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cae5b340 AX |
1 | /* |
2 | * This file and its contents are supplied under the terms of the | |
3 | * Common Development and Distribution License ("CDDL"), version 1.0. | |
4 | * You may only use this file in accordance with the terms of version | |
5 | * 1.0 of the CDDL. | |
6 | * | |
7 | * A full copy of the text of the CDDL should have accompanied this | |
8 | * source. A copy of the CDDL is also available via the Internet at | |
9 | * http://www.illumos.org/license/CDDL. | |
10 | */ | |
11 | ||
12 | /* | |
13 | * Copyright (c) 2012 by Delphix. All rights reserved. | |
14 | */ | |
15 | ||
16 | /* | |
17 | * Make a directory busy. If the argument is an existing file or directory, | |
18 | * simply open it directly and pause. If not, verify that the parent directory | |
19 | * exists, and create a new file in that directory. | |
20 | */ | |
21 | ||
22 | #include <stdio.h> | |
23 | #include <sys/types.h> | |
24 | #include <sys/stat.h> | |
25 | #include <fcntl.h> | |
26 | #include <dirent.h> | |
27 | #include <strings.h> | |
28 | #include <stdlib.h> | |
29 | #include <unistd.h> | |
30 | #include <errno.h> | |
31 | #include <string.h> | |
32 | ||
33 | typedef enum boolean { B_FALSE, B_TRUE } boolean_t; | |
34 | ||
35 | static void | |
36 | usage(char *progname) | |
37 | { | |
38 | (void) fprintf(stderr, "Usage: %s <dirname|filename>\n", progname); | |
39 | exit(1); | |
40 | } | |
41 | ||
42 | static void | |
43 | fail(char *err, int rval) | |
44 | { | |
45 | perror(err); | |
46 | exit(rval); | |
47 | } | |
48 | ||
49 | static void | |
50 | daemonize(void) | |
51 | { | |
52 | pid_t pid; | |
53 | ||
54 | if ((pid = fork()) < 0) { | |
55 | fail("fork", 1); | |
56 | } else if (pid != 0) { | |
57 | (void) fprintf(stdout, "%ld\n", (long)pid); | |
58 | exit(0); | |
59 | } | |
60 | ||
61 | (void) setsid(); | |
62 | (void) close(0); | |
63 | (void) close(1); | |
64 | (void) close(2); | |
65 | } | |
66 | ||
67 | int | |
68 | main(int argc, char *argv[]) | |
69 | { | |
70 | int ret, c; | |
71 | boolean_t isdir = B_FALSE; | |
72 | boolean_t fflag = B_FALSE; | |
73 | boolean_t rflag = B_FALSE; | |
74 | struct stat sbuf; | |
75 | char *fpath = NULL; | |
76 | char *prog = argv[0]; | |
77 | ||
78 | while ((c = getopt(argc, argv, "fr")) != -1) { | |
79 | switch (c) { | |
80 | /* Open the file or directory read only */ | |
81 | case 'r': | |
82 | rflag = B_TRUE; | |
83 | break; | |
84 | /* Run in the foreground */ | |
85 | case 'f': | |
86 | fflag = B_TRUE; | |
87 | break; | |
88 | default: | |
89 | usage(prog); | |
90 | } | |
91 | } | |
92 | ||
93 | argc -= optind; | |
94 | argv += optind; | |
95 | ||
96 | if (argc != 1) | |
97 | usage(prog); | |
98 | ||
99 | if ((ret = stat(argv[0], &sbuf)) != 0) { | |
100 | char *arg, *dname, *fname; | |
42f7b73b | 101 | int arglen; |
cae5b340 | 102 | char *slash; |
42f7b73b | 103 | int rc; |
cae5b340 AX |
104 | |
105 | /* | |
106 | * The argument supplied doesn't exist. Copy the path, and | |
107 | * remove the trailing slash if presnt. | |
108 | */ | |
109 | if ((arg = strdup(argv[0])) == NULL) | |
110 | fail("strdup", 1); | |
111 | arglen = strlen(arg); | |
112 | if (arg[arglen - 1] == '/') | |
113 | arg[arglen - 1] = '\0'; | |
114 | ||
115 | /* | |
116 | * Get the directory and file names, using the current directory | |
117 | * if the provided path doesn't specify a directory at all. | |
118 | */ | |
119 | if ((slash = strrchr(arg, '/')) == NULL) { | |
120 | dname = strdup("."); | |
121 | fname = strdup(arg); | |
122 | } else { | |
123 | *slash = '\0'; | |
124 | dname = strdup(arg); | |
125 | fname = strdup(slash + 1); | |
126 | } | |
127 | free(arg); | |
128 | if (dname == NULL || fname == NULL) | |
129 | fail("strdup", 1); | |
cae5b340 AX |
130 | |
131 | /* The directory portion of the path must exist */ | |
132 | if ((ret = stat(dname, &sbuf)) != 0 || !(sbuf.st_mode & | |
133 | S_IFDIR)) | |
134 | usage(prog); | |
135 | ||
42f7b73b | 136 | rc = asprintf(&fpath, "%s/%s", dname, fname); |
cae5b340 AX |
137 | free(dname); |
138 | free(fname); | |
42f7b73b AX |
139 | if (rc == -1 || fpath == NULL) |
140 | fail("asprintf", 1); | |
141 | ||
cae5b340 AX |
142 | } else if ((sbuf.st_mode & S_IFMT) == S_IFREG || |
143 | (sbuf.st_mode & S_IFMT) == S_IFLNK || | |
144 | (sbuf.st_mode & S_IFMT) == S_IFCHR || | |
145 | (sbuf.st_mode & S_IFMT) == S_IFBLK) { | |
146 | fpath = strdup(argv[0]); | |
147 | } else if ((sbuf.st_mode & S_IFMT) == S_IFDIR) { | |
148 | fpath = strdup(argv[0]); | |
149 | isdir = B_TRUE; | |
150 | } else { | |
151 | usage(prog); | |
152 | } | |
153 | ||
154 | if (fpath == NULL) | |
155 | fail("strdup", 1); | |
156 | ||
157 | if (isdir == B_FALSE) { | |
158 | int fd, flags; | |
159 | mode_t mode = S_IRUSR | S_IWUSR; | |
160 | ||
161 | flags = rflag == B_FALSE ? O_CREAT | O_RDWR : O_RDONLY; | |
162 | ||
163 | if ((fd = open(fpath, flags, mode)) < 0) | |
164 | fail("open", 1); | |
165 | } else { | |
166 | DIR *dp; | |
167 | ||
168 | if ((dp = opendir(fpath)) == NULL) | |
169 | fail("opendir", 1); | |
170 | } | |
171 | free(fpath); | |
172 | ||
173 | if (fflag == B_FALSE) | |
174 | daemonize(); | |
175 | (void) pause(); | |
176 | ||
177 | /* NOTREACHED */ | |
178 | return (0); | |
179 | } |