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Asked: 2026-05-11T12:26:30+00:00

One such program that uses a wait function like this is this one: #include<stdio.h>

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One such program that uses a wait function like this is this one:

#include<stdio.h>  #include<stdlib.h>  int main()  {      int pid,fd[2]; int n; char line[20];             if(pipe(fd)<0) {          printf('Error creating pipe');      } else {          pid=fork();          if(pid<0) {              printf('Error while forking');          } else {              if(pid>0) {                  close(fd[0]);                  write(fd[1],'Hello\n',6);                  while(wait((int *)0)!=pid);             } else {                  close(fd[1]);                  n=read(fd[0],line,20);                  if(n<0)                  printf('Error reading a file');                  write(1,line,n);              }          }      }      return 0;  }
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1 Answer

  1. stager’s answer is correct. Though it should be noted that the cast is entirely unnecessary since according to the standard, 0 used in a pointer context is the NULL pointer.

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