| [9] | 1 | .\" Copyright (c) 1980 Regents of the University of California.
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| 2 | .\" All rights reserved. The Berkeley software License Agreement
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| 3 | .\" specifies the terms and conditions for redistribution.
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| 4 | .\"
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| 5 | .\" @(#)setreuid.2 6.1 (Berkeley) 5/9/85
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| 6 | .\"
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| 7 | .TH SETUID 2 "May 9, 1985"
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| 8 | .UC 4
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| 9 | .SH NAME
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| 10 | setuid, seteuid, setgid, setegid \- set (effective) user or group ID's
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| 11 | .SH SYNOPSIS
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| 12 | .nf
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| 13 | .ft B
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| 14 | #include <sys/types.h>
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| 15 |
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| 16 | int setuid(uid_t \fIuid\fP)
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| 17 | int seteuid(uid_t \fIeuid\fP)
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| 18 | int setgid(gid_t \fIgid\fP)
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| 19 | int setegid(gid_t \fIegid\fP)
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| 20 | .ft R
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| 21 | .fi
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| 22 | .SH DESCRIPTION
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| 23 | .B Setuid
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| 24 | sets the real and effective user ID's of the
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| 25 | current process to
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| 26 | .IR uid .
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| 27 | Unprivileged users may only change both user ID's
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| 28 | to the real user ID; only the super-user may
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| 29 | make other changes.
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| 30 | .B Setgid
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| 31 | does the same for the real and effective group ID's.
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| 32 | .PP
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| 33 | Minix-vmd
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| 34 | allows an unprivileged user to change ID's to the original real or effective
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| 35 | ID as they were at the time the process was executed.
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| 36 | .B Setgid
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| 37 | may also set the group ID's to any of the additional group ID's.
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| 38 | If one of the
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| 39 | remembered user ID's was 0 then any user or group ID may be chosen.
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| 40 | .SH "RETURN VALUE
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| 41 | Upon successful completion, a value of 0 is returned. Otherwise,
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| 42 | a value of \-1 is returned and \fBerrno\fP is set to indicate the error.
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| 43 | .SH "ERRORS
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| 44 | .TP 15
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| 45 | [EPERM]
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| 46 | The current process is not the super-user and a change
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| 47 | other than one of the allowed changes was attempted.
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| 48 | .SH "SEE ALSO"
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| 49 | .BR getuid (2),
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| 50 | .BR geteuid (2),
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| 51 | .BR getgid (2).
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| 52 | .BR getegid (2).
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