ash,kill: use common code for kill applet/builtin
# make bloatcheck
function old new delta
evaltreenr 644 654 +10
evaltree 644 654 +10
parse_conf 1440 1444 +4
dpkg_deb_main 426 429 +3
ed_main 3319 3321 +2
passwd_main 2093 2091 -2
kill_main 830 826 -4
singlemount 4609 4601 -8
find_command 962 954 -8
get_lcm 123 105 -18
.rodata 132243 132147 -96
killcmd 449 120 -329
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 5/7 up/down: 29/-465) Total: -436 bytes
# size busybox_old busybox_unstripped
text data bss dec hex filename
723901 2940 27504 754345 b82a9 busybox_old
723457 2940 27504 753901 b80ed busybox_unstripped
diff --git a/procps/kill.c b/procps/kill.c
index 9a6e936..e2b029d 100644
--- a/procps/kill.c
+++ b/procps/kill.c
@@ -10,16 +10,30 @@
#include "busybox.h"
+/* Note: kill_main is directly called from shell in order to implement
+ * kill built-in. Shell substitutes job ids with process groups first.
+ *
+ * This brings some complications:
+ *
+ * + we can't use xfunc here
+ * + we can't use applet_name
+ * + we can't use bb_show_usage
+ * (Above doesn't apply for killall[5] cases)
+ *
+ * kill %n gets translated into kill ' -<process group>' by shell (note space!)
+ * This is needed to avoid collision with kill -9 ... syntax
+ */
+
int kill_main(int argc, char **argv);
int kill_main(int argc, char **argv)
{
char *arg;
pid_t pid;
int signo = SIGTERM, errors = 0, quiet = 0;
- const int killall = (ENABLE_KILLALL && applet_name[4] == 'a'
- && (!ENABLE_KILLALL5 || applet_name[7] != '5'));
- const int killall5 = (ENABLE_KILLALL5 && applet_name[4] == 'a'
- && (!ENABLE_KILLALL || applet_name[7] == '5'));
+ const int killall = (ENABLE_KILLALL && argv[0][4] == 'a'
+ && (!ENABLE_KILLALL5 || argv[0][7] != '5'));
+ const int killall5 = (ENABLE_KILLALL5 && argv[0][4] == 'a'
+ && (!ENABLE_KILLALL || argv[0][7] == '5'));
/* Parse any options */
argc--;
@@ -29,34 +43,38 @@
goto do_it_now;
}
- /* The -l option, which prints out signal names. */
+ /* The -l option, which prints out signal names.
+ * Intended usage in shell:
+ * echo "Died of SIG`kill -l $?`"
+ * We try to mimic what kill from coreutils-6.8 does */
if (arg[1] == 'l' && arg[2] == '\0') {
- const char *name;
if (argc == 1) {
/* Print the whole signal list */
- int col = 0;
for (signo = 1; signo < 32; signo++) {
- name = get_signame(signo);
- if (isdigit(name[0])) continue;
- if (col > 66) {
- puts("");
- col = 0;
- }
- col += printf("%2d) %-6s", signo, name);
+ puts(get_signame(signo));
}
- puts("");
} else { /* -l <sig list> */
while ((arg = *++argv)) {
if (isdigit(arg[0])) {
- signo = xatoi_u(arg);
- name = get_signame(signo);
+ signo = bb_strtou(arg, NULL, 10);
+ if (errno) {
+ bb_error_msg("unknown signal '%s'", arg);
+ return EXIT_FAILURE;
+ }
+ /* Exitcodes >= 0x80 are to be treated
+ * as "killed by signal (exitcode & 0x7f)" */
+ puts(get_signame(signo & 0x7f));
+ /* TODO: 'bad' signal# - coreutils says:
+ * kill: 127: invalid signal
+ * we just print "127" instead */
} else {
signo = get_signum(arg);
- if (signo < 0)
- bb_error_msg_and_die("unknown signal '%s'", arg);
- name = get_signame(signo);
+ if (signo < 0) {
+ bb_error_msg("unknown signal '%s'", arg);
+ return EXIT_FAILURE;
+ }
+ printf("%d\n", signo);
}
- printf("%2d) %s\n", signo, name);
}
}
/* If they specified -l, we are all done */
@@ -74,8 +92,10 @@
/* -SIG */
signo = get_signum(&arg[1]);
- if (signo < 0)
- bb_error_msg_and_die("bad signal name '%s'", &arg[1]);
+ if (signo < 0) { /* || signo > MAX_SIGNUM ? */
+ bb_error_msg("bad signal name '%s'", &arg[1]);
+ return EXIT_FAILURE;
+ }
arg = *++argv;
argc--;
@@ -85,10 +105,6 @@
pid_t sid;
procps_status_t* p = NULL;
-// Cannot happen anyway? We don't TERM ourself, we STOP
-// /* kill(-1, sig) on Linux (at least 2.1.x)
-// * might send signal to the calling process too */
-// signal(SIGTERM, SIG_IGN);
/* Now stop all processes */
kill(-1, SIGSTOP);
/* Find out our own session id */
@@ -104,9 +120,11 @@
return 0;
}
- /* Pid or name required for kill/killall */
- if (argc < 1)
- bb_show_usage();
+ /* Pid or name is required for kill/killall */
+ if (argc < 1) {
+ puts("You need to specify whom to kill");
+ return EXIT_FAILURE;
+ }
if (killall) {
/* Looks like they want to do a killall. Do that */
@@ -140,14 +158,15 @@
/* Looks like they want to do a kill. Do that */
while (arg) {
- /* Huh?
- if (!isdigit(arg[0]) && arg[0] != '-')
- bb_error_msg_and_die("bad pid '%s'", arg);
- */
- pid = xatou(arg);
- /* FIXME: better overflow check? */
- if (kill(pid, signo) != 0) {
- bb_perror_msg("cannot kill pid %u", (unsigned)pid);
+ /* Support shell 'space' trick */
+ if (arg[0] == ' ')
+ arg++;
+ pid = bb_strtoi(arg, NULL, 10);
+ if (errno) {
+ bb_error_msg("bad pid '%s'", arg);
+ errors++;
+ } else if (kill(pid, signo) != 0) {
+ bb_perror_msg("cannot kill pid %d", (int)pid);
errors++;
}
arg = *++argv;