diff options
| -rw-r--r-- | src/pdumper.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/src/pdumper.c b/src/pdumper.c index 6d303af77d0..fcad5242dfe 100644 --- a/src/pdumper.c +++ b/src/pdumper.c @@ -5065,14 +5065,13 @@ dump_read_all (int fd, void *buf, size_t bytes_to_read) { /* We don't want to use emacs_read, since that relies on the lisp world, and we're not in the lisp world yet. */ - eassert (bytes_to_read <= SSIZE_MAX); size_t bytes_read = 0; while (bytes_read < bytes_to_read) { - /* Some platforms accept only int-sized values to read. */ - unsigned chunk_to_read = INT_MAX; - if (bytes_to_read - bytes_read < chunk_to_read) - chunk_to_read = (unsigned) (bytes_to_read - bytes_read); + /* Some platforms accept only int-sized values to read. + Round this down to a page size (see MAX_RW_COUNT in sysdep.c). */ + int max_rw_count = INT_MAX >> 18 << 18; + size_t chunk_to_read = min (bytes_to_read - bytes_read, max_rw_count); ssize_t chunk = read (fd, (char *) buf + bytes_read, chunk_to_read); if (chunk < 0) return chunk; |