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[Fuzzer] Make InterruptHandler non-blocking for Fuchsia 

The initial naive approach to simulate SIGINT on Fuchsia was to getchar
and look for ETX. This caused the InterruptHandler thread to lock stdin,
preventing musl's exit() from being able to close the stdio descriptors
and complete. This change uses select() instead.

Patch By: aarongreen

Differential Revision: https://reviews.llvm.org/D45636

llvm-svn: 330328
This commit is contained in:
Petr Hosek 2018-04-19 14:01:46 +00:00
parent f8a92c1fff
commit 7a31c7ad23
1 changed files with 6 additions and 1 deletions
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7
compiler-rt/lib/fuzzer/FuzzerUtilFuchsia.cpp
View File

@ -45,8 +45,13 @@ void AlarmHandler(int Seconds) {
}
void InterruptHandler() {
fd_set readfds;
// Ctrl-C sends ETX in Zircon.
while (getchar() != 0x03);
do {
FD_ZERO(&readfds);
FD_SET(STDIN_FILENO, &readfds);
select(STDIN_FILENO + 1, &readfds, nullptr, nullptr, nullptr);
} while(!FD_ISSET(STDIN_FILENO, &readfds) || getchar() != 0x03);
Fuzzer::StaticInterruptCallback();
}