waitpid wnohang return value
A much better practice is the use of SIGCHLD signal which is sent to parent process when one of its children dies. Thus, catching it in parent ..., while ( (pid = waitpid(-1, &stat, WNOHANG)) > 0) printf("child %d ... It will return 0 or error out with a -1 (ECHILD) when there are no more ...,A value of -1 or WAIT_ANY requests status information for any child process; a value ... However, if the WNOHANG option was specified, waitpid will return zero ... , If wait() or waitpid() returns because the status of a child process is available, these functions shall return a value equal to the process ID of the ...,跳到 RETURN VALUE - waitpid(): on success, returns the process ID of the child whose state has changed; if WNOHANG was specified and one or more ... , The status is meaningless if the pid returned was 0. Think about it. ... The return value of waitpid is the PID of the child that was waited for.,Evaluates to a non-zero value if status was returned for a child process that ... If WNOHANG was not set, waitpid() returns the process ID of a child when the ... ,, If you pass -1 and WNOHANG , waitpid() will check if any zombie-children exist. If yes, one of them is reaped and its exit status returned. If not ..., You don't need to keep checking on children. It is job of SIGCHLD signal handler. Every time this handler is fired, you check terminated children ...
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 waitpid wnohang return value 相關參考資料
How does (waitpid((pid_t)-1, NULL, WNOHANG) keep track of child ...
A much better practice is the use of SIGCHLD signal which is sent to parent process when one of its children dies. Thus, catching it in parent ... https://stackoverflow.com How to make sure that `waitpid(-1, &stat, WNOHANG)` collect all ...
while ( (pid = waitpid(-1, &stat, WNOHANG)) > 0) printf("child %d ... It will return 0 or error out with a -1 (ECHILD) when there are no more ... https://stackoverflow.com Process Completion (The GNU C Library) - GNU.org
A value of -1 or WAIT_ANY requests status information for any child process; a value ... However, if the WNOHANG option was specified, waitpid will return zero ... https://www.gnu.org Return value of waitpid() in linux - Stack Overflow
If wait() or waitpid() returns because the status of a child process is available, these functions shall return a value equal to the process ID of the ... https://stackoverflow.com waitpid - wait for process to change state - Linux Man Pages (2)
跳到 RETURN VALUE - waitpid(): on success, returns the process ID of the child whose state has changed; if WNOHANG was specified and one or more ... https://www.systutorials.com waitpid returns pid=0 and WIFEXITED=1 how to get pid? - Stack Overflow
The status is meaningless if the pid returned was 0. Think about it. ... The return value of waitpid is the PID of the child that was waited for. https://stackoverflow.com waitpid() -- wait for process termination - MKS Toolkit
Evaluates to a non-zero value if status was returned for a child process that ... If WNOHANG was not set, waitpid() returns the process ID of a child when the ... https://www.mkssoftware.com waitpid(2): wait for process to change state - Linux man page
https://linux.die.net waitpid, wnohang, wuntraced. How do I use these - Stack Overflow
If you pass -1 and WNOHANG , waitpid() will check if any zombie-children exist. If yes, one of them is reaped and its exit status returned. If not ... https://stackoverflow.com When and why should you use WNOHANG with waitpid()? - Stack Overflow
You don't need to keep checking on children. It is job of SIGCHLD signal handler. Every time this handler is fired, you check terminated children ... https://stackoverflow.com |