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setregid(2) [sunos man page]

setregid(2)							   System Calls 						       setregid(2)

NAME
setregid - set real and effective group IDs SYNOPSIS
#include <unistd.h> int setregid(gid_t rgid, gid_t egid); DESCRIPTION
The setregid() function is used to set the real and effective group IDs of the calling process. If rgid is -1, the real group ID is not changed; if egid is -1, the effective group ID is not changed. The real and effective group IDs may be set to different values in the same call. If the {PRIV_PROC_SETID} privilege is asserted in the effective set of the calling process, the real group ID and the effective group ID can be set to any legal value. If the {PRIV_PROC_SETID} privilege is not asserted in the effective set of the calling process, either the real group ID can be set to the saved set-group-ID from execve(2), or the effective group ID can either be set to the saved set-group-ID or the real group ID. In either case, if the real group ID is being changed (that is, if rgid is not -1), or the effective group ID is being changed to a value not equal to the real group ID, the saved set-group-ID is set equal to the new effective group ID. RETURN VALUES
Upon successful completion, 0 is returned. Otherwise, -1 is returned, errno is set to indicate the error, and neither of the group IDs will be changed. ERRORS
The setregid() function will fail if: EINVAL The value of rgid or egid is less than 0 or greater than UID_MAX (defined in <limits.h>). EPERM The {PRIV_PROC_SETID} privilege is not asserted in the effective set of the calling processes and a change was specified other than changing the real group ID to the saved set-group-ID or changing the effective group ID to the real group ID or the saved group ID. USAGE
If a set-group-ID process sets its effective group ID to its real group ID, it can still set its effective group ID back to the saved set- group-ID. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
execve(2), getgid(2), setreuid(2), setuid(2), attributes(5), privileges(5), standards(5) SunOS 5.10 22 Mar 2004 setregid(2)

Check Out this Related Man Page

SETREGID(2)						      BSD System Calls Manual						       SETREGID(2)

NAME
setregid -- set real and effective group ID's LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <unistd.h> int setregid(gid_t rgid, gid_t egid); DESCRIPTION
This interface is made obsolete by the saved ID functionality in setgid(2) and setegid(2). The real and effective group ID's of the current process are set according to the arguments. If the real group ID is changed, the saved group ID is changed to the new value of the effective group ID. If rgid or egid is -1, the current gid is filled in by the system. Unprivileged users may change the real group ID to the effective group ID, and may change the effective group ID to the real group ID or the saved group ID; only the super-user may make other changes. The setregid() function has been used to swap the real and effective group IDs in set-group-ID programs to temporarily relinquish the set- group-ID value. This purpose is now better served by the use of the setegid() function (see setgid(2)). When setting the real and effective group IDs to the same value, this function is equivalent to the setgid() function. When setting only the effective group ID, this function is equivalent to the setegid() function. RETURN VALUES
Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and errno is set to indicate the error. ERRORS
[EPERM] The current process is not the super-user and a change other than changing the effective group-id to the real group-id was specified. SEE ALSO
getgid(2), setegid(2), setgid(2), setuid(2) HISTORY
The setregid() function call appeared in 4.2BSD. An incompatible version was implemented in 4.4BSD. It was reimplemented in NetBSD 1.2 in a way compatible with 4.3BSD, SunOS and Linux, but should not be used in new code. BSD
January 5, 2001 BSD

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