From: Eric Wong <normalperson@yhbt.net>
To: kgio@librelist.org
Subject: [PATCH 1/2] check syscall returns against < 0 instead of == -1
Date: Fri, 16 Aug 2013 02:09:27 +0000 [thread overview]
Message-ID: <1376618968-13492-2-git-send-email-normalperson@yhbt.net> (raw)
In-Reply-To: 1376618968-13492-1-git-send-email-normalperson@yhbt.net
This may help us avoid errors in case of C library bugs,
and also results in smaller code:
$ ~/linux/scripts/bloat-o-meter before.so after.so
add/remove: 0/0 grow/shrink: 0/9 up/down: 0/-66 (-66)
function old new delta
s_trywrite 160 159 -1
kgio_write 160 159 -1
kgio_trywrite 160 159 -1
my_recv 616 610 -6
my_peek 616 610 -6
stream_connect 456 448 -8
my_socket 222 213 -9
my_writev 1703 1687 -16
write_check 427 409 -18
---
ext/kgio/accept.c | 4 ++--
ext/kgio/connect.c | 8 ++++----
ext/kgio/nonblock.h | 6 +++++-
ext/kgio/read_write.c | 6 +++---
ext/kgio/tryopen.c | 4 ++--
5 files changed, 16 insertions(+), 12 deletions(-)
diff --git a/ext/kgio/accept.c b/ext/kgio/accept.c
index 5f07532..503b5e9 100644
--- a/ext/kgio/accept.c
+++ b/ext/kgio/accept.c
@@ -68,7 +68,7 @@ static VALUE xaccept(void *ptr)
int rv;
rv = accept_fn(a->fd, a->addr, a->addrlen, a->flags);
- if (rv == -1 && errno == ENOSYS && accept_fn != my_accept4) {
+ if (rv < 0 && errno == ENOSYS && accept_fn != my_accept4) {
accept_fn = my_accept4;
rv = accept_fn(a->fd, a->addr, a->addrlen, a->flags);
}
@@ -170,7 +170,7 @@ my_accept(struct accept_args *a, int force_nonblock)
retry:
client_fd = thread_accept(a, force_nonblock);
- if (client_fd == -1) {
+ if (client_fd < 0) {
switch (errno) {
case EAGAIN:
if (force_nonblock)
diff --git a/ext/kgio/connect.c b/ext/kgio/connect.c
index 63c0bbc..2027795 100644
--- a/ext/kgio/connect.c
+++ b/ext/kgio/connect.c
@@ -36,7 +36,7 @@ static int my_socket(int domain)
retry:
fd = socket(domain, MY_SOCK_STREAM, 0);
- if (fd == -1) {
+ if (fd < 0) {
switch (errno) {
case EMFILE:
case ENFILE:
@@ -53,12 +53,12 @@ retry:
goto retry;
}
}
- if (fd == -1)
+ if (fd < 0)
rb_sys_fail("socket");
}
if (MY_SOCK_STREAM == SOCK_STREAM) {
- if (fcntl(fd, F_SETFL, O_RDWR | O_NONBLOCK) == -1)
+ if (fcntl(fd, F_SETFL, O_RDWR | O_NONBLOCK) < 0)
close_fail(fd, "fcntl(F_SETFL, O_RDWR | O_NONBLOCK)");
rb_fd_fix_cloexec(fd);
}
@@ -71,7 +71,7 @@ my_connect(VALUE klass, int io_wait, int domain, void *addr, socklen_t addrlen)
{
int fd = my_socket(domain);
- if (connect(fd, addr, addrlen) == -1) {
+ if (connect(fd, addr, addrlen) < 0) {
if (errno == EINPROGRESS) {
VALUE io = sock_for_fd(klass, fd);
diff --git a/ext/kgio/nonblock.h b/ext/kgio/nonblock.h
index 43de8cd..2d9a13a 100644
--- a/ext/kgio/nonblock.h
+++ b/ext/kgio/nonblock.h
@@ -5,11 +5,15 @@ static void set_nonblocking(int fd)
{
int flags = fcntl(fd, F_GETFL);
+ /*
+ * do not check < 0 here, one day we may have enough FD flags
+ * to require negative bit
+ */
if (flags == -1)
rb_sys_fail("fcntl(F_GETFL)");
if ((flags & O_NONBLOCK) == O_NONBLOCK)
return;
flags = fcntl(fd, F_SETFL, flags | O_NONBLOCK);
- if (flags == -1)
+ if (flags < 0)
rb_sys_fail("fcntl(F_SETFL)");
}
diff --git a/ext/kgio/read_write.c b/ext/kgio/read_write.c
index 4ce3541..f4d658c 100644
--- a/ext/kgio/read_write.c
+++ b/ext/kgio/read_write.c
@@ -109,7 +109,7 @@ static void prepare_read(struct io_args *a, int argc, VALUE *argv, VALUE io)
static int read_check(struct io_args *a, long n, const char *msg, int io_wait)
{
- if (n == -1) {
+ if (n < 0) {
if (errno == EINTR) {
a->fd = my_fileno(a->io);
return -1;
@@ -344,7 +344,7 @@ static int write_check(struct io_args *a, long n, const char *msg, int io_wait)
if (a->len == n) {
done:
a->buf = Qnil;
- } else if (n == -1) {
+ } else if (n < 0) {
if (errno == EINTR) {
a->fd = my_fileno(a->io);
return -1;
@@ -589,7 +589,7 @@ static int writev_check(struct io_args_v *a, long n, const char *msg, int io_wai
if (n >= 0) {
if (n > 0) a->something_written = 1;
return trim_writev_buffer(a, n);
- } else if (n == -1) {
+ } else if (n < 0) {
if (errno == EINTR) {
a->fd = my_fileno(a->io);
return -1;
diff --git a/ext/kgio/tryopen.c b/ext/kgio/tryopen.c
index 0ee6a54..5fa6ada 100644
--- a/ext/kgio/tryopen.c
+++ b/ext/kgio/tryopen.c
@@ -106,7 +106,7 @@ static VALUE s_tryopen(int argc, VALUE *argv, VALUE klass)
retry:
fd = (int)rb_thread_blocking_region(nogvl_open, &o, RUBY_UBF_IO, 0);
- if (fd == -1) {
+ if (fd < 0) {
if (errno == EMFILE || errno == ENFILE || errno == ENOMEM) {
rb_gc();
if (retried)
@@ -114,7 +114,7 @@ retry:
retried = 1;
goto retry;
}
- if (fd == -1) {
+ if (fd < 0) {
int saved_errno = errno;
if (!st_lookup(errno2sym, (st_data_t)errno, &rv)) {
--
1.8.2.rc3.2.geae6cf5
next prev parent reply other threads:[~2013-08-16 2:09 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-16 2:09 [PATCH 0/2] minor tweaks for potentially buggy platforms Eric Wong
2013-08-16 2:09 ` Eric Wong [this message]
2013-08-16 2:09 ` [PATCH 2/2] accept: more informative exception on unknown family Eric Wong
2013-08-16 2:15 ` [PATCH 0/2] minor tweaks for potentially buggy platforms Eric Wong
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