o kill.o kevent.o kqueue.o \
 	ktrace.o lchown.o lfs_bmapv.o lfs_markv.o lfs_segclean.o lfs_segwait.o \
@@ -53,7 +53,8 @@ ASM=	accept.o access.o acct.o adjtime.o bind.o chdir.o chflags.o chmod.o \
 	read.o readlink.o readv.o reboot.o recvfrom.o recvmsg.o rename.o \
 	revoke.o rmdir.o select.o semget.o semop.o sendmsg.o sendto.o \
 	setegid.o seteuid.o setgid.o setgroups.o setitimer.o setpgid.o \
-	setpriority.o setrlimit.o setsid.o setsockopt.o settimeofday.o \
+	setpriority.o setresgid.o setresuid.o setrlimit.o setsid.o \
+	setsockopt.o settimeofday.o \
 	setuid.o shmat.o shmctl.o shmdt.o shmget.o shutdown.o sigaction.o \
 	sigaltstack.o socket.o socketpair.o stat.o statfs.o swapon.o swapctl.o \
 	symlink.o sync.o sysarch.o umask.o undelete.o unlink.o unmount.o \
@@ -223,11 +224,11 @@ MAN+=	accept.2 access.2 acct.2 adjtime.2 bind.2 brk.2 chdir.2 chflags.2 \
 	nfssvc.2 open.2 pathconf.2 \
 	pipe.2 profil.2 poll.2 ptrace.2 quotactl.2 read.2 readlink.2 reboot.2 \
 	recv.2 rename.2 revoke.2 rfork.2 rmdir.2 select.2 send.2 setgroups.2 \
-	setpgid.2 setsid.2 setuid.2 shutdown.2 sigaction.2 sigaltstack.2 \
-	sigpending.2 sigprocmask.2 sigreturn.2 sigstack.2 sigsuspend.2 \
-	socket.2 socketpair.2 stat.2 statfs.2 swapctl.2 symlink.2 sync.2 \
-	sysarch.2 syscall.2 truncate.2 umask.2 unlink.2 utimes.2 vfork.2 \
-	wait.2 write.2
+	setpgid.2 setresuid.2 setsid.2 setuid.2 shutdown.2 sigaction.2 \
+	sigaltstack.2 sigpending.2 sigprocmask.2 sigreturn.2 sigstack.2 \
+	sigsuspend.2 socket.2 socketpair.2 stat.2 statfs.2 swapctl.2 symlink.2 \
+	sync.2 sysarch.2 syscall.2 truncate.2 umask.2 unlink.2 utimes.2 \
+	vfork.2 wait.2 write.2
 
 MAN+=	extattr_get_file.2
 MLINKS+=extattr_get_file.2 extattr_set_file.2 \
diff --git a/lib/libc/sys/setresuid.2 b/lib/libc/sys/setresuid.2
new file mode 100644
index 00000000000..523a072c539
--- /dev/null
+++ b/lib/libc/sys/setresuid.2
@@ -0,0 +1,96 @@
+.\" $OpenBSD: setresuid.2,v 1.1 2002/10/30 20:15:29 millert Exp $
+.\"
+.\" Copyright (c) 2000
+.\"      Sheldon Hearn.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES
+.\"
+.\" $FreeBSD: src/lib/libc/sys/setresuid.2,v 1.12 2001/10/01 16:09:02 ru Exp $
+.\"
+.Dd October 20, 2002
+.Dt SETRESUID 2
+.Os
+.Sh NAME
+.Nm getresgid ,
+.Nm getresuid ,
+.Nm setresgid ,
+.Nm setresuid
+.Nd "get or set real, effective and saved user or group ID"
+.Sh SYNOPSIS
+.Fd #include <sys/types.h>
+.Fd #include <unistd.h>
+.Ft int
+.Fn getresgid "gid_t *rgid" "gid_t *egid" "gid_t *sgid"
+.Ft int
+.Fn getresuid "uid_t *ruid" "uid_t *euid" "uid_t *suid"
+.Ft int
+.Fn setresgid "gid_t rgid" "gid_t egid" "gid_t sgid"
+.Ft int
+.Fn setresuid "uid_t ruid" "uid_t euid" "uid_t suid"
+.Sh DESCRIPTION
+The
+.Fn setresuid
+function sets the real,
+effective and saved user IDs of the current process.
+The analogous
+.Fn setresgid
+sets the real, effective and saved group IDs.
+.Pp
+Privileged processes may set these IDs to arbitrary values.
+Unprivileged processes are restricted
+in that each of the new IDs must match one of the current IDs.
+.Pp
+Passing \-1 as an argument causes the corresponding value
+to remain unchanged.
+.Pp
+The
+.Fn getresgid
+and
+.Fn getresuid
+calls retrieve the real, effective, and saved group and user IDs of
+the current process, respectively.
+.Sh RETURN VALUES
+Upon success, these functions return 0; otherwise \-1 is returned.
+.Sh ERRORS
+.Bl -tag -width Er
+.It Bq Er EPERM
+The calling process was not privileged and tried to change one or
+more IDs to a value which was not the current real ID, the current
+effective ID nor the current saved ID.
+.It Bq Er EFAULT
+An address passed to
+.Fn getresgid
+or
+.Fn getresuid
+was invalid.
+.El
+.Sh SEE ALSO
+.Xr getegid 2 ,
+.Xr geteuid 2 ,
+.Xr getgid 2 ,
+.Xr getuid 2 ,
+.Xr issetugid 2 ,
+.Xr setgid 2 ,
+.Xr setregid 2 ,
+.Xr setreuid 2 ,
+.Xr setuid 2
+.Sh STANDARDS
+These functions are not part of the
+.St -p1003.1
+specification and should not be used where portability is desired.
+.Sh HISTORY
+These functions first appeared in HP-UX.