* `fdopen_tempfile()` has been called on the object
* - `owner` holds the PID of the process that created the file
*
- * - Active, file closed (after successful `close_tempfile()`). Same
+ * - Active, file closed (after `close_tempfile_gently()`). Same
* as the previous state, except that the temporary file is closed,
* `fd` is -1, and `fp` is `NULL`.
*
- * - Inactive (after `delete_tempfile()`, `rename_tempfile()`, a
- * failed attempt to create a temporary file, or a failed
- * `close_tempfile()`). In this state:
+ * - Inactive (after `delete_tempfile()`, `rename_tempfile()`, or a
+ * failed attempt to create a temporary file). In this state:
*
* - `active` is unset
* - `filename` is empty (usually, though there are transitory
* states in which this condition doesn't hold). Client code should
* *not* rely on the filename being empty in this state.
* - `fd` is -1 and `fp` is `NULL`
- * - the object is left registered in the `tempfile_list`, and
- * `on_list` is set.
+ * - the object is removed from `tempfile_list` (but could be used again)
*
* A temporary file is owned by the process that created it. The
* `tempfile` has an `owner` field that records the owner's PID. This
#include "tempfile.h"
#include "sigchain.h"
-static struct tempfile *volatile tempfile_list;
+static VOLATILE_LIST_HEAD(tempfile_list);
-static void remove_tempfiles(int skip_fclose)
+static void remove_tempfiles(int in_signal_handler)
{
pid_t me = getpid();
+ volatile struct volatile_list_head *pos;
- while (tempfile_list) {
- if (tempfile_list->owner == me) {
- /* fclose() is not safe to call in a signal handler */
- if (skip_fclose)
- tempfile_list->fp = NULL;
- delete_tempfile(tempfile_list);
- }
- tempfile_list = tempfile_list->next;
+ list_for_each(pos, &tempfile_list) {
+ struct tempfile *p = list_entry(pos, struct tempfile, list);
+
+ if (!is_tempfile_active(p) || p->owner != me)
+ continue;
+
+ if (p->fd >= 0)
+ close(p->fd);
+
+ if (in_signal_handler)
+ unlink(p->filename.buf);
+ else
+ unlink_or_warn(p->filename.buf);
+
+ p->active = 0;
}
}
raise(signo);
}
-/*
- * Initialize *tempfile if necessary and add it to tempfile_list.
- */
-static void prepare_tempfile_object(struct tempfile *tempfile)
+static struct tempfile *new_tempfile(void)
{
- if (!tempfile_list) {
- /* One-time initialization */
+ struct tempfile *tempfile = xmalloc(sizeof(*tempfile));
+ tempfile->fd = -1;
+ tempfile->fp = NULL;
+ tempfile->active = 0;
+ tempfile->owner = 0;
+ INIT_LIST_HEAD(&tempfile->list);
+ strbuf_init(&tempfile->filename, 0);
+ return tempfile;
+}
+
+static void activate_tempfile(struct tempfile *tempfile)
+{
+ static int initialized;
+
+ if (is_tempfile_active(tempfile))
+ BUG("activate_tempfile called for active object");
+
+ if (!initialized) {
sigchain_push_common(remove_tempfiles_on_signal);
atexit(remove_tempfiles_on_exit);
+ initialized = 1;
}
- if (tempfile->active)
- die("BUG: prepare_tempfile_object called for active object");
- if (!tempfile->on_list) {
- /* Initialize *tempfile and add it to tempfile_list: */
- tempfile->fd = -1;
- tempfile->fp = NULL;
- tempfile->active = 0;
- tempfile->owner = 0;
- strbuf_init(&tempfile->filename, 0);
- tempfile->next = tempfile_list;
- tempfile_list = tempfile;
- tempfile->on_list = 1;
- } else if (tempfile->filename.len) {
- /* This shouldn't happen, but better safe than sorry. */
- die("BUG: prepare_tempfile_object called for improperly-reset object");
- }
+ volatile_list_add(&tempfile->list, &tempfile_list);
