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BSD 2.11 - man page for seteuid (bsd section 3)

SETUID(3)				       Library Functions Manual 				    SETUID(3)

NAME
setuid, seteuid, setruid, setgid, setegid, setrgid - set user and group ID
SYNOPSIS
#include <sys/types.h> setuid(uid) seteuid(euid) setruid(ruid) uid_t uid, euid, ruid; setgid(gid) setegid(egid) setrgid(rgid) gid_t gid, egid, rgid;
DESCRIPTION
Setuid (setgid) sets both the real and effective user ID (group ID) of the current process to as specified. Seteuid (setegid) sets the effective user ID (group ID) of the current process. Setruid (setrgid) sets the real user ID (group ID) of the current process. These calls are only permitted to the super-user or if the argument is the real or effective ID.
SEE ALSO
setreuid(2), setregid(2), getuid(2), getgid(2)
DIAGNOSTICS
Zero is returned if the user (group) ID is set; -1 is returned otherwise. 4.2 Berkeley Distribution May 12, 1986 SETUID(3)
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