diff options
Diffstat (limited to 'lockfile.c')
| -rw-r--r-- | lockfile.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/lockfile.c b/lockfile.c new file mode 100644 index 0000000000..9bc60837aa --- /dev/null +++ b/lockfile.c @@ -0,0 +1,57 @@ +/* + * Copyright (c) 2005, Junio C Hamano + */ +#include <signal.h> +#include "cache.h" + +static struct lock_file *lock_file_list; + +static void remove_lock_file(void) +{ + while (lock_file_list) { + if (lock_file_list->filename[0]) + unlink(lock_file_list->filename); + lock_file_list = lock_file_list->next; + } +} + +static void remove_lock_file_on_signal(int signo) +{ + remove_lock_file(); + signal(SIGINT, SIG_DFL); + raise(signo); +} + +int hold_lock_file_for_update(struct lock_file *lk, const char *path) +{ + int fd; + sprintf(lk->filename, "%s.lock", path); + fd = open(lk->filename, O_RDWR | O_CREAT | O_EXCL, 0666); + if (fd >=0 && !lk->next) { + lk->next = lock_file_list; + lock_file_list = lk; + signal(SIGINT, remove_lock_file_on_signal); + atexit(remove_lock_file); + } + return fd; +} + +int commit_lock_file(struct lock_file *lk) +{ + char result_file[PATH_MAX]; + int i; + strcpy(result_file, lk->filename); + i = strlen(result_file) - 5; /* .lock */ + result_file[i] = 0; + i = rename(lk->filename, result_file); + lk->filename[0] = 0; + return i; +} + +void rollback_lock_file(struct lock_file *lk) +{ + if (lk->filename[0]) + unlink(lk->filename); + lk->filename[0] = 0; +} + |