posix/tst-fexecve.c

   1 /* Copyright (C) 2017-2023 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <unistd.h>
  19 #include <errno.h>
  20 #include <fcntl.h>
  21 #include <sys/wait.h>
  22
  23 #include <support/check.h>
  24
  25 /* Try executing "/bin/sh -c true", using FD opened on /bin/sh.  */
  26 static int
  27 try_fexecve (int fd)
  28 {
  29   pid_t pid = fork ();
  30
  31   if (pid == 0)
  32     {
  33       static const char *const argv[] = {
  34         "/bin/sh", "-c", "true", NULL
  35       };
  36       fexecve (fd, (char *const *) argv, environ);
  37       _exit (errno);
  38     }
  39   if (pid < 0)
  40     FAIL_RET ("fork failed: %m");
  41
  42   pid_t termpid;
  43   int status;
  44   termpid = TEMP_FAILURE_RETRY (waitpid (pid, &status, 0));
  45   if (termpid == -1)
  46     FAIL_RET ("waitpid failed: %m");
  47   if (termpid != pid)
  48     FAIL_RET ("waitpid returned %ld != %ld",
  49               (long int) termpid, (long int) pid);
  50   if (!WIFEXITED (status))
  51     FAIL_RET ("child hasn't exited normally");
  52
  53   /* If fexecve is unimplemented mark this test as UNSUPPORTED.  */
  54   if (WEXITSTATUS (status) == ENOSYS)
  55     FAIL_UNSUPPORTED ("fexecve is unimplemented");
  56
  57   if (WEXITSTATUS (status) != 0)
  58     {
  59       errno = WEXITSTATUS (status);
  60       FAIL_RET ("fexecve failed: %m");
  61     }
  62   return 0;
  63 }
  64
  65 static int
  66 do_test (void)
  67 {
  68   int fd;
  69   int ret;
  70
  71   fd = open ("/bin/sh", O_RDONLY);
  72   if (fd < 0)
  73     FAIL_UNSUPPORTED ("/bin/sh cannot be opened: %m");
  74   ret = try_fexecve (fd);
  75   close (fd);
  76
  77 #ifdef O_PATH
  78   fd = open ("/bin/sh", O_RDONLY | O_PATH);
  79   if (fd < 0)
  80     FAIL_UNSUPPORTED ("/bin/sh cannot be opened (O_PATH): %m");
  81   ret |= try_fexecve (fd);
  82   close (fd);
  83 #endif
  84
  85   return ret;
  86 }
  87
  88 #include <support/test-driver.c>