setuser_privileges - set user identity

#include <setuserid.h>

int setuser_privileges(uid_t uid, gid_t gid, char* user);

setuserid_privileges sets the effective user ID to uid, effective group ID to gid, supplementary groups of the user user to its uid, gid obtained from passwd(5) and group(5) databases. It uses setuid(2), setgid(2), setgroups(2), getpwnam(3), getgrent(3).

setuser_privileges returns -1 on failure, 0 on success

setuid(2) setgid(2) setgroups(2) qgetpwnam(3), qgetpwuid(3), qgetpwnam_r(3) qgetpwuid_r(3), qgetgrnam(3), qgetgrgid(3), qgetgrnam_r(3), qgetgrgid_r(3), qgetpwent(3), qsetpwent(3), qendpwent(3), qgetgrent(3), qsetgrent(3), qendgrent(3), grpscan(3), grpscan(3), setuserid(3),