diff --git a/Python/emscripten_syscalls.c b/Python/emscripten_syscalls.c
index 404d98d492a655..98ee44276e53e0 100644
--- a/Python/emscripten_syscalls.c
+++ b/Python/emscripten_syscalls.c
@@ -1,6 +1,10 @@
#include "emscripten.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
// 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.
@@ -302,7 +306,7 @@ int __syscall_ioctl(int fd, int request, void* varargs) {
int flags = fcntl(fd, F_GETFL, 0);
int nonblock = **((int**)varargs);
if (flags < 0) {
- return errno;
+ return -errno;
}
if (nonblock) {
flags |= O_NONBLOCK;
@@ -311,7 +315,7 @@ int __syscall_ioctl(int fd, int request, void* varargs) {
}
int res = fcntl(fd, F_SETFL, flags);
if (res < 0) {
- return errno;
+ return -errno;
}
return res;
}
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