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io: fix mmap writing to actually work 

apparently it needs to have both PROT_READ and PROT_WRITE. and
it needs to be MAP_SHARED for the writing to be effective. oh,
and the data needs to be preallocated with ftruncate; otherwise,
one gets SIGBUS.
cute-signatures
Timo Teras 2009-07-30 09:07:35 +03:00
parent 49420239c2
commit 8e4075e6b1
2 changed files with 7 additions and 5 deletions
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2
src/archive.c
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@ -331,7 +331,7 @@ int apk_archive_entry_extract(const struct apk_file_info *ae,
break;
case S_IFREG:
if (ae->link_target == NULL) {
fd = open(fn, O_WRONLY | O_CREAT, ae->mode & 07777);
fd = open(fn, O_RDWR | O_CREAT, ae->mode & 07777);
if (fd < 0) {
r = -1;
break;

10
src/io.c
View File

@ -113,13 +113,15 @@ size_t apk_istream_splice(void *stream, int fd, size_t size,
apk_progress_cb cb, void *cb_ctx)
{
struct apk_istream *is = (struct apk_istream *) stream;
unsigned char *buf;
unsigned char *buf = MAP_FAILED;
size_t bufsz, done = 0, r, togo, mmapped = 0;
bufsz = size;
if (size > 256 * 1024) {
buf = mmap(NULL, size, PROT_WRITE, 0, fd, 0);
if (buf != NULL) {
if (size > 128 * 1024) {
if (ftruncate(fd, size) == 0)
buf = mmap(NULL, size, PROT_READ | PROT_WRITE,
MAP_SHARED, fd, 0);
if (buf != MAP_FAILED) {
mmapped = 1;
if (bufsz > 2*1024*1024)
bufsz = 2*1024*1024;