diff options
| -rw-r--r-- | libbb/copyfd.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/libbb/copyfd.c b/libbb/copyfd.c index c5f8b5b87..f42eb7623 100644 --- a/libbb/copyfd.c +++ b/libbb/copyfd.c @@ -22,6 +22,8 @@ static off_t bb_full_fd_action(int src_fd, int dst_fd, off_t size) char *buffer; int buffer_size; + if (size > 0 && size <= 4 * 1024) + goto use_small_buf; /* We want page-aligned buffer, just in case kernel is clever * and can do page-aligned io more efficiently */ buffer = mmap(NULL, CONFIG_FEATURE_COPYBUF_KB * 1024, @@ -30,6 +32,7 @@ static off_t bb_full_fd_action(int src_fd, int dst_fd, off_t size) /* ignored: */ -1, 0); buffer_size = CONFIG_FEATURE_COPYBUF_KB * 1024; if (buffer == MAP_FAILED) { + use_small_buf: buffer = alloca(4 * 1024); buffer_size = 4 * 1024; } |