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OpenDarwin 7.2.1 - man page for setuid (opendarwin section 2)

SETUID(2)			     BSD System Calls Manual				SETUID(2)

NAME
     setuid, seteuid, setgid, setegid -- set user and group ID

SYNOPSIS
     #include <sys/types.h>
     #include <unistd.h>

     int
     setuid(uid_t uid);

     int
     seteuid(uid_t euid);

     int
     setgid(gid_t gid);

     int
     setegid(gid_t egid);

DESCRIPTION
     The setuid() function sets the real and effective user IDs and the saved set-user-ID of the
     current process to the specified value.  The setuid() function is permitted if the effective
     user ID is that of the super user, or if the specified user ID is the same as the effective
     user ID.  If not, but the specified user ID is the same as the real user ID, setuid() will
     set the effective user ID to the real user ID.

     The setgid() function sets the real and effective group IDs and the saved set-group-ID of
     the current process to the specified value.  The setgid() function is permitted if the
     effective user ID is that of the super user, or if the specified group ID is the same as the
     effective group ID.  If not, but the specified group ID is the same as the real group ID,
     setgid() will set the effective group ID to the real group ID.

     The seteuid() function (setegid()) sets the effective user ID (group ID) of the current
     process.  The effective user ID may be set to the value of the real user ID or the saved
     set-user-ID (see intro(2) and execve(2)); in this way, the effective user ID of a set-user-
     ID executable may be toggled by switching to the real user ID, then re-enabled by reverting
     to the set-user-ID value.	Similarly, the effective group ID may be set to the value of the
     real group ID or the saved set-user-ID.

RETURN VALUES
     Upon success, these functions return 0; otherwise -1 is returned.

     If the user is not the super user, or the uid specified is not the real, effective ID, or
     saved ID, these functions return -1.

SEE ALSO
     getuid(2), getgid(2)

STANDARDS
     The setuid() and setgid() functions are compliant with the ISO/IEC 9945-1:1990 (``POSIX.1'')
     specification with _POSIX_SAVED_IDS defined, with the extensions allowed in section B.4.2.2.
     The seteuid() and setegid() functions are extensions based on the POSIX concept of
     _POSIX_SAVED_IDS, and have been proposed for a future revision of the standard.

4.2 Berkeley Distribution		   June 4, 1993 		4.2 Berkeley Distribution


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