projects / thirdparty / man-pages.git / blame
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1 | .\" Hey Emacs! This file is -*- nroff -*- source. |
| 2 | .\" | |
| 3 | .\" Copyright 2003 Abhijit Menon-Sen <ams@wiw.org> | |
| 4 | .\" Permission is granted to make and distribute verbatim copies of this | |
| 5 | .\" manual provided the copyright notice and this permission notice are | |
| 6 | .\" preserved on all copies. | |
| 7 | .\" | |
| 8 | .\" Permission is granted to copy and distribute modified versions of this | |
| 9 | .\" manual under the conditions for verbatim copying, provided that the | |
| 10 | .\" entire resulting derived work is distributed under the terms of a | |
| 11 | .\" permission notice identical to this one. | |
| 12 | .\" | |
| 13 | .\" Since the Linux kernel and libraries are constantly changing, this | |
| 14 | .\" manual page may be incorrect or out-of-date. The author(s) assume no | |
| 15 | .\" responsibility for errors or omissions, or for damages resulting from | |
| 16 | .\" the use of the information contained herein. The author(s) may not | |
| 17 | .\" have taken the same level of care in the production of this manual, | |
| 18 | .\" which is licensed free of charge, as they might when working | |
| 19 | .\" professionally. | |
| 20 | .\" | |
| 21 | .\" Formatted or processed versions of this manual, if unaccompanied by | |
| 22 | .\" the source, must acknowledge the copyright and authors of this work. | |
| 23 | .\" | |
| 24 | .TH GETTID 2 "2003-02-01" "Linux 2.4.20" "Linux Programmer's Manual" | |
| 25 | .SH NAME | |
| 26 | gettid \- get thread identification | |
| 27 | .SH SYNOPSIS | |
| 16718a1c | 28 | .nf |
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29 | .B #include <sys/types.h> |
| 30 | .br | |
| 31 | .B #include <linux/unistd.h> | |
| 6e2d1c54 | 32 | .br |
| 527d9933 | 33 | .B #include <errno.h> |
| fea681da | 34 | .sp |
| cb2431bf | 35 | .B _syscall0(pid_t, gettid) |
| 16718a1c | 36 | /* Using \fBsyscall\fP(2) may be preferable; see \fBintro\fP(2) */ |
| fea681da | 37 | .sp |
| 16718a1c | 38 | .fi |
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39 | .B pid_t gettid(void); |
| 40 | .SH DESCRIPTION | |
| e511ffb6 | 41 | \fBgettid\fP() returns the thread ID of the current process. This is equal |
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42 | to the process ID (as returned by |
| 43 | .BR getpid (2)), | |
| 44 | unless the process is part of a thread group (created by specifying | |
| 45 | the CLONE_THREAD flag to the | |
| 46 | .BR clone (2) | |
| 47 | system call). All processes in the same thread group | |
| 48 | have the same PID, but each one has a unique TID. | |
| 49 | .SH "RETURN VALUE" | |
| 50 | On success, returns the thread ID of the current process. | |
| 51 | .SH ERRORS | |
| 52 | This call is always successful. | |
| 53 | .SH "CONFORMING TO" | |
| e511ffb6 | 54 | \fBgettid\fP() is Linux specific and should not be used in programs that |
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55 | are intended to be portable. |
| 56 | .SH "SEE ALSO" | |
| 57 | .BR clone (2), | |
| 58 | .BR fork (2), | |
| 59 | .BR getpid (2) |