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authorJames Byrne2019-07-02 11:35:03 +0200
committerDenys Vlasenko2019-07-02 11:35:03 +0200
commit6937487be73cd4563b876413277a295a5fe2f32c (patch)
treef16cc9999a7c827891e6ec8d99c699fc791008ee /networking/nc_bloaty.c
parentcaecfdc20d450686cd1f7e9b5f650322f894b3c2 (diff)
downloadbusybox-6937487be73cd4563b876413277a295a5fe2f32c.zip
busybox-6937487be73cd4563b876413277a295a5fe2f32c.tar.gz
libbb: reduce the overhead of single parameter bb_error_msg() calls
Back in 2007, commit 0c97c9d43707 ("'simple' error message functions by Loic Grenie") introduced bb_simple_perror_msg() to allow for a lower overhead call to bb_perror_msg() when only a string was being printed with no parameters. This saves space for some CPU architectures because it avoids the overhead of a call to a variadic function. However there has never been a simple version of bb_error_msg(), and since 2007 many new calls to bb_perror_msg() have been added that only take a single parameter and so could have been using bb_simple_perror_message(). This changeset introduces 'simple' versions of bb_info_msg(), bb_error_msg(), bb_error_msg_and_die(), bb_herror_msg() and bb_herror_msg_and_die(), and replaces all calls that only take a single parameter, or use something like ("%s", arg), with calls to the corresponding 'simple' version. Since it is likely that single parameter calls to the variadic functions may be accidentally reintroduced in the future a new debugging config option WARN_SIMPLE_MSG has been introduced. This uses some macro magic which will cause any such calls to generate a warning, but this is turned off by default to avoid use of the unpleasant macros in normal circumstances. This is a large changeset due to the number of calls that have been replaced. The only files that contain changes other than simple substitution of function calls are libbb.h, libbb/herror_msg.c, libbb/verror_msg.c and libbb/xfuncs_printf.c. In miscutils/devfsd.c, networking/udhcp/common.h and util-linux/mdev.c additonal macros have been added for logging so that single parameter and multiple parameter logging variants exist. The amount of space saved varies considerably by architecture, and was found to be as follows (for 'defconfig' using GCC 7.4): Arm: -92 bytes MIPS: -52 bytes PPC: -1836 bytes x86_64: -938 bytes Note that for the MIPS architecture only an exception had to be made disabling the 'simple' calls for 'udhcp' (in networking/udhcp/common.h) because it made these files larger on MIPS. Signed-off-by: James Byrne <james.byrne@origamienergy.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'networking/nc_bloaty.c')
-rw-r--r--networking/nc_bloaty.c18
1 files changed, 9 insertions, 9 deletions
diff --git a/networking/nc_bloaty.c b/networking/nc_bloaty.c
index 42c84de..034e03d 100644
--- a/networking/nc_bloaty.c
+++ b/networking/nc_bloaty.c
@@ -198,8 +198,8 @@ enum {
#define Debug(...) do { } while (0)
#endif
-#define holler_error(...) do { if (o_verbose) bb_error_msg(__VA_ARGS__); } while (0)
-#define holler_perror(...) do { if (o_verbose) bb_perror_msg(__VA_ARGS__); } while (0)
+#define holler_error(msg) do { if (o_verbose) bb_simple_error_msg(msg); } while (0)
+#define holler_perror(msg) do { if (o_verbose) bb_simple_perror_msg(msg); } while (0)
/* catch: no-brainer interrupt handler */
static void catch(int sig)
@@ -361,10 +361,10 @@ static void dolisten(int is_persistent, char **proggie)
rr = recv_from_to(netfd, NULL, 0, MSG_PEEK, /*was bigbuf_net, BIGSIZ*/
&remend.u.sa, &ouraddr->u.sa, ouraddr->len);
if (rr < 0)
- bb_perror_msg_and_die("recvfrom");
+ bb_simple_perror_msg_and_die("recvfrom");
unarm();
} else
- bb_error_msg_and_die("timeout");
+ bb_simple_error_msg_and_die("timeout");
/* Now we learned *to which IP* peer has connected, and we want to anchor
our socket on it, so that our outbound packets will have correct local IP.
Unfortunately, bind() on already bound socket will fail now (EINVAL):
@@ -382,7 +382,7 @@ create new one, and bind() it. TODO */
remend.len = LSA_SIZEOF_SA;
rr = accept(netfd, &remend.u.sa, &remend.len);
if (rr < 0)
- bb_perror_msg_and_die("accept");
+ bb_simple_perror_msg_and_die("accept");
if (themaddr) {
int sv_port, port, r;
@@ -409,7 +409,7 @@ create new one, and bind() it. TODO */
}
unarm();
} else
- bb_error_msg_and_die("timeout");
+ bb_simple_error_msg_and_die("timeout");
if (is_persistent && proggie) {
/* -l -k -e PROG */
@@ -494,7 +494,7 @@ static int udptest(void)
rr = write(netfd, bigbuf_in, 1);
if (rr != 1)
- bb_perror_msg("udptest first write");
+ bb_simple_perror_msg("udptest first write");
if (o_wait)
sleep(o_wait); // can be interrupted! while (t) nanosleep(&t)?
@@ -644,7 +644,7 @@ static int readwrite(void)
if (rr <= 0) {
if (rr < 0 && o_verbose > 1) {
/* nc 1.10 doesn't do this */
- bb_perror_msg("net read");
+ bb_simple_perror_msg("net read");
}
pfds[1].fd = -1; /* don't poll for netfd anymore */
fds_open--;
@@ -869,7 +869,7 @@ int nc_main(int argc UNUSED_PARAM, char **argv)
/* apparently UDP can listen ON "port 0",
but that's not useful */
if (!o_lport)
- bb_error_msg_and_die("UDP listen needs nonzero -p port");
+ bb_simple_error_msg_and_die("UDP listen needs nonzero -p port");
}
#endif