mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-05-23 22:02:27 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

Support non-blocking i/o across platforms

Browse source 
This change introduces new tests for `O_NONBLOCK` and `SOCK_NONBLOCK` to
confirm that non-blocking i/o is now working on all supported platforms,
including Windows. For example, you can now say on Windows, MacOS, etc.:

    socket(AF_INET, SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP);

To create a non-blocking IPv4 TCP socket. Or you can enable non-blocking
i/o on an existing socket / pipe / etc. file descriptor by calling fcntl

    fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);

This functionality is polyfilled on older Linux kernels too, e.g. RHEL5.
Now that fcntl() support is much better the FIOCLEX / FIONCLEX polyfills
for ioctl() have been removed since they're ugly non-POSIX diameond APIs

This change fixes a weakness in kprintf() that was causing Windows trace
tools to frequently crash.
This commit is contained in:
Justine Tunney 2023-07-23 02:56:47 -07:00
parent 5c9e03e3e0
commit 1d4eb08fa1
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
102 changed files with 678 additions and 331 deletions
Download patch file Download diff file Expand all files Collapse all files

31
libc/sock/socket-sysv.c
View file

@ -22,29 +22,12 @@
#include "libc/sysv/consts/sock.h"
int sys_socket(int family, int type, int protocol) {
static bool once, demodernize;
int sock, olderr;
if (!once && (type & (SOCK_CLOEXEC | SOCK_NONBLOCK))) {
if (IsXnu()) {
demodernize = true;
once = true;
} else {
olderr = errno;
if ((sock = __sys_socket(family, type, protocol)) != -1) {
once = true;
return sock;
} else {
errno = olderr;
demodernize = true;
once = true;
}
}
}
if (!demodernize) {
return __sys_socket(family, type, protocol);
} else {
return __fixupnewsockfd(
__sys_socket(family, type & ~(SOCK_CLOEXEC | SOCK_NONBLOCK), protocol),
type);
int sock, tf, e = errno;
tf = SOCK_CLOEXEC | SOCK_NONBLOCK;
sock = __sys_socket(family, type, protocol);
if (sock == -1 && (type & tf) && (errno == EINVAL || errno == EPROTOTYPE)) {
errno = e; // XNU/RHEL5/etc. don't support flags; see if removing helps
sock = __fixupnewsockfd(__sys_socket(family, type & ~tf, protocol), type);
}
return sock;
}