freebsd-dev/lib/libc/sys/setresuid.2
Alexey Zelkin 4f79a4117a Use `Er' variable to define first column width in ERRORS section. It was
initially suggested by mdoc(7) style, but was broken over the years
2000-05-04 13:09:25 +00:00

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.\" Copyright (c) 2000
.\" Sheldon Hearn. All rights reserved.
.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" $FreeBSD$
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.Dd January 17, 2000
.Dt SETRESUID 2
.Os
.Sh NAME
.Nm setresgid ,
.Nm setresuid
.Nd set real, effective and saved user or group ID
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.Fd #include <sys/types.h>
.Fd #include <unistd.h>
.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
.Nm setresuid
system call sets the real,
effective and saved user IDs of the current process.
The analogous
.Nm 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.
.Sh RETURN VALUES
These functions return the value 0 if successful;
otherwise the value -1 is returned
and the global variable
.Va errno
is set to indicate the error.
.Sh ERRORS
.Bl -tag -width Er
.It 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.
.Sh SEE ALSO
.Xr getegid 2 ,
.Xr geteuid 2 ,
.Xr getgid 2 ,
.Xr getuid 2 ,
.Xr isssetugid 2 ,
.Xr setgid 2 ,
.Xr setregid 2 ,
.Xr setreuid 2 ,
.Xr setuid 2 ,
.Sh STANDARDS
These system calls are not available on many platforms.
They exist in
.Fx
to support Linux binaries linked against GNU libc2.
.Sh HISTORY
These system calls first appeared in HP-UX.