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(freebsd section 3)
man page for setruid

SETRUID(3)						   BSD Library Functions Manual 						SETRUID(3)

NAME
setruid, setrgid -- set user and group ID LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <unistd.h> int setruid(uid_t ruid); int setrgid(gid_t rgid); DESCRIPTION
The setruid() function (setrgid()) sets the real user ID (group ID) of the current process. RETURN VALUES
Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the error. COMPATIBILITY
The use of these calls is not portable. Their use is discouraged; they will be removed in the future. ERRORS
The functions fail if: [EPERM] The user is not the super user and the ID specified is not the real or effective ID. SEE ALSO
getgid(2), getuid(2), setegid(2), seteuid(2), setgid(2), setuid(2) HISTORY
The setruid() and setrgid() syscalls appeared in 4.2BSD and were dropped in 4.4BSD. BSD
June 2, 1993 BSD

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