зеркало из https://github.com/microsoft/git.git
100 строки
2.1 KiB
C
100 строки
2.1 KiB
C
/*
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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 const char *alternate_index_output;
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static void remove_lock_file(void)
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{
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pid_t me = getpid();
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while (lock_file_list) {
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if (lock_file_list->owner == me &&
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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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lk->owner = getpid();
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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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int hold_locked_index(struct lock_file *lk, int die_on_error)
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{
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return hold_lock_file_for_update(lk, get_index_file(), die_on_error);
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}
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void set_alternate_index_output(const char *name)
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{
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alternate_index_output = name;
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}
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int commit_locked_index(struct lock_file *lk)
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{
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if (alternate_index_output) {
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int result = rename(lk->filename, alternate_index_output);
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lk->filename[0] = 0;
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return result;
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}
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else
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return commit_lock_file(lk);
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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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