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-rw-r--r--src/xz/signals.c34
1 files changed, 24 insertions, 10 deletions
diff --git a/src/xz/signals.c b/src/xz/signals.c
index ab60488f..b27cd5b5 100644
--- a/src/xz/signals.c
+++ b/src/xz/signals.c
@@ -27,6 +27,11 @@ static volatile sig_atomic_t exit_signal = 0;
/// user_abort to true.
static sigset_t hooked_signals;
+/// True once signals_init() has finished. This is used to skip blocking
+/// signals (with uninitialized hooked_signals) if signals_block() and
+/// signals_unblock() are called before signals_init() has been called.
+static bool signals_are_initialized = false;
+
/// signals_block() and signals_unblock() can be called recursively.
static size_t signals_block_count = 0;
@@ -91,6 +96,8 @@ signals_init(void)
message_signal_handler();
}
+ signals_are_initialized = true;
+
return;
}
@@ -99,10 +106,12 @@ signals_init(void)
extern void
signals_block(void)
{
- if (signals_block_count++ == 0) {
- const int saved_errno = errno;
- mythread_sigmask(SIG_BLOCK, &hooked_signals, NULL);
- errno = saved_errno;
+ if (signals_are_initialized) {
+ if (signals_block_count++ == 0) {
+ const int saved_errno = errno;
+ mythread_sigmask(SIG_BLOCK, &hooked_signals, NULL);
+ errno = saved_errno;
+ }
}
return;
@@ -112,12 +121,14 @@ signals_block(void)
extern void
signals_unblock(void)
{
- assert(signals_block_count > 0);
-
- if (--signals_block_count == 0) {
- const int saved_errno = errno;
- mythread_sigmask(SIG_UNBLOCK, &hooked_signals, NULL);
- errno = saved_errno;
+ if (signals_are_initialized) {
+ assert(signals_block_count > 0);
+
+ if (--signals_block_count == 0) {
+ const int saved_errno = errno;
+ mythread_sigmask(SIG_UNBLOCK, &hooked_signals, NULL);
+ errno = saved_errno;
+ }
}
return;
@@ -157,6 +168,9 @@ signal_handler(DWORD type lzma_attribute((unused)))
// Since we don't get a signal number which we could raise() at
// signals_exit() like on POSIX, just set the exit status to
// indicate an error, so that we cannot return with zero exit status.
+ //
+ // FIXME: Since this function runs in its own thread,
+ // set_exit_status() should have a mutex.
set_exit_status(E_ERROR);
user_abort = true;
return TRUE;