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tar,rpm2cpio: check that child decompressor did not error out

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function                                             old     new   delta
check_errors_in_children                               -      57     +57
tar_main                                             833     848     +15
get_header_tar                                      1720    1733     +13
rpm2cpio_main                                        147     140      -7
handle_SIGCHLD                                        41       -     -41
------------------------------------------------------------------------------
(add/remove: 1/1 grow/shrink: 2/1 up/down: 85/-48)             Total: 37 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2012-03-06 16:33:42 +01:00
parent 02c3c38420
commit faac1d3e6e
4 changed files with 41 additions and 59 deletions
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26
archival/libarchive/open_transformer.c
View File

@ -27,6 +27,32 @@ int FAST_FUNC check_signature16(transformer_aux_data_t *aux, int src_fd, unsigne
return 0;
}
void check_errors_in_children(int signo)
{
int status;
if (!signo) {
/* block waiting for any child */
if (wait(&status) < 0)
return; /* probably there are no children */
goto check_status;
}
/* Wait for any child without blocking */
for (;;) {
if (wait_any_nohang(&status) < 0)
/* wait failed?! I'm confused... */
return;
check_status:
if (WIFEXITED(status) && WEXITSTATUS(status) == 0)
/* this child exited with 0 */
continue;
/* Cannot happen?
if (!WIFSIGNALED(status) && !WIFEXITED(status)) ???; */
bb_got_signal = 1;
}
}
/* transformer(), more than meets the eye */
#if BB_MMU
void FAST_FUNC open_transformer(int fd,

35
archival/rpm2cpio.c
View File

@ -42,26 +42,6 @@ static unsigned skip_header(void)
return sizeof(header) + len;
}
#if SEAMLESS_COMPRESSION
static void handle_SIGCHLD(int signo UNUSED_PARAM)
{
int status;
/* Wait for any child without blocking */
for (;;) {
if (wait_any_nohang(&status) < 0)
/* wait failed?! I'm confused... */
return;
if (WIFEXITED(status) && WEXITSTATUS(status) == 0)
/* this child exited with 0 */
continue;
/* Cannot happen?
if (!WIFSIGNALED(status) && !WIFEXITED(status)) ???; */
bb_got_signal = 1;
}
}
#endif
/* No getopt required */
int rpm2cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int rpm2cpio_main(int argc UNUSED_PARAM, char **argv)
@ -86,10 +66,9 @@ int rpm2cpio_main(int argc UNUSED_PARAM, char **argv)
/* Skip the main header */
skip_header();
#if SEAMLESS_COMPRESSION
/* We need to know whether child (gzip/bzip/etc) exits abnormally */
signal(SIGCHLD, handle_SIGCHLD);
#endif
//if (SEAMLESS_COMPRESSION)
// /* We need to know whether child (gzip/bzip/etc) exits abnormally */
// signal(SIGCHLD, check_errors_in_children);
/* This works, but doesn't report uncompress errors (they happen in child) */
setup_unzip_on_fd(rpm_fd, /*fail_if_not_detected:*/ 1);
@ -100,9 +79,9 @@ int rpm2cpio_main(int argc UNUSED_PARAM, char **argv)
close(rpm_fd);
}
#if SEAMLESS_COMPRESSION
if (SEAMLESS_COMPRESSION) {
check_errors_in_children(0);
return bb_got_signal;
#else
return EXIT_SUCCESS;
#endif
}
return EXIT_SUCCESS;
}

38
archival/tar.c
View File

@ -690,29 +690,6 @@ static llist_t *append_file_list_to_list(llist_t *list)
# define append_file_list_to_list(x) 0
#endif
#ifdef CHECK_FOR_CHILD_EXITCODE
/* Looks like it isn't needed - tar detects malformed (truncated)
* archive if e.g. bunzip2 fails */
static int child_error;
static void handle_SIGCHLD(int status)
{
/* Actually, 'status' is a signo. We reuse it for other needs */
/* Wait for any child without blocking */
if (wait_any_nohang(&status) < 0)
/* wait failed?! I'm confused... */
return;
if (WIFEXITED(status) && WEXITSTATUS(status) == 0)
/* child exited with 0 */
return;
/* Cannot happen?
if (!WIFSIGNALED(status) && !WIFEXITED(status)) return; */
child_error = 1;
}
#endif
//usage:#define tar_trivial_usage
//usage: "-[" IF_FEATURE_TAR_CREATE("c") "xt"
//usage: IF_FEATURE_SEAMLESS_Z("Z")
@ -1059,10 +1036,9 @@ int tar_main(int argc UNUSED_PARAM, char **argv)
if (base_dir)
xchdir(base_dir);
#ifdef CHECK_FOR_CHILD_EXITCODE
/* We need to know whether child (gzip/bzip/etc) exits abnormally */
signal(SIGCHLD, handle_SIGCHLD);
#endif
//if (SEAMLESS_COMPRESSION || OPT_COMPRESS)
// /* We need to know whether child (gzip/bzip/etc) exits abnormally */
// signal(SIGCHLD, check_errors_in_children);
/* Create an archive */
if (opt & OPT_CREATE) {
@ -1118,9 +1094,9 @@ int tar_main(int argc UNUSED_PARAM, char **argv)
if (ENABLE_FEATURE_CLEAN_UP /* && tar_handle->src_fd != STDIN_FILENO */)
close(tar_handle->src_fd);
#ifdef CHECK_FOR_CHILD_EXITCODE
if (SEAMLESS_COMPRESSION || OPT_COMPRESS) {
check_errors_in_children(0);
return bb_got_signal;
#else
return EXIT_SUCCESS;
#endif
}
return EXIT_SUCCESS;
}

1
include/bb_archive.h
View File

@ -224,6 +224,7 @@ int bbunpack(char **argv,
const char *expected_ext
) FAST_FUNC;
void check_errors_in_children(int signo);
#if BB_MMU
void open_transformer(int fd,
int check_signature,