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  1. #include <stdlib.h>
  2. #include <unistd.h>
  3.  
  4. void    infinit_pipe(char ***cmd)
  5. {
  6.   int   p[2];
  7.   pid_t pid;
  8.   int   fd_in = 0;
  9.   int   i = 0;
  10.  
  11.  while (cmd[i] != NULL)
  12.     {
  13.       pipe(p);
  14.       if ((pid = fork()) == -1)
  15.         {
  16.           exit(1);
  17.         }
  18.       else if (pid == 0)
  19.         {
  20.           dup2(fd_in, 0);
  21.           if (cmd[i+1] != NULL)
  22.             dup2(p[1], 1);
  23.           close(p[0]);
  24.           execvp((cmd)[i][0], cmd[i]);
  25.           exit(2);
  26.         }
  27.       else
  28.         {
  29.           wait(NULL);
  30.           close(p[1]);
  31.           fd_in = p[0];
  32.           i++;
  33.         }
  34.     }
  35. }
  36.  
  37. int main()
  38. {
  39.   char *ls[] = {"ls", NULL};
  40.   char *grep[] = {"find", ".", "-name", "*", NULL};
  41.   char *wc[] = {"wc", NULL};
  42.   char **cmd[] = {ls, grep, wc, NULL};
  43.  
  44.   infinit_pipe(cmd);
  45. }
  46.  
Success #stdin #stdout 0s 3756KB
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      2       2       9
https://ideone.com/80e3nd
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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