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sandbox: Add a way to map a file into memory

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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 <sjg@chromium.org>
This commit is contained in:
Simon Glass 2021-08-18 21:40:31 -06:00 committed by Tom Rini
parent b4467fae06
commit b9274095c2
2 changed files with 42 additions and 0 deletions
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29
arch/sandbox/cpu/os.c
View file

@ -182,6 +182,35 @@ err:
return ret;
}
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;
}
/* Restore tty state when we exit */
static struct termios orig_term;
static bool term_setup;

13
include/os.h
View file

@ -406,6 +406,19 @@ int os_write_file(const char *name, const void *buf, int size);
*/
int os_read_file(const char *name, void **bufp, int *sizep);
/**
* os_map_file() - Map a file from the host filesystem into memory
*
* This can be useful when to provide a backing store for an emulated device
*
* @pathname: File pathname to map
* @os_flags: Flags, like OS_O_RDONLY, OS_O_RDWR
* @bufp: Returns buffer containing the file
* @sizep: Returns size of data
* Return: 0 if OK, -ve on error
*/
int os_map_file(const char *pathname, int os_flags, void **bufp, int *sizep);
/*
* os_find_text_base() - Find the text section in this running process
*