[Support] exit with custom return code for SIGPIPE
Summary:
We tell the user to file a bug report on LLVM right now, and
SIGPIPE isn't LLVM's fault so our error message is wrong.
Allows frontends to detect SIGPIPE from writing to closed readers.
This can be seen commonly from piping into head, tee, or split.
Fixes PR25349, rdar://problem/14285346, b/77310947
Reviewers: jfb
Reviewed By: jfb
Subscribers: majnemer, kristina, llvm-commits, thakis, srhines
Differential Revision: https://reviews.llvm.org/D53000
llvm-svn: 344372
diff --git a/llvm/lib/Support/Unix/Signals.inc b/llvm/lib/Support/Unix/Signals.inc
index de26695..ad88d5e 100644
--- a/llvm/lib/Support/Unix/Signals.inc
+++ b/llvm/lib/Support/Unix/Signals.inc
@@ -47,6 +47,7 @@
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <string>
+#include <sysexits.h>
#ifdef HAVE_BACKTRACE
# include BACKTRACE_HEADER // For backtrace().
#endif
@@ -334,6 +335,10 @@
if (auto OldInterruptFunction = InterruptFunction.exchange(nullptr))
return OldInterruptFunction();
+ // Send a special return code that drivers can check for, from sysexits.h.
+ if (Sig == SIGPIPE)
+ exit(EX_IOERR);
+
raise(Sig); // Execute the default handler.
return;
}