author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 01 Apr 2010 00:15:09 +0300 | |
branch | RCL_3 |
changeset 15 | 18da5738c9b6 |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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/** @file ../include/sys/wait.h |
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@internalComponent |
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*/ |
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/** @fn wait(int *status) |
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@param status |
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Note: This description also covers the following functions - |
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waitpid() |
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@return If wait returns due to a stopped |
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or terminated child process, the process ID of the child |
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is returned to the calling process. |
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Otherwise, a value of -1 |
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is returned and errno is set to indicate the error. If wait4 , wait3 , |
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or waitpid returns due to a stopped |
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or terminated child process, the process ID of the child |
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is returned to the calling process. |
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If there are no children not previously awaited, |
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-1 is returned with errno set to ECHILD . |
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Otherwise, if WNOHANG is specified and there are |
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no stopped or exited children, |
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0 is returned. |
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If an error is detected or a caught signal aborts the call, |
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a value of -1 |
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is returned and errno is set to indicate the error. |
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The wait function suspends execution of its calling process until status information is available for a terminated child process, |
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or a signal is received. |
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On return from a successful wait call, |
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the status area contains termination information about the process that exited |
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as defined below. |
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The wpid argument specifies the set of child processes for which to wait. |
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If wpid is -1, the call waits for any child process. |
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If wpid is 0, |
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the call waits for any child process in the process group of the caller. |
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If wpid is greater than zero, the call waits for the process with process id wpid . |
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If wpid is less than -1, the call waits for any process whose process group id |
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equals the absolute value of wpid . |
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The waitpid function is identical to wait4 with an rusage value of zero. |
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Note: |
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The waitpid function waits for a process ID which is obtained using a |
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non-standard API popen3 |
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@see _exit() |
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@see exit() |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @fn waitpid(pid_t wpid, int *status, int options) |
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@param wpid |
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@param status |
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@param options |
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Refer to wait() for the documentation |
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@see _exit() |
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@see exit() |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @def _W_INT(w) |
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Macros to test the exit status returned by wait and extract the relevant values. Convert union wait to int. |
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@publishedAll |
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@released |
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*/ |
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/** @def WCOREFLAG |
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Macros to test the exit status returned by wait and extract the relevant values. |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @def _WSTATUS(x) |
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Macros to test the exit status returned by wait and extract the relevant values. |
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@publishedAll |
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*/ |
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/** @def WPANICCODE(x) |
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*/ |
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/** @def WNOHANG |
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Don't hang in wait. |
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@publishedAll |
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*/ |
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/** @def WUNTRACED |
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Tell about stopped, untraced children. |
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@publishedAll |
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*/ |
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/** @def WCONTINUED |
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Report a job control continued process. |
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@publishedAll |
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*/ |
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/** @def WAIT_ANY |
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Any process. Tokens for special values of the pid parameter to wait4. |
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@released |
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*/ |
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/** @def WCOREFLAG |
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Macros to test the exit status returned by wait and extract the relevant values. |
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@released |
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/** @def WLINUXCLONE |
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Wait for kthread spawned from linux_clone. |
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@publishedAll |
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@released |
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*/ |
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/** @def WAIT_MYPGRP |
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Tokens for special values of the pid parameter to wait4. Any process in my process group. |
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@released |
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*/ |
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