projects / thirdparty / man-pages.git / blame
| Commit | Line | Data |
|---|---|---|
| fea681da MK |
1 | .\" Copyright (c) 1999 Andries Brouwer (aeb@cwi.nl), 1 Nov 1999 |
| 2 | .\" | |
| 3 | .\" Permission is granted to make and distribute verbatim copies of this | |
| 4 | .\" manual provided the copyright notice and this permission notice are | |
| 5 | .\" preserved on all copies. | |
| 6 | .\" | |
| 7 | .\" Permission is granted to copy and distribute modified versions of this | |
| 8 | .\" manual under the conditions for verbatim copying, provided that the | |
| 9 | .\" entire resulting derived work is distributed under the terms of a | |
| 10 | .\" permission notice identical to this one. | |
| c13182ef | 11 | .\" |
| fea681da MK |
12 | .\" Since the Linux kernel and libraries are constantly changing, this |
| 13 | .\" manual page may be incorrect or out-of-date. The author(s) assume no | |
| 14 | .\" responsibility for errors or omissions, or for damages resulting from | |
| 15 | .\" the use of the information contained herein. The author(s) may not | |
| 16 | .\" have taken the same level of care in the production of this manual, | |
| 17 | .\" which is licensed free of charge, as they might when working | |
| 18 | .\" professionally. | |
| c13182ef | 19 | .\" |
| fea681da MK |
20 | .\" Formatted or processed versions of this manual, if unaccompanied by |
| 21 | .\" the source, must acknowledge the copyright and authors of this work. | |
| 22 | .\" | |
| 23 | .\" 1999-11-10: Merged text taken from the page contributed by | |
| 24 | .\" Reed H. Petty (rhp@draper.net) | |
| 25 | .\" | |
| bd16963c | 26 | .TH VFORK 2 2009-06-21 "Linux" "Linux Programmer's Manual" |
| fea681da MK |
27 | .SH NAME |
| 28 | vfork \- create a child process and block parent | |
| 29 | .SH SYNOPSIS | |
| 30 | .B #include <sys/types.h> | |
| 31 | .br | |
| 32 | .B #include <unistd.h> | |
| 33 | .sp | |
| 34 | .B pid_t vfork(void); | |
| cc4615cc MK |
35 | .sp |
| 36 | .in -4n | |
| 37 | Feature Test Macro Requirements for glibc (see | |
| 38 | .BR feature_test_macros (7)): | |
| 39 | .in | |
| 40 | .sp | |
| 41 | .BR vfork (): | |
| 42 | _BSD_SOURCE || _XOPEN_SOURCE\ >=\ 500 | |
| 8c87824d MK |
43 | .SH DESCRIPTION |
| 44 | .SS "Standard Description" | |
| f9f81237 | 45 | (From POSIX.1) |
| fea681da | 46 | The |
| bed66765 | 47 | .BR vfork () |
| fea681da | 48 | function has the same effect as |
| 0bfa087b | 49 | .BR fork (2), |
| d9bfdb9c | 50 | except that the behavior is undefined if the process created by |
| bed66765 | 51 | .BR vfork () |
| c13182ef MK |
52 | either modifies any data other than a variable of type |
| 53 | .I pid_t | |
| 70cbdedf | 54 | used to store the return value from |
| bed66765 | 55 | .BR vfork (), |
| fea681da | 56 | or returns from the function in which |
| bed66765 | 57 | .BR vfork () |
| fea681da | 58 | was called, or calls any other function before successfully calling |
| 0bfa087b | 59 | .BR _exit (2) |
| fea681da | 60 | or one of the |
| d806e103 | 61 | .BR exec (3) |
| fea681da | 62 | family of functions. |
| 8c87824d | 63 | .SS "Linux Description" |
| bed66765 | 64 | .BR vfork (), |
| fea681da MK |
65 | just like |
| 66 | .BR fork (2), | |
| 67 | creates a child process of the calling process. | |
| 68 | For details and return value and errors, see | |
| 69 | .BR fork (2). | |
| 70 | .PP | |
| bed66765 | 71 | .BR vfork () |
| fea681da MK |
72 | is a special case of |
| 73 | .BR clone (2). | |
| 74 | It is used to create new processes without copying the page tables of | |
| c13182ef | 75 | the parent process. |
| 600c9aa9 | 76 | It may be useful in performance-sensitive applications |