104 lines
2.9 KiB
Groff
104 lines
2.9 KiB
Groff
.\" Copyright (c) 2000
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.\" Sheldon Hearn. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES
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.\"
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.\" $FreeBSD$
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.\"
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.Dd April 13, 2001
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.Dt SETRESUID 2
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.Os
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.Sh NAME
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.Nm getresgid ,
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.Nm getresuid ,
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.Nm setresgid ,
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.Nm setresuid
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.Nd "get or set real, effective and saved user or group ID"
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.Fd #include <sys/types.h>
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.Fd #include <unistd.h>
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.Ft int
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.Fn getresgid "gid_t *rgid" "gid_t *egid" "gid_t *sgid"
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.Ft int
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.Fn getresuid "uit_t *ruid" "uid_t *euid" "uid_t *suid"
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.Ft int
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.Fn setresgid "gid_t rgid" "gid_t egid" "gid_t sgid"
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.Ft int
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.Fn setresuid "uid_t ruid" "uid_t euid" "uid_t suid"
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.Sh DESCRIPTION
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The
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.Fn setresuid
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system call sets the real,
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effective and saved user IDs of the current process.
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The analogous
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.Fn setresgid
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sets the real, effective and saved group IDs.
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.Pp
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Privileged processes may set these IDs
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to arbitrary values.
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Unprivileged processes are restricted
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in that each of the new IDs must match one of the current IDs.
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.Pp
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Passing -1 as an argument causes the corresponding value
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to remain unchanged.
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.Pp
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The
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.Fn getresgid
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and
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.Fn getresuid
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calls retrieve the real, effective, and saved group and user IDs of
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the current process, respectively.
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.Sh RETURN VALUES
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These functions return the value 0 if successful;
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otherwise the value -1 is returned
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and the global variable
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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.Bl -tag -width Er
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.It Bq Er EPERM
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The calling process was not privileged
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and tried to change one or more IDs to a value
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which was not the current real ID, the current effective ID
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nor the current saved ID.
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.It Bq Er EFAULT
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An address passed to
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.Fn getresgid
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or
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.Fn getresuid
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was invalid.
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.El
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.Sh SEE ALSO
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.Xr getegid 2 ,
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.Xr geteuid 2 ,
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.Xr getgid 2 ,
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.Xr getuid 2 ,
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.Xr isssetugid 2 ,
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.Xr setgid 2 ,
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.Xr setregid 2 ,
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.Xr setreuid 2 ,
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.Xr setuid 2 ,
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.Sh STANDARDS
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These system calls are not available on many platforms.
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They exist in
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.Fx
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to support Linux binaries linked against GNU libc2.
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.Sh HISTORY
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These system calls first appeared in HP-UX.
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