git-am: give better diagnostics when the patch does not apply during --3way
[git/git.git] / lockfile.c
CommitLineData
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1/*
2 * Copyright (c) 2005, Junio C Hamano
3 */
4#include <signal.h>
5#include "cache.h"
6
7static struct lock_file *lock_file_list;
8
9static void remove_lock_file(void)
10{
11 while (lock_file_list) {
12 if (lock_file_list->filename[0])
13 unlink(lock_file_list->filename);
14 lock_file_list = lock_file_list->next;
15 }
16}
17
18static void remove_lock_file_on_signal(int signo)
19{
20 remove_lock_file();
21 signal(SIGINT, SIG_DFL);
22 raise(signo);
23}
24
25int hold_lock_file_for_update(struct lock_file *lk, const char *path)
26{
27 int fd;
28 sprintf(lk->filename, "%s.lock", path);
29 fd = open(lk->filename, O_RDWR | O_CREAT | O_EXCL, 0666);
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30 if (0 <= fd) {
31 if (!lk->next) {
32 lk->next = lock_file_list;
33 lock_file_list = lk;
34 signal(SIGINT, remove_lock_file_on_signal);
35 atexit(remove_lock_file);
36 }
37 if (adjust_shared_perm(lk->filename))
38 return error("cannot fix permission bits on %s",
39 lk->filename);
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40 }
41 return fd;
42}
43
44int commit_lock_file(struct lock_file *lk)
45{
46 char result_file[PATH_MAX];
47 int i;
48 strcpy(result_file, lk->filename);
49 i = strlen(result_file) - 5; /* .lock */
50 result_file[i] = 0;
51 i = rename(lk->filename, result_file);
52 lk->filename[0] = 0;
53 return i;
54}
55
56void rollback_lock_file(struct lock_file *lk)
57{
58 if (lk->filename[0])
59 unlink(lk->filename);
60 lk->filename[0] = 0;
61}
62