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87 lines
2.8 KiB
Plaintext
87 lines
2.8 KiB
Plaintext
.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
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.TH "SETREGID" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
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.\" setregid
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.SH NAME
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setregid \- set real and effective group IDs
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.SH SYNOPSIS
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.LP
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\fB#include <unistd.h>
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.br
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.sp
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int setregid(gid_t\fP \fIrgid\fP\fB, gid_t\fP \fIegid\fP\fB); \fP
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\fB
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.br
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\fP
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.SH DESCRIPTION
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.LP
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The \fIsetregid\fP() function shall set the real and effective group
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IDs of the calling process.
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.LP
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If \fIrgid\fP is -1, the real group ID shall not be changed; if \fIegid\fP
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is -1, the effective group ID shall not be
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changed.
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.LP
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The real and effective group IDs may be set to different values in
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the same call.
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.LP
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Only a process with appropriate privileges can set the real group
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ID and the effective group ID to any valid value.
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.LP
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A non-privileged process can set either the real group ID to the saved
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set-group-ID from one of the \fIexec\fP family of functions, or the
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effective group ID to the saved set-group-ID or the real group
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ID.
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.LP
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Any supplementary group IDs of the calling process remain unchanged.
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.SH RETURN VALUE
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.LP
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Upon successful completion, 0 shall be returned. Otherwise, -1 shall
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be returned and \fIerrno\fP set to indicate the error, and
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neither of the group IDs are changed.
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.SH ERRORS
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.LP
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The \fIsetregid\fP() function shall fail if:
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.TP 7
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.B EINVAL
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The value of the \fIrgid\fP or \fIegid\fP argument is invalid or out-of-range.
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.TP 7
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.B EPERM
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The process does not have appropriate privileges and a change other
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than changing the real group ID to the saved set-group-ID,
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or changing the effective group ID to the real group ID or the saved
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set-group-ID, was requested.
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.sp
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.LP
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\fIThe following sections are informative.\fP
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.SH EXAMPLES
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.LP
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None.
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.SH APPLICATION USAGE
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.LP
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If a set-group-ID process sets its effective group ID to its real
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group ID, it can still set its effective group ID back to the
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saved set-group-ID.
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.SH RATIONALE
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.LP
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None.
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.SH FUTURE DIRECTIONS
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.LP
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None.
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.SH SEE ALSO
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.LP
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\fIexec\fP() , \fIgetegid\fP() , \fIgeteuid\fP() , \fIgetgid\fP()
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, \fIgetuid\fP() ,
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\fIsetegid\fP() , \fIseteuid\fP() , \fIsetgid\fP() , \fIsetreuid\fP()
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, \fIsetuid\fP() , the
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Base Definitions volume of IEEE\ Std\ 1003.1-2001, \fI<unistd.h>\fP
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.SH COPYRIGHT
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Portions of this text are reprinted and reproduced in electronic form
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from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
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-- Portable Operating System Interface (POSIX), The Open Group Base
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Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
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Electrical and Electronics Engineers, Inc and The Open Group. In the
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event of any discrepancy between this version and the original IEEE and
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The Open Group Standard, the original IEEE and The Open Group Standard
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is the referee document. The original Standard can be obtained online at
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http://www.opengroup.org/unix/online.html .
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