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@(#)setuid.2 8.1 (Berkeley) 6/4/93
$Id$
.Dd June 4, 1993 .Dt SETUID 2 .Os BSD 4.2 .Sh NAME .Nm setuid , .Nm seteuid , .Nm setgid , .Nm setegid , .Nd set user and group ID .Sh SYNOPSIS .Fd #include <sys/types.h> .Fd #include <unistd.h> .Ft int .Fn setuid "uid_t uid" .Ft int .Fn seteuid "uid_t euid" .Ft int .Fn setgid "gid_t gid" .Ft int .Fn setegid "gid_t egid" .Sh DESCRIPTION The .Fn setuid function sets the real and effective user IDs and the saved set-user-ID of the current process to the specified value. The .Fn setuid function is permitted if the specified ID is equal to the real user ID of the process, or if the effective user ID is that of the super user.
p The .Fn setgid function sets the real and effective group IDs and the saved set-group-ID of the current process to the specified value. The .Fn setgid function is permitted if the specified ID is equal to the real group ID of the process, or if the effective user ID is that of the super user.
p The .Fn seteuid function
q Fn 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 .Xr intro 2 and .Xr 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.
p .Sh RETURN VALUES Upon success, these functions return 0; otherwise -1 is returned.
p 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. .Sh SEE ALSO .Xr getuid 2 , .Xr getgid 2 .Sh STANDARDS The .Fn setuid and .Fn setgid functions are compliant with the .St -p1003.1-88 specification with .Li _POSIX_SAVED_IDS not defined. The .Fn seteuid and .Fn setegid functions are extensions based on the .Tn POSIX concept of .Li _POSIX_SAVED_IDS , and have been proposed for a future revision of the standard. .Sh HISTORY A .Fn setuid and a setgid function call appeared in .At v7 .