diff options
Diffstat (limited to 'gdbsupport/scoped_ignore_signal.h')
| -rw-r--r-- | gdbsupport/scoped_ignore_signal.h | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/gdbsupport/scoped_ignore_signal.h b/gdbsupport/scoped_ignore_signal.h index 55a921c..a14c967 100644 --- a/gdbsupport/scoped_ignore_signal.h +++ b/gdbsupport/scoped_ignore_signal.h @@ -25,9 +25,16 @@ /* RAII class used to ignore a signal in a scope. If sigprocmask is supported, then the signal is only ignored by the calling thread. Otherwise, the signal disposition is set to SIG_IGN, which affects - the whole process. */ - -template <int Sig> + the whole process. If ConsumePending is true, the destructor + consumes a pending Sig. SIGPIPE for example is queued on the + thread even if blocked at the time the pipe is written to. SIGTTOU + OTOH is not raised at all if the thread writing to the terminal has + it blocked. Because SIGTTOU is sent to the whole process instead + of to a specific thread, consuming a pending SIGTTOU in the + destructor could consume a signal raised due to actions done by + some other thread. */ + +template <int Sig, bool ConsumePending> class scoped_ignore_signal { public: @@ -58,7 +65,8 @@ public: /* If we got a pending Sig signal, consume it before unblocking. */ - sigtimedwait (&set, nullptr, &zero_timeout); + if (ConsumePending) + sigtimedwait (&set, nullptr, &zero_timeout); sigprocmask (SIG_UNBLOCK, &set, nullptr); } @@ -89,7 +97,7 @@ struct scoped_ignore_signal_nop }; #ifdef SIGPIPE -using scoped_ignore_sigpipe = scoped_ignore_signal<SIGPIPE>; +using scoped_ignore_sigpipe = scoped_ignore_signal<SIGPIPE, true>; #else using scoped_ignore_sigpipe = scoped_ignore_signal_nop; #endif |