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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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@released
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*/
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/** @def _WSTOPPED
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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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@released
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*/
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/** @def WIFSTOPPED(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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@externallyDefinedApi
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*/
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/** @def WSTOPSIG(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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@externallyDefinedApi
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*/
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/** @def WIFSIGNALED(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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@externallyDefinedApi
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*/
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/** @def WTERMSIG(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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@externallyDefinedApi
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*/
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/** @def WIFEXITED(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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@externallyDefinedApi
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*/
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/** @def WEXITSTATUS(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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@externallyDefinedApi
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*/
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/** @def WIFCONTINUED(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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@externallyDefinedApi
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*/
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/** @def WCOREDUMP(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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@externallyDefinedApi
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*/
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/** @def W_EXITCODE(ret, sig)
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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 W_STOPCODE(sig)
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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 WIFTERMINATED(x)
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Macros to test the termination code 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 WTERMINATESTATUS(x)
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Macros to test the termination code 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 WIFPANICED(x)
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Macros to test the panic code 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 WPANICCODE(x)
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Macros to test the panic code 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 WNOHANG
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Don't hang in wait.
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@publishedAll
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@externallyDefinedApi
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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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@externallyDefinedApi
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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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@externallyDefinedApi
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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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@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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@released
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*/
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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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@publishedAll
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@released
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*/
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