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Support non-blocking i/o across platforms

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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
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GPG key ID: BE714B4575D6E328
102 changed files with 678 additions and 331 deletions
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14
libc/sysv/consts/fio.h
View file

@ -3,16 +3,12 @@
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
extern const uint32_t FIOASYNC;
extern const uint32_t FIOCLEX;
extern const uint32_t FIONBIO;
extern const uint32_t FIONCLEX;
extern const uint32_t FIONREAD;
extern const uint32_t FIONREAD; /* one of the few encouraged ioctls */
extern const uint32_t FIONBIO; /* use fcntl(fd, F_SETFL, O_NONBLOCK) */
extern const uint32_t FIOCLEX; /* use fcntl(fd, F_SETFD, FD_CLOEXEC) */
extern const uint32_t FIONCLEX; /* use fcntl(fd, F_SETFD, 0) */
extern const uint32_t FIOASYNC; /* todo: fcntl(fd, F_SETOWN, pid) */
#define FIOASYNC FIOASYNC
#define FIOCLEX FIOCLEX
#define FIONBIO FIONBIO
#define FIONCLEX FIONCLEX
#define FIONREAD FIONREAD
COSMOPOLITAN_C_END_