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authorDenis Vlasenko <vda.linux@googlemail.com>2007-04-10 21:40:19 +0000
committerDenis Vlasenko <vda.linux@googlemail.com>2007-04-10 21:40:19 +0000
commitc6758a07c68033627a692cda27aebc8f6a662e7f (patch)
tree51bc0b498a5e16f8041604d913e25708cc76058f /applets
parent335b63d8d1876ce4e172ebcc9d64544785682244 (diff)
make compressed help code NOMMU- and NOFORK-friendly -
no forking anymore, bunzip2 unpack routine now does all it in memory.
Diffstat (limited to 'applets')
-rw-r--r--applets/applets.c67
1 files changed, 28 insertions, 39 deletions
diff --git a/applets/applets.c b/applets/applets.c
index 3441a7886..2f677372d 100644
--- a/applets/applets.c
+++ b/applets/applets.c
@@ -403,44 +403,32 @@ static void check_suid(const struct bb_applet *applet)
static const char *unpack_usage_messages(void)
{
- int input[2], output[2], pid;
- char *buf;
-
- if (pipe(input) < 0 || pipe(output) < 0)
- exit(1);
-
-//TODO: not NOMMU friendly!
- pid = fork();
- switch (pid) {
- case -1: /* error */
- exit(1);
- case 0: /* child */
- close(input[1]);
- close(output[0]);
- uncompressStream(input[0], output[1]);
- exit(0);
- }
- /* parent */
-
- close(input[0]);
- close(output[1]);
- pid = fork();
- switch (pid) {
- case -1: /* error */
- exit(1);
- case 0: /* child */
- full_write(input[1], packed_usage, sizeof(packed_usage));
- exit(0);
- }
- /* parent */
- close(input[1]);
+ char *outbuf = NULL;
+ bunzip_data *bd;
+ int i;
- buf = xmalloc(SIZEOF_usage_messages);
- full_read(output[0], buf, SIZEOF_usage_messages);
- return buf;
+ i = start_bunzip(&bd,
+ /* src_fd: */ -1,
+ /* inbuf: */ packed_usage,
+ /* len: */ sizeof(packed_usage));
+ /* read_bunzip can longjmp to start_bunzip, and ultimately
+ * end up here with i != 0 on read data errors! Not trivial */
+ if (!i) {
+ /* Cannot use xmalloc: will leak bd in NOFORK case! */
+ outbuf = malloc_or_warn(SIZEOF_usage_messages);
+ if (outbuf)
+ read_bunzip(bd, outbuf, SIZEOF_usage_messages);
+ }
+ dealloc_bunzip(bd);
+ return outbuf;
}
+#define dealloc_usage_messages(s) free(s)
+
#else
+
#define unpack_usage_messages() usage_messages
+#define dealloc_usage_messages(s) ((void)(s))
+
#endif /* FEATURE_COMPRESS_USAGE */
@@ -448,22 +436,23 @@ void bb_show_usage(void)
{
if (ENABLE_SHOW_USAGE) {
const char *format_string;
- const char *usage_string = unpack_usage_messages();
+ const char *p;
+ const char *usage_string = p = unpack_usage_messages();
int i;
i = current_applet - applets;
while (i) {
- while (*usage_string++) continue;
+ while (*p++) continue;
i--;
}
format_string = "%s\n\nUsage: %s %s\n\n";
- if (*usage_string == '\b')
+ if (*p == '\b')
format_string = "%s\n\nNo help available.\n\n";
fprintf(stderr, format_string, bb_msg_full_version,
- applet_name, usage_string);
+ applet_name, p);
+ dealloc_usage_messages((char*)usage_string);
}
-
xfunc_die();
}