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libuv: unix: restart syscalls interrupted by our signal handler

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BSD `signal(2)` semantics make some system calls (e.g. for `write`)
restartable when interrupted by a signal handler.  Use `SA_RESTART` to
enable these semantics everywhere that supports them.

This is required by C++ stream libraries that interpret `EINTR` as any
other error, set `badbit`, and stop writing.  I've observed this with
`libstdc++` during a `std::cout.flush()` call interrupted by `SIGCHLD`.
This commit is contained in:
Brad King 2017-12-22 20:24:33 -05:00
parent f7f34a46e6
commit 4ffb0f8b45
1 changed files with 6 additions and 1 deletions
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7
Utilities/cmlibuv/src/unix/signal.c
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@ -28,6 +28,9 @@
#include <string.h>
#include <unistd.h>
#ifndef SA_RESTART
# define SA_RESTART 0
#endif
typedef struct {
uv_signal_t* handle;
@ -216,7 +219,9 @@ static int uv__signal_register_handler(int signum, int oneshot) {
if (sigfillset(&sa.sa_mask))
abort();
sa.sa_handler = uv__signal_handler;
sa.sa_flags = oneshot ? SA_RESETHAND : 0;
sa.sa_flags = SA_RESTART;
if (oneshot)
sa.sa_flags |= SA_RESETHAND;
/* XXX save old action so we can restore it later on? */
if (sigaction(signum, &sa, NULL))