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AIX Version 4.3 Base Operating System and Extensions Technical Reference, Volume 2
setgid, setrgid, setegid, or setregid Subroutine
Purpose
Sets the process group IDs.
Library
Standard C Library (libc.a)
Syntax
#include <unistd.h>
int setgid (GID)
gid_t GID;
int setrgid (RGID)
gid_t RGID;
int setegid (EGID)
gid_t EGID;
int setregid (RGID, EGID)
gid_t RGID;
gid_t EGID;
Description
The setgid, setrgid, setegid, and setregid subroutines set the process group IDs of the calling process. The following semantics are supported:
setgid |
If the effective user ID of the process is the root user, the process's real, effective, and saved group IDs are set to the value of the GID parameter. Otherwise, the process effective group ID is reset if the GID parameter is equal to either the current real or saved group IDs, or one of its supplementary group IDs. Supplementary group IDs of the calling process are not changed. |
setegid |
The process effective group ID is reset if one of the following conditions is met:
- The EGID parameter is equal to either the current real or saved group IDs.
- The EGID parameter is equal to one of its supplementary group IDs.
- The effective user ID of the process is the root user.
|
setrgid |
The EPERM error code is always returned. |
setregid |
The RGID and EGID parameters can have one of the following relationships:
RGID != EGID |
If the EGID parameter is equal to either the process's real or saved group IDs, the process effective group ID is set to the EGID parameter. Otherwise, the EPERM error code is returned. |
RGID= = EGID |
If the effective user ID of the process is the root user, the process's
real and effective
group IDs are set to the EGID parameter. If the EGID parameter is equal to the process's real or saved group IDs, the process effective group ID is set to EGID. Otherwise, the EPERM error code is returned. |
|
The setegid, setrgid, and setregid subroutines are thread-safe.
Parameters
GID |
Specifies the value of the group ID to set. |
RGID |
Specifies the value of the real group ID to set. |
EGID |
Specifies the value of the effective group ID to set. |
Return Values
0 |
Indicates that the subroutine was successful. |
-1 |
Indicates the subroutine failed. The errno global variable is set to indicate the error. |
Error Codes
If either the setgid or setegid subroutine fails, one or more of the following are returned:
EPERM |
Indicates the process does not have appropriate privileges and the GID or EGID parameter is not equal to either the real or saved group IDs of the process. |
EINVAL |
Indicates the value of the GID or EGID parameter is invalid. |
Implementation Specifics
These subroutines are part of Base Operating System (BOS) Runtime.
The operating system does not support setuid or setgid shell scripts.
Related Information
The getgid subroutine, getgroups subroutine, setgroups subroutine, setuid subroutine.
The setgroups command.
List of Security and Auditing Subroutines, Subroutines Overview in AIX Version 4.3 General Programming Concepts: Writing and Debugging Programs.
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