src/regression/fflush-exit.c

   1 // gcc 4.9.0 introduced an invalid optimization for local weak alias symbols
   2 // which drops stdout fflush from exit in musl
   3 // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61144
   4 #include <errno.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8 #include <unistd.h>
   9 #include <sys/wait.h>
  10 #include "test.h"
  11
  12 #define ASSERT(c) do { \
  13         errno = 0; \
  14         if (!(c)) \
  15                 t_error("%s failed (errno: %s)\n", #c, strerror(errno)); \
  16 } while(0)
  17
  18 int main(void)
  19 {
  20         char tmp[] = "/tmp/testsuite-XXXXXX";
  21         int fd, pid, status;
  22         char c;
  23
  24         ASSERT((fd = mkstemp(tmp)) > 2);
  25         ASSERT((pid = fork()) >= 0);
  26         if (pid == 0) {
  27                 ASSERT(close(1) == 0);
  28                 ASSERT(dup(fd) == 1);
  29                 ASSERT(fwrite("x", 1, 1, stdout) == 1);
  30                 exit(t_status);
  31         }
  32         ASSERT(waitpid(pid, &status, 0) == pid);
  33         ASSERT(WIFEXITED(status) && WEXITSTATUS(status) == 0);
  34         ASSERT(pread(fd, &c, 1, 0) == 1);
  35         ASSERT(c == 'x');
  36         ASSERT(unlink(tmp) == 0);
  37         return t_status;
  38 }