+ tempfile->owner = getpid();
+ tempfile->active = 1;
+}
+
+static void deactivate_tempfile(struct tempfile *tempfile)
+{
+ tempfile->active = 0;
+ strbuf_release(&tempfile->filename);
+ volatile_list_del(&tempfile->list);
+ free(tempfile);
}
/* Make sure errno contains a meaningful value on error */
-int create_tempfile(struct tempfile *tempfile, const char *path)
+struct tempfile *create_tempfile(const char *path)
{
- prepare_tempfile_object(tempfile);
+ struct tempfile *tempfile = new_tempfile();
strbuf_add_absolute_path(&tempfile->filename, path);
tempfile->fd = open(tempfile->filename.buf,
tempfile->fd = open(tempfile->filename.buf,
O_RDWR | O_CREAT | O_EXCL, 0666);
if (tempfile->fd < 0) {
- strbuf_reset(&tempfile->filename);
- return -1;
+ deactivate_tempfile(tempfile);
+ return NULL;
}
- tempfile->owner = getpid();
- tempfile->active = 1;
+ activate_tempfile(tempfile);
if (adjust_shared_perm(tempfile->filename.buf)) {
int save_errno = errno;
error("cannot fix permission bits on %s", tempfile->filename.buf);
- delete_tempfile(tempfile);
+ delete_tempfile(&tempfile);
errno = save_errno;
- return -1;
+ return NULL;
}
- return tempfile->fd;
+
+ return tempfile;
}
-void register_tempfile(struct tempfile *tempfile, const char *path)
+struct tempfile *register_tempfile(const char *path)
{
- prepare_tempfile_object(tempfile);
+ struct tempfile *tempfile = new_tempfile();
strbuf_add_absolute_path(&tempfile->filename, path);
- tempfile->owner = getpid();
- tempfile->active = 1;
+ activate_tempfile(tempfile);
+ return tempfile;
}
-int mks_tempfile_sm(struct tempfile *tempfile,
- const char *template, int suffixlen, int mode)
+struct tempfile *mks_tempfile_sm(const char *template, int suffixlen, int mode)
{
- prepare_tempfile_object(tempfile);
+ struct tempfile *tempfile = new_tempfile();
strbuf_add_absolute_path(&tempfile->filename, template);
tempfile->fd = git_mkstemps_mode(tempfile->filename.buf, suffixlen, mode);
if (tempfile->fd < 0) {
- strbuf_reset(&tempfile->filename);
- return -1;
+ deactivate_tempfile(tempfile);
+ return NULL;
}
- tempfile->owner = getpid();
- tempfile->active = 1;
- return tempfile->fd;
+ activate_tempfile(tempfile);
+ return tempfile;
}
-int mks_tempfile_tsm(struct tempfile *tempfile,
- const char *template, int suffixlen, int mode)
+struct tempfile *mks_tempfile_tsm(const char *template, int suffixlen, int mode)
{
+ struct tempfile *tempfile = new_tempfile();
const char *tmpdir;
- prepare_tempfile_object(tempfile);
-
tmpdir = getenv("TMPDIR");
if (!tmpdir)
tmpdir = "/tmp";
strbuf_addf(&tempfile->filename, "%s/%s", tmpdir, template);
tempfile->fd = git_mkstemps_mode(tempfile->filename.buf, suffixlen, mode);
if (tempfile->fd < 0) {
- strbuf_reset(&tempfile->filename);
- return -1;
+ deactivate_tempfile(tempfile);
+ return NULL;
}
- tempfile->owner = getpid();
- tempfile->active = 1;
- return tempfile->fd;
+ activate_tempfile(tempfile);
+ return tempfile;
}
-int xmks_tempfile_m(struct tempfile *tempfile, const char *template, int mode)
+struct tempfile *xmks_tempfile_m(const char *template, int mode)
{
- int fd;
+ struct tempfile *tempfile;
struct strbuf full_template = STRBUF_INIT;
strbuf_add_absolute_path(&full_template, template);
- fd = mks_tempfile_m(tempfile, full_template.buf, mode);
- if (fd < 0)
+ tempfile = mks_tempfile_m(full_template.buf, mode);
+ if (!tempfile)
die_errno("Unable to create temporary file '%s'",
full_template.buf);
strbuf_release(&full_template);
- return fd;
+ return tempfile;
