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Description
The following test code runs perfectly fine when compiled with clang and ran, but when ran with emscripten the ftruncate operation throws a Permission error instead of going through as expected.
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
int main() {
int fd = 0;
char filename[] = "XXXXXX";
// Test
assert((fd = mkstemp(filename)) >= 0);
assert(chmod(filename, 0) >= 0);
assert(ftruncate(fd, 69) >= 0);
// Cleanup
assert(close(fd) >= 0);
assert(remove(filename) >= 0);
printf("ok\n");
return 0;
}
Ran with
clang main.c -o testfs && ./testfsemcc main.c -s ENVIRONMENT=node -s MAIN_MODULE -o out.js && node out.js
Current behavior
Clang build prints ok, emcc build fails (assertion error at ftruncate)
Expected behavior
Both should print "ok"
Environment
OS: Arch Linux clang version 12.0.1 emscripten version 2.0.26 (with clang 13.0.0) node version 16.4.2