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SETGID(2) Linux Programmer's Manual SETGID(2) NAME setgid - set group identity SYNOPSIS #include <sys/types.h> #include <unistd.h> int setgid(gid_t 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 _POSIX_SAVED_IDS 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 EINVAL The group ID specified in gid is not valid in this user name- space. EPERM The calling process is not privileged (does not have the CAP_SETGID 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), user_namespaces(7) COLOPHON This page is part of release 3.74 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/. Linux 2014-09-21 SETGID(2)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON
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