Functions of managing the login and the identifier

Book excerpt: What is the login - getlogin! The micro-course contains information about functions of managing the logging name and the user identifier. Keywords: getlogin, getuid, geteuid Functions of managing the login and the identifier The functions of the glibc library – users The getlogin function User identifiers The getuid, geteuid functions The setuid, seteuid, setreuid functions Functions of the glibc library – groups The getgroups, setgroups functions The getgid, getegid functions The setgid, setegid, setregid functions The getpwnam function The getpwuid function The fgetpwent function The getpwent, setpwent, endpwent, putpwent functions The getpwent function The setpwent function The endpwent function The putpwent function The getpw function The mechanism of /etc/shadow support