41 lines
903 B
C
41 lines
903 B
C
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// demonstrate multiple children with wait(), detect which child returns
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/wait.h>
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#include <unistd.h>
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int main(int argc, char* argv){
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char *children[][5] = {
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{"./sleep_print","1","wait for me",NULL},
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{"./complain",NULL},
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{"ls","-l","-d",NULL},
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};
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for(int i=0; i<3; i++){
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pid_t child_pid = fork();
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if(child_pid == 0){
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execvp(children[i][0],children[i]);
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perror("Failed to execvp()");
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}
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else{
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printf("PARENT: Started '%s' in child proc %d\n",
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children[i][0], child_pid);
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}
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}
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// parent waits for each child
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for(int i=0; i<3; i++){
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int status;
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int child_pid = wait(&status);
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if(WIFEXITED(status)){
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int retval = WEXITSTATUS(status);
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printf("PARENT: Finished child proc %d, retval: %d\n",
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child_pid, retval);
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}
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}
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return 0;
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}
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