test/misc/popen.c

   1 #include <unistd.h>
   2 #include <stdio.h>
   3 #include <errno.h>
   4 #include <string.h>
   5 #include <signal.h>
   6
   7 #define TEST(r, f, x, m) ( \
   8 ((r) = (f)) == (x) || \
   9 (printf(__FILE__ ":%d: %s failed (" m ")\n", __LINE__, #f, r, x), err++, 0) )
  10
  11 #define TEST_E(f) ( (errno = 0), (f) || \
  12 (printf(__FILE__ ":%d: %s failed (errno = %d)\n", __LINE__, #f, errno), err++, 0) )
  13
  14 #define TEST_S(s, x, m) ( \
  15 !strcmp((s),(x)) || \
  16 (printf(__FILE__ ":%d: [%s] != [%s] (%s)\n", __LINE__, s, x, m), err++, 0) )
  17
  18 static sig_atomic_t got_sig;
  19
  20 static void handler(int sig)
  21 {
  22         got_sig = 1;
  23 }
  24
  25 int main(void)
  26 {
  27         int i;
  28         char foo[6];
  29         char cmd[64];
  30         int err = 0;
  31         FILE *f;
  32
  33         TEST_E(f = popen("echo hello", "r"));
  34         TEST_E(fgets(foo, sizeof foo, f));
  35         TEST_S(foo, "hello", "child process did not say hello");
  36         TEST(i, pclose(f), 0, "exit status %04x != %04x");
  37
  38         signal(SIGUSR1, handler);
  39         snprintf(cmd, sizeof cmd, "read a ; test \"x$a\" = xhello && kill -USR1 %d", getpid());
  40         TEST_E(f = popen(cmd, "w"));
  41         TEST_E(fputs("hello", f) >= 0);
  42         TEST(i, pclose(f), 0, "exit status %04x != %04x");
  43         signal(SIGUSR1, SIG_DFL);
  44         TEST(i, got_sig, 1, "child process did not send signal (%i!=%i)");
  45
  46         return err;
  47 }