From 56373504548ecfede18eac830a54fbffac489bd3 Mon Sep 17 00:00:00 2001
From: Brett Gordon <beretta42@gmail.com>
Date: Wed, 16 Mar 2016 02:15:59 -0400
Subject: [PATCH] kill: more text signals, print list.

---
 Applications/util/kill.c | 119 +++++++++++++++++++++++++++++++++------
 1 file changed, 103 insertions(+), 16 deletions(-)

diff --git a/Applications/util/kill.c b/Applications/util/kill.c
index e7d94608..e9bc276b 100644
--- a/Applications/util/kill.c
+++ b/Applications/util/kill.c
@@ -10,6 +10,99 @@
 #include <ctype.h>
 #include <string.h>
 
+struct sigentry 
+{
+	char *suffix;        /* suffix of textual signal name */
+	int  no;             /* number of signal */
+};
+
+struct sigentry sigtab[]={
+	{ "HUP",   1 },
+	{ "INT",   2 },
+	{ "QUIT",  3 },
+	{ "ILL",   4 },
+        { "TRAP",  5 },
+	{ "ABRT",  6 },
+	{ "IOT",   6 },
+	{ "BUS",   7 },
+	{ "FPE",   8 },
+	{ "KILL",  9 },
+	{ "USR1",  10},
+	{ "SEGV",  11},
+	{ "USR2",  12},
+	{ "PIPE",  13},
+	{ "ALRM",  14},
+	{ "TERM",  15},
+	{ "STKFLT",16},
+	{ "CHLD",  17},
+	{ "CONT",  18},
+	{ "STOP",  19},
+	{ "TSTP",  20},
+	{ "TTIN",  21},
+	{ "TTOU",  22},
+	{ "URG"	,  23},
+	{ "XCPU",  24},
+	{ "XFSZ",  25},
+	{ "VTALRM",26},
+	{ "PROF",  27},
+	{ "WINCH", 28},
+	{ "IO",    29},
+	{ "POLL",  29},
+	{ "PWR",   30},
+	{ "SYS",   31},
+	{ "UNUSED",31},
+	{ NULL, 0 }
+};
+
+int getsig( char *n )
+{
+	struct sigentry *s=sigtab;
+	while( s->suffix ){
+		if( !strcmp(n,s->suffix) )
+			return s->no;
+		s=s+1;
+	}
+	return -1;
+}	
+
+void diesig( void )
+{
+	write(2, "kill: unknown signal\n", 21);
+	exit(1);
+}
+
+char *inttoa( int n )
+{
+	static c[10];
+	char *p=&c[9];
+	*--p=0;
+	while( n ){
+		*--p = (n % 10) + '0';
+		n /= 10;
+	}
+	return p;
+}
+
+void printsigs( void )
+{
+	struct sigentry *s=sigtab;
+	int col=0;
+	while( s->suffix ){
+		int l=strlen(s->suffix);
+		char *np=inttoa( s->no );
+		write(2, "SIG", 3 );
+		write(2, s->suffix, l );
+		write(2, "       ", 7-l );
+		write(2, np, strlen(np) );
+		if( col++ & 1 )
+			write(2, "\n", 1 );
+		else
+			write(2, "   ", 3 );
+		s=s+1;
+	}
+	exit(0);
+}
+
 int main(int argc, char *argv[])
 {
     char *cp;
@@ -21,26 +114,20 @@ int main(int argc, char *argv[])
     }
     if (argv[1][0] == '-') {
 	cp = &argv[1][1];
-	if (!strncmp(cp, "SIG", 3))
-	    cp += 3;
-	if (!strcmp(cp, "HUP"))
-	    sig = SIGHUP;
-	else if (!strcmp(cp, "INT"))
-	    sig = SIGINT;
-	else if (!strcmp(cp, "QUIT"))
-	    sig = SIGQUIT;
-	else if (!strcmp(cp, "KILL"))
-	    sig = SIGKILL;
-	else if (!strcmp(cp, "TERM"))
-	    sig = SIGTERM;
+	if( *cp=='l' ) 
+		printsigs();
+	if (!strncmp(cp, "SIG", 3)){
+		cp += 3;
+		sig=getsig( cp );
+		if( sig < 0 ) 
+			diesig();
+	}
 	else {
 	    sig = 0;
 	    while (isdigit(*cp))
 		sig = sig * 10 + *cp++ - '0';
-	    if (*cp) {
-		write(2, "kill: unknown signal\n", 21);
-		return 1;
-	    }
+	    if (*cp)
+		    diesig();
 	}
 	argc--;
 	argv++;
-- 
2.34.1