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SETGID(2) Linux Programmer's Manual SETGID(2)
setgid - set group identity
int setgid(gid_t gid);
setgid sets the effective group ID of the current process. If the caller is the superuser,
the real and saved group ID's are also set.
Under Linux, setgid is implemented like the POSIX version with the _POSIX_SAVED_IDS fea-
ture. This allows a setgid program that is not suid root to drop all of its group privi-
leges, do some un-privileged work, and then re-engage the original effective group ID in a
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
EPERM The user is not the super-user (does not have the CAP_SETGID capability), and gid
does not match the effective group ID or saved set-group-ID of the calling process.
getgid(2), setregid(2), setegid(2)
Linux 2.5 2002-03-09 SETGID(2)
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