}
FILE *fdopen_tempfile(struct tempfile *tempfile, const char *mode)
{
- if (!tempfile->active)
- die("BUG: fdopen_tempfile() called for inactive object");
+ if (!is_tempfile_active(tempfile))
+ BUG("fdopen_tempfile() called for inactive object");
if (tempfile->fp)
- die("BUG: fdopen_tempfile() called for open object");
+ BUG("fdopen_tempfile() called for open object");
tempfile->fp = fdopen(tempfile->fd, mode);
return tempfile->fp;
const char *get_tempfile_path(struct tempfile *tempfile)
{
- if (!tempfile->active)
- die("BUG: get_tempfile_path() called for inactive object");
+ if (!is_tempfile_active(tempfile))
+ BUG("get_tempfile_path() called for inactive object");
return tempfile->filename.buf;
}
int get_tempfile_fd(struct tempfile *tempfile)
{
- if (!tempfile->active)
- die("BUG: get_tempfile_fd() called for inactive object");
+ if (!is_tempfile_active(tempfile))
+ BUG("get_tempfile_fd() called for inactive object");
return tempfile->fd;
}
FILE *get_tempfile_fp(struct tempfile *tempfile)
{
- if (!tempfile->active)
- die("BUG: get_tempfile_fp() called for inactive object");
+ if (!is_tempfile_active(tempfile))
+ BUG("get_tempfile_fp() called for inactive object");
return tempfile->fp;
}
-int close_tempfile(struct tempfile *tempfile)
+int close_tempfile_gently(struct tempfile *tempfile)
{
- int fd = tempfile->fd;
- FILE *fp = tempfile->fp;
+ int fd;
+ FILE *fp;
int err;
- if (fd < 0)
+ if (!is_tempfile_active(tempfile) || tempfile->fd < 0)
return 0;
+ fd = tempfile->fd;
+ fp = tempfile->fp;
tempfile->fd = -1;
if (fp) {
tempfile->fp = NULL;
err = close(fd);
}
- if (err) {
- int save_errno = errno;
- delete_tempfile(tempfile);
- errno = save_errno;
- return -1;
- }
-
- return 0;
+ return err ? -1 : 0;
}
int reopen_tempfile(struct tempfile *tempfile)
{
+ if (!is_tempfile_active(tempfile))
+ BUG("reopen_tempfile called for an inactive object");
if (0 <= tempfile->fd)
- die("BUG: reopen_tempfile called for an open object");
- if (!tempfile->active)
- die("BUG: reopen_tempfile called for an inactive object");
+ BUG("reopen_tempfile called for an open object");
tempfile->fd = open(tempfile->filename.buf, O_WRONLY);
return tempfile->fd;
}
-int rename_tempfile(struct tempfile *tempfile, const char *path)
+int rename_tempfile(struct tempfile **tempfile_p, const char *path)
{
- if (!tempfile->active)
- die("BUG: rename_tempfile called for inactive object");
+ struct tempfile *tempfile = *tempfile_p;
+
+ if (!is_tempfile_active(tempfile))
+ BUG("rename_tempfile called for inactive object");
- if (close_tempfile(tempfile))
+ if (close_tempfile_gently(tempfile)) {
+ delete_tempfile(tempfile_p);
return -1;
+ }
if (rename(tempfile->filename.buf, path)) {
int save_errno = errno;
- delete_tempfile(tempfile);
+ delete_tempfile(tempfile_p);
errno = save_errno;
return -1;
}
- tempfile->active = 0;
- strbuf_reset(&tempfile->filename);
+ deactivate_tempfile(tempfile);
+ *tempfile_p = NULL;
return 0;
}
-void delete_tempfile(struct tempfile *tempfile)
+void delete_tempfile(struct tempfile **tempfile_p)
{
- if (!tempfile->active)
+ struct tempfile *tempfile = *tempfile_p;
+
+ if (!is_tempfile_active(tempfile))
return;
- if (!close_tempfile(tempfile)) {
- unlink_or_warn(tempfile->filename.buf);
- tempfile->active = 0;
- strbuf_reset(&tempfile->filename);
- }
+ close_tempfile_gently(tempfile);
+ unlink_or_warn(tempfile->filename.buf);
+ deactivate_tempfile(tempfile);
+ *tempfile_p = NULL;
}
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