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author | Kiyoshi Aman <kiyoshi.aman+adelie@gmail.com> | 2019-02-20 09:51:45 -0600 |
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committer | Kiyoshi Aman <kiyoshi.aman+adelie@gmail.com> | 2019-02-20 09:51:45 -0600 |
commit | ffeabdfb18fd21102159641f5258e8b1c473dec2 (patch) | |
tree | a66ce25858be92d96101046b33d8c859c46594b1 /usr.bin | |
parent | 9bdba795c7d2bb3bc592221776ea63004bf9fe13 (diff) | |
download | userland-ffeabdfb18fd21102159641f5258e8b1c473dec2.tar.gz userland-ffeabdfb18fd21102159641f5258e8b1c473dec2.tar.bz2 userland-ffeabdfb18fd21102159641f5258e8b1c473dec2.tar.xz userland-ffeabdfb18fd21102159641f5258e8b1c473dec2.zip |
usr/bin/link: POSIX link implementation
Diffstat (limited to 'usr.bin')
-rw-r--r-- | usr.bin/link/link.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/usr.bin/link/link.c b/usr.bin/link/link.c new file mode 100644 index 0000000..ed48857 --- /dev/null +++ b/usr.bin/link/link.c @@ -0,0 +1,57 @@ +/* + * link.c -- Create a link between two paths, per link(1p). + * + * Copyright (c) 2019 Kiyoshi Aman, all rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. Neither the name of the copyright holder nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER + * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#define _POSIX_C_SOURCE 200112L + +#include <unistd.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <errno.h> + +int main(int argc, char **argv) { + int error = 0; + if ((argc < 3) || (argc > 3)) { + fprintf(stderr, "Usage: %s file1 file2\n\nCreates a hard link for file1 which points to file2.\n", argv[0]); + exit(EXIT_FAILURE); + } + if ((error = link(argv[1], argv[2])) != 0) { + char msg[128]; + strerror_r(errno, msg, 128); + fprintf(stderr, "Could not create link: %s\n", msg); + } else { + return EXIT_SUCCESS; + } +} |