FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/tests/zfs-tests/cmd/zed_fd_spill-zedlet.c

     /*
      * Permission to use, copy, modify, and/or distribute this software for
      * any purpose with or without fee is hereby granted.
      *
      * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
      * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
      * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
      * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
     * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
     * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     */
    
    #include <sys/types.h>
    #include <sys/wait.h>
    #include <errno.h>
    #include <fcntl.h>
    #include <unistd.h>
    #include <stdlib.h>
    #include <string.h>
    #include <stdio.h>
    
    int main(void) {
            if (fork()) {
                    int err;
                    wait(&err);
                    return (err);
            }
    
            char buf[64];
            sprintf(buf, "/tmp/zts-zed_fd_spill-logdir/%d", getppid());
            int fd = creat(buf, 0644);
            if (fd == -1) {
                    (void) fprintf(stderr, "creat(%s) failed: %s\n", buf,
                        strerror(errno));
                    exit(EXIT_FAILURE);
            }
    
            if (dup2(fd, STDOUT_FILENO) == -1) {
                    close(fd);
                    (void) fprintf(stderr, "dup2(%s, STDOUT_FILENO) failed: %s\n",
                        buf, strerror(errno));
                    exit(EXIT_FAILURE);
            }
    
            snprintf(buf, sizeof (buf), "/proc/%d/fd", getppid());
            execlp("ls", "ls", buf, NULL);
            _exit(127);
    }

Cache object: 786c4e98b0211ad037b76e2d5223b2e4