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setregid(2) [ultrix man page]

setregid(2)							System Calls Manual						       setregid(2)

Name
       setregid - set real and effective group ID

Syntax
       setregid(rgid, egid)
       int rgid, egid;

Description
       The real and effective group ID's of the current process are set to the arguments.

       Supplying a value of -1 for either the real or effective group ID forces the system to substitute the current ID for the -1 parameter.

Environment
       BSD
       If  the	process is superuser, or and matches with the real group ID, the effective group ID, or the saved set-group-id (as described in ),
       then the real, effective, and saved set-group-id are set to and respectively.

       POSIX
       SYSTEM-FIVE
       When your program is compiled in POSIX or SYSTEM-FIVE mode, the following semantics apply when using the function.

       If the process is the superuser, the real, effective, and saved set-group-id (as described in ) are set to and respectively.

       If the process is not the superuser, but the and matches the real group ID, the effective group ID (only in SYSTEM-FIVE	and  BSD  environ-
       ment), or the saved set-group-id, then the effective ID is set to The real group ID and the saved set-group-id are left unchanged.

Return Values
       Upon successful completion, a value of zero (0) is returned.  Otherwise, a value of -1 is returned, and errno is set to indicate the error.

Diagnostics
       [EPERM]	      The  current process is not the superuser and the and specified does not match with the real group ID or the effective group
		      ID (only in SYSTEM-FIVE and BSD environment) or the saved set-group-id.

See Also
       getgid(2), setreuid(2), setgid(3)

																       setregid(2)

Check Out this Related Man Page

setregid(2)							System Calls Manual						       setregid(2)

NAME
setregid - Sets the real and effective group ID SYNOPSIS
#include <unistd.h> setregid( gid_t rgid, gid_t egid ); STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: setregid(): XPG4-UNIX Refer to the standards(5) reference page for more information about industry standards and associated tags. PARAMETERS
Specifies the new real group ID. Specifies the new effective group ID. DESCRIPTION
The setregid() function sets the real group ID of the current process to the value specified by the rgid parameter, and sets the effective group ID to the value specified by the egid parameter. If the value of rgid is -1, the real group ID is not changed; if the value of 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. Unprivileged users may change the effective group ID to the real group ID; only the superuser may make other changes. Any supplementary group IDs of the calling process remain unchanged. RETURN VALUES
Upon successful completion, a value of 0 (zero) is returned. Otherwise, a value of -1 is returned and errno is set to indicate the error. ERRORS
The setregid() function sets errno to the specified values for the following conditions: The value of the rgid egid parameter is invalid or out of range. The current process does not have superuser privilege and a change other than changing the effective group ID to the real group ID was specified. RELATED INFORMATION
Functions: getgid(2), setgid(2), setrgid(3), setreuid(2) Standards: standards(5) delim off setregid(2)
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