In linux, you can do:
- open file
- memory map a region of the file (mmap)
- close file
- do stuff with the memory mapped region
- munmap region
In emscripten, it mostly works, but munmap returns -1 if the file is closed.
test.c
#include <sys/mman.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
int main()
{
int fd;
char *addr;
int result;
fd=open("test-unmap.c",O_RDONLY);
addr=mmap(NULL,64,PROT_READ,MAP_SHARED,fd,0);
close(fd);
// this call should succeed, but actually fails
result=munmap(addr,64);
printf("%d\n",result);
}
To reproduce:
emcc test-unmap.c -lnodefs.js -lnoderawfs.js
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In linux, you can do:
In emscripten, it mostly works, but munmap returns -1 if the file is closed.
test.c
#include <sys/mman.h> #include <fcntl.h> #include <unistd.h> #include <stdio.h> int main() { int fd; char *addr; int result; fd=open("test-unmap.c",O_RDONLY); addr=mmap(NULL,64,PROT_READ,MAP_SHARED,fd,0); close(fd); // this call should succeed, but actually fails result=munmap(addr,64); printf("%d\n",result); }To reproduce:
emcc test-unmap.c -lnodefs.js -lnoderawfs.js