On Wed, 18 Aug 2021 21:40:31 -0600
Simon Glass <s...@chromium.org> wrote:
> It is useful to map a file into memory so that it can be accessed using
> simple pointers. Add a function to support this.
>
> Signed-off-by: Simon Glass <s...@chromium.org>
> +int os_map_file(const char *pathname, int os_flags, void **bufp, int *sizep)
> +{
> + void *ptr;
> + int size;
> + int ifd;
> +
> + ifd = os_open(pathname, os_flags);
> + if (ifd < 0) {
> + printf("Cannot open file '%s'\n", pathname);
> + return -EIO;
> + }
> + size = os_filesize(ifd);
> + if (size < 0) {
> + printf("Cannot get file size of '%s'\n", pathname);
> + return -EIO;
> + }
> +
> + ptr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, ifd, 0);
> + if (ptr == MAP_FAILED) {
> + printf("Can't map file '%s': %s\n", pathname, strerror(errno));
> + return -EPERM;
> + }
> +
> + *bufp = ptr;
> + *sizep = size;
> +
> + return 0;
> +}
You need to close the file descriptor after mmapping.
Marek
