1/*
2 * sigstat - print out useful information about signal arguments
3 *
4 * Chet Ramey
5 * chet@po.cwru.edu
6 */
7
8/* Copyright (C) 1991-2002 Free Software Foundation, Inc.
9
10   This file is part of GNU Bash, the Bourne Again SHell.
11
12   Bash is free software; you can redistribute it and/or modify it under
13   the terms of the GNU General Public License as published by the Free
14   Software Foundation; either version 2, or (at your option) any later
15   version.
16
17   Bash is distributed in the hope that it will be useful, but WITHOUT ANY
18   WARRANTY; without even the implied warranty of MERCHANTABILITY or
19   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
20   for more details.
21
22   You should have received a copy of the GNU General Public License along
23   with Bash; see the file COPYING.  If not, write to the Free Software
24   Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
25
26#include <sys/types.h>
27#include <signal.h>
28#include <stdio.h>
29
30extern char	*strrchr();
31static char	*signames[NSIG];
32
33char	*progname;
34
35void	sigstat();
36
37main(argc, argv)
38int	argc;
39char	**argv;
40{
41	register int	i;
42	char	*t;
43
44	if (t = strrchr(argv[0], '/'))
45		progname = ++t;
46	else
47		progname = argv[0];
48	init_signames();
49	if (argc == 1) {
50		for (i = 1; i < NSIG; i++)
51			sigstat(i);
52		exit(0);
53	}
54	for (i = 1; i < argc; i++)
55		sigstat(atoi(argv[i]));
56	exit(0);
57}
58
59void
60sigstat(sig)
61int	sig;
62{
63	struct sigaction oact;
64	char *signame;
65	sigset_t set, oset;
66	int blocked;
67
68	if (sig < 0 || sig >= NSIG) {
69		fprintf(stderr, "%s: %d: signal out of range\n", progname, sig);
70		return;
71	}
72	signame = signames[sig];
73	sigemptyset(&oset);
74	sigprocmask(SIG_BLOCK, (sigset_t *)NULL, &oset);
75	if (sigismember(&oset, sig))
76		printf("%s: signal is blocked\n", signame);
77	sigaction(sig, (struct sigaction *)NULL, &oact);
78	if (oact.sa_handler == SIG_IGN)
79		printf("%s: signal is ignored\n", signame);
80	else if (oact.sa_handler == SIG_DFL)
81		printf("%s: signal is defaulted\n", signame);
82	else
83		printf("%s: signal is trapped (?)\n", signame);
84}
85
86init_signames()
87{
88	register int i;
89	bzero(signames, sizeof(signames));
90
91#if defined (SIGHUP)		/* hangup */
92  	signames[SIGHUP] = "SIGHUP";
93#endif
94#if defined (SIGINT)		/* interrupt */
95  	signames[SIGINT] = "SIGINT";
96#endif
97#if defined (SIGQUIT)		/* quit */
98  	signames[SIGQUIT] = "SIGQUIT";
99#endif
100#if defined (SIGILL)		/* illegal instruction (not reset when caught) */
101  	signames[SIGILL] = "SIGILL";
102#endif
103#if defined (SIGTRAP)		/* trace trap (not reset when caught) */
104  	signames[SIGTRAP] = "SIGTRAP";
105#endif
106#if defined (SIGABRT)		/*  */
107  	signames[SIGABRT] = "SIGABRT";
108#endif
109#if defined (SIGIOT)		/* IOT instruction */
110  	signames[SIGIOT] = "SIGIOT";
111#endif
112#if defined (SIGEMT)		/* EMT instruction */
113  	signames[SIGEMT] = "SIGEMT";
114#endif
115#if defined (SIGFPE)		/* floating point exception */
116  	signames[SIGFPE] = "SIGFPE";
117#endif
118#if defined (SIGKILL)		/* kill (cannot be caught or ignored) */
119  	signames[SIGKILL] = "SIGKILL";
120#endif
121#if defined (SIGBUS)		/* bus error */
122  	signames[SIGBUS] = "SIGBUS";
123#endif
124#if defined (SIGSEGV)		/* segmentation violation */
125  	signames[SIGSEGV] = "SIGSEGV";
126#endif
127#if defined (SIGSYS)		/* bad argument to system call */
