| .\" Copyright (c) 2020-2022 by Alejandro Colomar <alx@kernel.org> |
| .\" and Copyright (c) 2020 by Michael Kerrisk <mtk.manpages@gmail.com> |
| .\" |
| .\" SPDX-License-Identifier: Linux-man-pages-copyleft |
| .\" |
| .\" |
| .TH id_t 3type (date) "Linux man-pages (unreleased)" |
| .SH NAME |
| pid_t, uid_t, gid_t, id_t \- process/user/group identifier |
| .SH LIBRARY |
| Standard C library |
| .RI ( libc ) |
| .SH SYNOPSIS |
| .nf |
| .B #include <sys/types.h> |
| .P |
| .BR typedef " /* ... */ " pid_t; |
| .BR typedef " /* ... */ " uid_t; |
| .BR typedef " /* ... */ " gid_t; |
| .BR typedef " /* ... */ " id_t; |
| .fi |
| .SH DESCRIPTION |
| .I pid_t |
| is a type used for storing process IDs, process group IDs, and session IDs. |
| It is a signed integer type. |
| .P |
| .I uid_t |
| is a type used to hold user IDs. |
| It is an integer type. |
| .P |
| .I gid_t |
| is a type used to hold group IDs. |
| It is an integer type. |
| .P |
| .I id_t |
| is a type used to hold a general identifier. |
| It is an integer type that can be used to contain a |
| .IR pid_t , |
| .IR uid_t , |
| or |
| .IR gid_t . |
| .SH STANDARDS |
| POSIX.1-2008. |
| .SH HISTORY |
| POSIX.1-2001. |
| .SH NOTES |
| The following headers also provide |
| .IR pid_t : |
| .IR <fcntl.h> , |
| .IR <sched.h> , |
| .IR <signal.h> , |
| .IR <spawn.h> , |
| .IR <sys/msg.h> , |
| .IR <sys/sem.h> , |
| .IR <sys/shm.h> , |
| .IR <sys/wait.h> , |
| .IR <termios.h> , |
| .IR <time.h> , |
| .IR <unistd.h> , |
| and |
| .IR <utmpx.h> . |
| .P |
| The following headers also provide |
| .IR uid_t : |
| .IR <pwd.h> , |
| .IR <signal.h> , |
| .IR <stropts.h> , |
| .IR <sys/ipc.h> , |
| .IR <sys/stat.h> , |
| and |
| .IR <unistd.h> . |
| .P |
| The following headers also provide |
| .IR gid_t : |
| .IR <grp.h> , |
| .IR <pwd.h> , |
| .IR <signal.h> , |
| .IR <stropts.h> , |
| .IR <sys/ipc.h> , |
| .IR <sys/stat.h> , |
| and |
| .IR <unistd.h> . |
| .P |
| The following header also provides |
| .IR id_t : |
| .IR <sys/resource.h> . |
| .SH SEE ALSO |
| .BR chown (2), |
| .BR fork (2), |
| .BR getegid (2), |
| .BR geteuid (2), |
| .BR getgid (2), |
| .BR getgroups (2), |
| .BR getpgid (2), |
| .BR getpid (2), |
| .BR getppid (2), |
| .BR getpriority (2), |
| .BR getpwnam (3), |
| .BR getresgid (2), |
| .BR getresuid (2), |
| .BR getsid (2), |
| .BR gettid (2), |
| .BR getuid (2), |
| .BR kill (2), |
| .BR pidfd_open (2), |
| .BR sched_setscheduler (2), |
| .BR waitid (2), |
| .BR getgrnam (3), |
| .BR sigqueue (3), |
| .BR credentials (7) |
