man7.org > Linux > man-pages

Linux/UNIX system programming training

id_t(3type) — Linux manual page

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | STANDARDS | HISTORY | NOTES | SEE ALSO | COLOPHON 

id_t(3type)                                                  id_t(3type)

NAME         top

       pid_t, uid_t, gid_t, id_t - process/user/group identifier

LIBRARY         top

       Standard C library (libc)

SYNOPSIS         top

       #include <sys/types.h>

       typedef /* ... */ pid_t;
       typedef /* ... */ uid_t;
       typedef /* ... */ gid_t;
       typedef /* ... */ id_t;

DESCRIPTION         top

       pid_t is a type used for storing process IDs, process group IDs,
       and session IDs.  It is a signed integer type.

       uid_t is a type used to hold user IDs.  It is an integer type.

       gid_t is a type used to hold group IDs.  It is an integer type.

       id_t is a type used to hold a general identifier.  It is an
       integer type that can be used to contain a pid_t, uid_t, or
       gid_t.

STANDARDS         top

       POSIX.1-2008.

HISTORY         top

       POSIX.1-2001.

NOTES         top

       The following headers also provide pid_t: <fcntl.h>, <sched.h>,
       <signal.h>, <spawn.h>, <sys/msg.h>, <sys/sem.h>, <sys/shm.h>,
       <sys/wait.h>, <termios.h>, <time.h>, <unistd.h>, and <utmpx.h>.

       The following headers also provide uid_t: <pwd.h>, <signal.h>,
       <stropts.h>, <sys/ipc.h>, <sys/stat.h>, and <unistd.h>.

       The following headers also provide gid_t: <grp.h>, <pwd.h>,
       <signal.h>, <stropts.h>, <sys/ipc.h>, <sys/stat.h>, and
       <unistd.h>.

       The following header also provides id_t: <sys/resource.h>.

SEE ALSO         top

       chown(2), fork(2), getegid(2), geteuid(2), getgid(2),
       getgroups(2), getpgid(2), getpid(2), getppid(2), getpriority(2),
       getpwnam(3), getresgid(2), getresuid(2), getsid(2), gettid(2),
       getuid(2), kill(2), pidfd_open(2), sched_setscheduler(2),
       waitid(2), getgrnam(3), sigqueue(3), credentials(7)

COLOPHON         top

       This page is part of the man-pages (Linux kernel and C library
       user-space interface documentation) project.  Information about
       the project can be found at 
       ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report
       for this manual page, see
       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
       This page was obtained from the tarball man-pages-6.9.1.tar.gz
       fetched from
       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
       2024-06-26.  If you discover any rendering problems in this HTML
       version of the page, or you believe there is a better or more up-
       to-date source for the page, or you have corrections or
       improvements to the information in this COLOPHON (which is not
       part of the original manual page), send a mail to
       [email protected]

Linux man-pages 6.9.1          2024-05-02                    id_t(3type)

HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface.

For details of in-depth Linux/UNIX system programming training courses that I teach, look here.

Hosting by jambit GmbH.

Cover of TLPI