tests/zfs-tests/cmd/zed_fd_spill-zedlet.c

   1 /*
   2  * Permission to use, copy, modify, and/or distribute this software for
   3  * any purpose with or without fee is hereby granted.
   4  *
   5  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   6  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   7  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   8  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   9  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
  10  * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  11  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  12  */
  13
  14 #include <sys/types.h>
  15 #include <sys/wait.h>
  16 #include <errno.h>
  17 #include <fcntl.h>
  18 #include <unistd.h>
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include <stdio.h>
  22
  23 int main(void) {
  24         if (fork()) {
  25                 int err;
  26                 wait(&err);
  27                 return (err);
  28         }
  29
  30         char buf[64];
  31         sprintf(buf, "/tmp/zts-zed_fd_spill-logdir/%d", getppid());
  32         int fd = creat(buf, 0644);
  33         if (fd == -1) {
  34                 (void) fprintf(stderr, "creat(%s) failed: %s\n", buf,
  35                     strerror(errno));
  36                 exit(EXIT_FAILURE);
  37         }
  38
  39         if (dup2(fd, STDOUT_FILENO) == -1) {
  40                 close(fd);
  41                 (void) fprintf(stderr, "dup2(%s, STDOUT_FILENO) failed: %s\n",
  42                     buf, strerror(errno));
  43                 exit(EXIT_FAILURE);
  44         }
  45
  46         snprintf(buf, sizeof (buf), "/proc/%d/fd", getppid());
  47         execlp("ls", "ls", buf, NULL);
  48         _exit(127);
  49 }