tools/tests/unit_tests/pipe_test_10807398_src/parent.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include <unistd.h>
   4 #include <poll.h>
   5 #include <sys/errno.h>
   6
   7 int main(int argc, char **argv)
   8 {
   9         int fd[2], pid, r;
  10         char *args[3], buf[32];
  11         struct pollfd pfd;
  12         extern char **environ;
  13
  14         if (pipe(fd) < 0) {
  15                 perror("pipe");
  16                 return 1;
  17         }
  18
  19         snprintf(buf, sizeof buf, "%d", fd[0]);
  20
  21         args[0] = "./child";
  22         args[1] = buf;
  23         args[2] = 0;
  24
  25         switch (pid = fork()) {
  26         case -1:
  27                 perror("fork");
  28                 return 1;
  29         case 0:         /* child */
  30                 close(fd[1]);
  31                 execve(args[0], args, environ);
  32                 perror(args[0]);
  33                 _exit(1);
  34         default:        /* parent */
  35                 close(fd[0]);
  36                 pfd.fd = fd[1];
  37                 pfd.events = POLLOUT;
  38                 pfd.revents = 0;
  39                 printf("parent poll(%d)...\n", pfd.fd);
  40                 errno = 0;
  41                 r = poll(&pfd, 1, -1);
  42                 printf("parent poll(%d) returned %d errno %d[%s]\n",
  43                     pfd.fd, r, errno, strerror(errno));
  44                 write(fd[1], "howdy", 5);
  45                 close(fd[1]);
  46                 printf("parent done\n");
  47         }
  48
  49         return 0;
  50 }