NAME
setgid - set group identity SYNOPSIS
#include
#include
int setgid(gidt gid); DESCRIPTION setgid() sets the effective group ID of the calling process. If the caller is the superuser, the real GID and saved set-group-ID are also set. Under Linux, setgid() is implemented like the POSIX version with the
POSIXSAVEDIDS feature. This allows a set-group-ID program that is
not set-user-ID-root to drop all of its group privileges, do some un- privileged work, and then reengage the original effective group ID in a secure manner. RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately. ERRORS EPERM The calling process is not privileged (does not have the CAPSETGID capability), and gid does not match the real group ID
or saved set-group-ID of the calling process. CONFORMING TO
SVr4, POSIX.1-2001. NOTES
The original Linux setgid() system call supported only 16-bit group
IDs. Subsequently, Linux 2.4 added setgid32() supporting 32-bit IDs. The glibc setgid() wrapper function transparently deals with the varia‐ tion across kernel versions. SEE ALSO getgid(2), setegid(2), setregid(2), capabilities(7), credentials(7) COLOPHON
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Linux 2010-11-22 SETGID(2)