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gh-124621: Emscripten: Fix __syscall_ioctl patch (GH-136993)

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If there is an error, we have to return `-errno` not positive errno.
Included in backport of GH-136931: #136988
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Hood Chatham 2025-07-22 15:05:26 +02:00 • committed by GitHub
parent aafbdb5df5
commit 12d2f373b9
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1 changed files with 6 additions and 2 deletions
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8
Python/emscripten_syscalls.c
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@ -1,6 +1,10 @@
#include "emscripten.h" #include "emscripten.h"
#include "stdio.h" #include "stdio.h"
// All system calls: return nonnegative number on success, return -errno on
// failure. Negative results get stored back into errno here:
// https://github.com/emscripten-core/emscripten/blob/main/system/lib/libc/musl/src/internal/syscall_ret.c#L7
// If we're running in node, report the UID of the user in the native system as // If we're running in node, report the UID of the user in the native system as
// the UID of the user. Since the nodefs will report the uid correctly, if we // the UID of the user. Since the nodefs will report the uid correctly, if we
// don't make getuid report it correctly too we'll see some permission errors. // don't make getuid report it correctly too we'll see some permission errors.
@ -302,7 +306,7 @@ int __syscall_ioctl(int fd, int request, void* varargs) {
int flags = fcntl(fd, F_GETFL, 0); int flags = fcntl(fd, F_GETFL, 0);
int nonblock = **((int**)varargs); int nonblock = **((int**)varargs);
if (flags < 0) { if (flags < 0) {
return errno; return -errno;
} }
if (nonblock) { if (nonblock) {
flags |= O_NONBLOCK; flags |= O_NONBLOCK;
@ -311,7 +315,7 @@ int __syscall_ioctl(int fd, int request, void* varargs) {
} }
int res = fcntl(fd, F_SETFL, flags); int res = fcntl(fd, F_SETFL, flags);
if (res < 0) { if (res < 0) {
return errno; return -errno;
} }
return res; return res;
} }