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linux: don't retry syscall after ENOSYS

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Don't try the pipe2() or socketpair(O_CLOEXEC) syscalls when a previous call to
uv__make_pipe() or uv__make_socketpair() call established that the kernel
doesn't support it. Speeds up pipe and socketpair creation on older kernels.
This commit is contained in:
Ben Noordhuis 2012-08-21 00:57:49 +02:00
parent 6545e9bda4
commit d90102e649
1 changed files with 18 additions and 0 deletions
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18
src/unix/process.c
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@ -117,6 +117,11 @@ static void uv__chld(uv_signal_t* handle, int signum) {
int uv__make_socketpair(int fds[2], int flags) {
#if __linux__
static __read_mostly int no_cloexec;
if (no_cloexec)
goto skip;
if (socketpair(AF_UNIX, SOCK_STREAM | UV__SOCK_CLOEXEC | flags, 0, fds) == 0)
return 0;
@ -125,6 +130,10 @@ int uv__make_socketpair(int fds[2], int flags) {
*/
if (errno != EINVAL)
return -1;
no_cloexec = 1;
skip:
#endif
if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds))
@ -144,11 +153,20 @@ int uv__make_socketpair(int fds[2], int flags) {
int uv__make_pipe(int fds[2], int flags) {
#if __linux__
static __read_mostly int no_pipe2;
if (no_pipe2)
goto skip;
if (uv__pipe2(fds, flags | UV__O_CLOEXEC) == 0)
return 0;
if (errno != ENOSYS)
return -1;
no_pipe2 = 1;
skip:
#endif
if (pipe(fds))