git.scottworley.com Git - tl-append/blob - tl-append-test.c

   1 #define _POSIX_C_SOURCE 2
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5
   6 static void die(const char *message) {
   7   fputs(message, stderr);
   8   fputc('\n', stderr);
   9   exit(1);
  10 }
  11
  12 static void die_err(const char *message) {
  13   perror(message);
  14   exit(1);
  15 }
  16
  17 static void write_and_read_line() {
  18   char buf[10];
  19
  20   FILE *p = popen("./tl-append", "w");
  21   if (p == NULL)
  22     die_err("Couldn't run tl-append");
  23   if (fputs("foo\n", p) == EOF)
  24     die("Couldn't write to pipe");
  25   int status = pclose(p);
  26   if (status < 0)
  27     die_err("Error closing pipe");
  28   if (status != 0)
  29     die("tl-append exited abnormally");
  30
  31   FILE *f = fopen("tl.log", "r");
  32   if (f == NULL)
  33     die_err("Error opening log file");
  34   if (fgets(buf, sizeof(buf), f) == NULL)
  35     die("Error reading log file");
  36   if (strncmp("foo\n", buf, sizeof(buf)) != 0)
  37     die("Wrong contents in log file");
  38   if (fclose(f) != 0)
  39     die_err("Error closing log file");
  40 }
  41
  42 int main() { write_and_read_line(); }