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74 lines
1.5 KiB
74 lines
1.5 KiB
/* |
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* Copyright (c) 2005, Junio C Hamano |
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*/ |
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#include "cache.h" |
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static struct lock_file *lock_file_list; |
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static void remove_lock_file(void) |
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{ |
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while (lock_file_list) { |
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if (lock_file_list->filename[0]) |
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unlink(lock_file_list->filename); |
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lock_file_list = lock_file_list->next; |
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} |
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} |
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static void remove_lock_file_on_signal(int signo) |
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{ |
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remove_lock_file(); |
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signal(SIGINT, SIG_DFL); |
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raise(signo); |
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} |
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static int lock_file(struct lock_file *lk, const char *path) |
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{ |
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int fd; |
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sprintf(lk->filename, "%s.lock", path); |
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fd = open(lk->filename, O_RDWR | O_CREAT | O_EXCL, 0666); |
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if (0 <= fd) { |
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if (!lk->on_list) { |
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lk->next = lock_file_list; |
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lock_file_list = lk; |
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lk->on_list = 1; |
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} |
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if (lock_file_list) { |
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signal(SIGINT, remove_lock_file_on_signal); |
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atexit(remove_lock_file); |
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} |
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if (adjust_shared_perm(lk->filename)) |
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return error("cannot fix permission bits on %s", |
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lk->filename); |
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} |
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else |
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lk->filename[0] = 0; |
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return fd; |
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} |
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int hold_lock_file_for_update(struct lock_file *lk, const char *path, int die_on_error) |
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{ |
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int fd = lock_file(lk, path); |
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if (fd < 0 && die_on_error) |
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die("unable to create '%s.lock': %s", path, strerror(errno)); |
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return fd; |
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} |
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int commit_lock_file(struct lock_file *lk) |
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{ |
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char result_file[PATH_MAX]; |
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int i; |
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strcpy(result_file, lk->filename); |
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i = strlen(result_file) - 5; /* .lock */ |
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result_file[i] = 0; |
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i = rename(lk->filename, result_file); |
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lk->filename[0] = 0; |
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return i; |
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} |
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void rollback_lock_file(struct lock_file *lk) |
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{ |
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if (lk->filename[0]) |
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unlink(lk->filename); |
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lk->filename[0] = 0; |
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} |
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