diff options
Diffstat (limited to 'libbb/copyfd.c')
| -rw-r--r-- | libbb/copyfd.c | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/libbb/copyfd.c b/libbb/copyfd.c index f42eb7623..2538d496d 100644 --- a/libbb/copyfd.c +++ b/libbb/copyfd.c @@ -9,8 +9,10 @@ #include "libbb.h" -/* Used by NOFORK applets (e.g. cat) - must not use xmalloc */ - +/* Used by NOFORK applets (e.g. cat) - must not use xmalloc. + * size < 0 means "ignore write errors", used by tar --to-command + * size = 0 means "copy till EOF" + */ static off_t bb_full_fd_action(int src_fd, int dst_fd, off_t size) { int status = -1; @@ -21,6 +23,12 @@ static off_t bb_full_fd_action(int src_fd, int dst_fd, off_t size) #else char *buffer; int buffer_size; + bool continue_on_write_error = 0; + + if (size < 0) { + size = -size; + continue_on_write_error = 1; + } if (size > 0 && size <= 4 * 1024) goto use_small_buf; @@ -63,8 +71,11 @@ static off_t bb_full_fd_action(int src_fd, int dst_fd, off_t size) if (dst_fd >= 0) { ssize_t wr = full_write(dst_fd, buffer, rd); if (wr < rd) { - bb_perror_msg(bb_msg_write_error); - break; + if (!continue_on_write_error) { + bb_perror_msg(bb_msg_write_error); + break; + } + dst_fd = -1; } } total += rd; @@ -108,7 +119,7 @@ off_t FAST_FUNC bb_copyfd_size(int fd1, int fd2, off_t size) void FAST_FUNC bb_copyfd_exact_size(int fd1, int fd2, off_t size) { off_t sz = bb_copyfd_size(fd1, fd2, size); - if (sz == size) + if (sz == (size >= 0 ? size : -size)) return; if (sz != -1) bb_error_msg_and_die("short read"); |