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waitpid(): on success, returns the process ID of the child whose state has changed; if WNOHANG was specified and one or more child(ren) specified by pid exist, but have not yet changed state, then 0 is returned.
The waitpid() system call suspends execution of the calling process until a child specified by pid argument has changed state. By default, waitpid () waits only for terminated children, but this behavior is modifiable via the options argument, as described below.
La función waitpid suspende la ejecución del proceso en curso hasta que un hijo especificado por el argumento pid ha terminado, o hasta que se produce una señal cuya acción es finalizar el proceso actual o llamar a la función manejadora de la señal.
8 de sept. de 2010 · It's used generally to wait until a specific process finishes (or otherwise changes state if you're using special flags), based on its process ID (otherwise known as a pid ). It can also be used to wait for any of a group of child processes, either one from a specific process group or any child of the current process.
wait, waitpid - wait for a child process to stop or terminate. Synopsis. #include < sys/wait.h > pid_t wait (int * stat_loc); pid_t waitpid (pid_t pid, int *stat_loc, int options); Description. The wait () and waitpid () functions shall obtain status information pertaining to one of the caller's child processes.
The following Linux-specific options are for use with children created using clone(2); they can also, since Linux 4.7, be used with waitid(): __WCLONE Wait for "clone" children only. If omitted, then wait for "non- clone" children only.
