setegid - set the effective group ID
int setegid(gid_t gid);
If gid is equal to the real group ID or the saved set-group-ID, or if the process has appropriate privileges, setegid() shall set the effective group ID of the calling process to gid; the real group ID, saved set-group-ID, and any supplementary group IDs shall remain unchanged.
The setegid() function shall not affect the supplementary group list in any way.
Upon successful completion, 0 shall be returned; otherwise, -1 shall be returned and errno set to indicate the error.
The setegid() function shall fail if:
- The value of the gid argument is invalid and is not supported by the implementation.
- The process does not have appropriate privileges and gid does not match the real group ID or the saved set-group-ID.
Refer to the RATIONALE section in setuid().
exec(), getegid(), geteuid(), getgid(), getuid(), seteuid(), setgid(), setregid(), setreuid(), setuid(), the Base Definitions volume of IEEE Std 1003.1-2001, <sys/types.h>, <unistd.h>
First released in Issue 6. Derived from the IEEE P1003.1a draft standard.