From b9274095c2cd1ae42f232c823e9e9557696be91a Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Wed, 18 Aug 2021 21:40:31 -0600 Subject: sandbox: Add a way to map a file into memory 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 --- arch/sandbox/cpu/os.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) (limited to 'arch/sandbox') diff --git a/arch/sandbox/cpu/os.c b/arch/sandbox/cpu/os.c index a4262881c54..b72dafca2ba 100644 --- a/arch/sandbox/cpu/os.c +++ b/arch/sandbox/cpu/os.c @@ -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; -- cgit v1.2.3