runsvd: shrink by Vladimir

*: use unified trivial signal handler

function                                             old     new   delta
record_signo                                           -      10     +10
process_stdin                                        433     443     +10
bbunpack                                             383     391      +8
wc_main                                              598     605      +7
conescape                                            293     296      +3
nmeter_main                                          670     672      +2
fallbackSort                                        1717    1719      +2
bb_got_signal                                          -       1      +1
microcom_main                                        713     712      -1
signalled                                              2       -      -2
pack_gzip                                           1661    1659      -2
evalvar                                             1376    1374      -2
compare_keys                                         737     735      -2
parse_command                                       1460    1456      -4
expand                                              1748    1744      -4
s_term                                                37      29      -8
s_hangup                                               8       -      -8
fgotsig                                               10       -     -10
find_pair                                            187     169     -18
signal_handler                                       190     170     -20
runsvdir_main                                       1701    1583    -118
------------------------------------------------------------------------------
(add/remove: 2/3 grow/shrink: 6/10 up/down: 43/-199)         Total: -156 bytes

1 files changed, 6 insertions, 14 deletions

diff --git a/miscutils/microcom.c b/miscutils/microcom.c
index ac3e5514f..a322197b8 100644
--- a/miscutils/microcom.c
+++ b/miscutils/microcom.c
@@ -9,14 +9,6 @@
  */
 #include "libbb.h"
 
-/* All known arches use small ints for signals */
-static volatile smallint signalled;
-
-static void signal_handler(int signo)
-{
-        signalled = signo;
-}
-
 // set raw tty mode
 static void xget1(int fd, struct termios *t, struct termios *oldt)
 {
@@ -91,10 +83,10 @@ int microcom_main(int argc UNUSED_PARAM, char **argv)
                 + (1 << SIGINT)
                 + (1 << SIGTERM)
                 + (1 << SIGPIPE)
-                , signal_handler);
+                , record_signo);
 
         // error exit code if we fail to open the device
-        signalled = 1;
+        bb_got_signal = 1;
 
         // open device
         sfd = open_or_warn(argv[0], O_RDWR | O_NOCTTY | O_NONBLOCK);
@@ -123,9 +115,9 @@ int microcom_main(int argc UNUSED_PARAM, char **argv)
         pfd[1].fd = STDIN_FILENO;
         pfd[1].events = POLLIN;
 
-        signalled = 0;
+        bb_got_signal = 0;
         nfd = 2;
-        while (!signalled && safe_poll(pfd, nfd, timeout) > 0) {
+        while (!bb_got_signal && safe_poll(pfd, nfd, timeout) > 0) {
                 if (nfd > 1 && pfd[1].revents) {
                         char c;
                         // read from stdin -> write to device
@@ -159,7 +151,7 @@ skip_write: ;
                                 full_write(STDOUT_FILENO, iobuf, len);
                         else {
                                 // EOF/error -> bail out
-                                signalled = SIGHUP;
+                                bb_got_signal = SIGHUP;
                                 break;
                         }
                 }
@@ -175,5 +167,5 @@ done:
         if (device_lock_file)
                 unlink(device_lock_file);
 
-        return signalled;
+        return bb_got_signal;
 }