128  	signames[SIGSYS] = "SIGSYS";
129#endif
130#if defined (SIGPIPE)		/* write on a pipe with no one to read it */
131  	signames[SIGPIPE] = "SIGPIPE";
132#endif
133#if defined (SIGALRM)		/* alarm clock */
134  	signames[SIGALRM] = "SIGALRM";
135#endif
136#if defined (SIGTERM)		/* software termination signal from kill */
137  	signames[SIGTERM] = "SIGTERM";
138#endif
139#if defined (SIGCLD)		/* Like SIGCHLD.  */
140  	signames[SIGCLD] = "SIGCLD";
141#endif
142#if defined (SIGPWR)		/* Magic thing for some machines. */
143  	signames[SIGPWR] = "SIGPWR";
144#endif
145#if defined (SIGPOLL)		/* For keyboard input?  */
146  	signames[SIGPOLL] = "SIGPOLL";
147#endif
148#if defined (SIGURG)		/* urgent condition on IO channel */
149  	signames[SIGURG] = "SIGURG";
150#endif
151#if defined (SIGSTOP)		/* sendable stop signal not from tty */
152  	signames[SIGSTOP] = "SIGSTOP";
153#endif
154#if defined (SIGTSTP)		/* stop signal from tty */
155  	signames[SIGTSTP] = "SIGTSTP";
156#endif
157#if defined (SIGCONT)		/* continue a stopped process */
158  	signames[SIGCONT] = "SIGCONT";
159#endif
160#if defined (SIGCHLD)		/* to parent on child stop or exit */
161  	signames[SIGCHLD] = "SIGCHLD";
162#endif
163#if defined (SIGTTIN)		/* to readers pgrp upon background tty read */
164  	signames[SIGTTIN] = "SIGTTIN";
165#endif
166#if defined (SIGTTOU)		/* like TTIN for output if (tp->t_local&LTOSTOP) */
167  	signames[SIGTTOU] = "SIGTTOU";
168#endif
169#if defined (SIGIO)		/* input/output possible signal */
170  	signames[SIGIO] = "SIGIO";
171#endif
172#if defined (SIGXCPU)		/* exceeded CPU time limit */
173  	signames[SIGXCPU] = "SIGXCPU";
174#endif
175#if defined (SIGXFSZ)		/* exceeded file size limit */
176  	signames[SIGXFSZ] = "SIGXFSZ";
177#endif
178#if defined (SIGVTALRM)		/* virtual time alarm */
179  	signames[SIGVTALRM] = "SIGVTALRM";
180#endif
181#if defined (SIGPROF)		/* profiling time alarm */
182  	signames[SIGPROF] = "SIGPROF";
183#endif
184#if defined (SIGWINCH)		/* window changed */
185  	signames[SIGWINCH] = "SIGWINCH";
186#endif
187#if defined (SIGLOST)		/* resource lost (eg, record-lock lost) */
188  	signames[SIGLOST] = "SIGLOST";
189#endif
190#if defined (SIGUSR1)		/* user defined signal 1 */
191  	signames[SIGUSR1] = "SIGUSR1";
192#endif
193#if defined (SIGUSR2)		/* user defined signal 2 */
194  	signames[SIGUSR2] = "SIGUSR2";
195#endif
196#if defined (SIGMSG)	/* HFT input data pending */
197  	signames[SIGMSG] = "SIGMSG";
198#endif
199#if defined (SIGPWR)	/* power failure imminent (save your data) */
200  	signames[SIGPWR] = "SIGPWR";
201#endif
202#if defined (SIGDANGER)	/* system crash imminent */
203  	signames[SIGDANGER] = "SIGDANGER";
204#endif
205#if defined (SIGMIGRATE)	/* migrate process to another CPU */
206  	signames[SIGMIGRATE] = "SIGMIGRATE";
207#endif
208#if defined (SIGPRE)	/* programming error */
209  	signames[SIGPRE] = "SIGPRE";
210#endif
211#if defined (SIGGRANT)	/* HFT monitor mode granted */
212  	signames[SIGGRANT] = "SIGGRANT";
213#endif
214#if defined (SIGRETRACT)	/* HFT monitor mode retracted */
215  	signames[SIGRETRACT] = "SIGRETRACT";
216#endif
217#if defined (SIGSOUND)	/* HFT sound sequence has completed */
218  	signames[SIGSOUND] = "SIGSOUND";
219#endif
220
221	for (i = 0; i < NSIG; i++)
222		if (signames[i] == (char *)NULL) {
223			signames[i] = (char *)malloc (16);;
224			sprintf (signames[i], "signal %d", i);
225	  	}
226}
227