168 lines
3.1 KiB
C
168 lines
3.1 KiB
C
/*
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* This file and its contents are supplied under the terms of the
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* Common Development and Distribution License ("CDDL"), version 1.0.
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* You may only use this file in accordance with the terms of version
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* 1.0 of the CDDL.
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*
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* A full copy of the text of the CDDL should have accompanied this
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* source. A copy of the CDDL is also available via the Internet at
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* http://www.illumos.org/license/CDDL.
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*/
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/*
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* Copyright (c) 2012 by Delphix. All rights reserved.
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*/
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/*
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* Make a directory busy. If the argument is an existing file or directory,
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* simply open it directly and pause. If not, verify that the parent directory
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* exists, and create a new file in that directory.
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*/
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <strings.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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static _Noreturn void
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usage(char *progname)
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{
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(void) fprintf(stderr, "Usage: %s <dirname|filename>\n", progname);
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exit(1);
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}
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static _Noreturn void
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fail(char *err)
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{
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perror(err);
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exit(1);
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}
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static void
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daemonize(void)
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{
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pid_t pid;
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if ((pid = fork()) < 0) {
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fail("fork");
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} else if (pid != 0) {
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(void) fprintf(stdout, "%ld\n", (long)pid);
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exit(0);
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}
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(void) setsid();
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(void) close(0);
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(void) close(1);
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(void) close(2);
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}
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static const char *
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get_basename(const char *path)
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{
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const char *bn = strrchr(path, '/');
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return (bn ? bn + 1 : path);
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}
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static ssize_t
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get_dirnamelen(const char *path)
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{
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const char *end = strrchr(path, '/');
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return (end ? end - path : -1);
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}
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int
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main(int argc, char *argv[])
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{
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int c;
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boolean_t isdir = B_FALSE;
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struct stat sbuf;
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char *fpath = NULL;
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char *prog = argv[0];
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while ((c = getopt(argc, argv, "")) != -1) {
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switch (c) {
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default:
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usage(prog);
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}
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}
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argc -= optind;
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argv += optind;
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if (argc != 1)
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usage(prog);
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if (stat(argv[0], &sbuf) != 0) {
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char *arg;
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const char *dname, *fname;
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size_t arglen;
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ssize_t dnamelen;
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/*
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* The argument supplied doesn't exist. Copy the path, and
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* remove the trailing slash if present.
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*/
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if ((arg = strdup(argv[0])) == NULL)
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fail("strdup");
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arglen = strlen(arg);
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if (arg[arglen - 1] == '/')
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arg[arglen - 1] = '\0';
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/* Get the directory and file names. */
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fname = get_basename(arg);
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dname = arg;
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if ((dnamelen = get_dirnamelen(arg)) != -1)
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arg[dnamelen] = '\0';
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else
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dname = ".";
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/* The directory portion of the path must exist */
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if (stat(dname, &sbuf) != 0 || !(sbuf.st_mode & S_IFDIR))
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usage(prog);
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if (asprintf(&fpath, "%s/%s", dname, fname) == -1)
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fail("asprintf");
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free(arg);
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} else
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switch (sbuf.st_mode & S_IFMT) {
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case S_IFDIR:
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isdir = B_TRUE;
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zfs_fallthrough;
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case S_IFLNK:
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case S_IFCHR:
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case S_IFBLK:
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if ((fpath = strdup(argv[0])) == NULL)
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fail("strdup");
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break;
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default:
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usage(prog);
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}
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if (!isdir) {
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int fd;
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if ((fd = open(fpath, O_CREAT | O_RDWR, 0600)) < 0)
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fail("open");
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} else {
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DIR *dp;
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if ((dp = opendir(fpath)) == NULL)
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fail("opendir");
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}
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free(fpath);
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daemonize();
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(void) pause();
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return (0);
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}
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