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waitpid() -- System Call (libc) Wait for a process to terminate #include <sys/types.h> #include <sys/wait.h> pid_t waitpid(pid,status, flags) pid_t pid; int *status, flags; waitpid() waits until a given process terminates. pid identifies the child process whose termination is awaited. The value of pid sets the behavior of waitpid(), as follows: pid>0 Wait for the termination of the child process whose identifier is pid. pid=0 Wait for the termination of any child in the current process group. pid=-1 Wait for the termination of any child process. In this mode, waitpid() behaves the same as the system call wait(). pid<-1 Wait for termination of any child in the group given by -pid. status points to the place where you want waitpid() to write the termination status of pid. flags is the logical OR of the following values: WNOHANG If pid has already terminated, write its termination status into status; but if pid has not yet terminated, do not wait for it to do so. WUNTRACED Report the status of every child process of pid that is stopped, and whose status has not been returned since it stopped. By default, waitpid() returns the process identifier of the chid process whose status is being reported, or -1 if something went wrong. If flags includes WNOHANG, waitpid() returns zero if no status information is available. See Also libc, wait(), wait.h POSIX Standard, §3.2.1