1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
|
/* $OpenBSD: ex_shell.c,v 1.9 2002/06/12 06:07:17 mpech Exp $ */
/*-
* Copyright (c) 1992, 1993, 1994
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1992, 1993, 1994, 1995, 1996
* Keith Bostic. All rights reserved.
*
* See the LICENSE file for redistribution information.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)ex_shell.c 10.38 (Berkeley) 8/19/96";
#endif /* not lint */
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/wait.h>
#include <bitstring.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "../common/common.h"
static const char *sigmsg(int);
/*
* ex_shell -- :sh[ell]
* Invoke the program named in the SHELL environment variable
* with the argument -i.
*
* PUBLIC: int ex_shell(SCR *, EXCMD *);
*/
int
ex_shell(sp, cmdp)
SCR *sp;
EXCMD *cmdp;
{
int rval;
char buf[MAXPATHLEN];
/* We'll need a shell. */
if (opts_empty(sp, O_SHELL, 0))
return (1);
/*
* XXX
* Assumes all shells use -i.
*/
(void)snprintf(buf, sizeof(buf), "%s -i", O_STR(sp, O_SHELL));
/* Restore the window name. */
(void)sp->gp->scr_rename(sp, NULL, 0);
/* If we're still in a vi screen, move out explicitly. */
rval = ex_exec_proc(sp, cmdp, buf, NULL, !F_ISSET(sp, SC_SCR_EXWROTE));
/* Set the window name. */
(void)sp->gp->scr_rename(sp, sp->frp->name, 1);
/*
* !!!
* Historically, vi didn't require a continue message after the
* return of the shell. Match it.
*/
F_SET(sp, SC_EX_WAIT_NO);
return (rval);
}
/*
* ex_exec_proc --
* Run a separate process.
*
* PUBLIC: int ex_exec_proc(SCR *, EXCMD *, char *, const char *, int);
*/
int
ex_exec_proc(sp, cmdp, cmd, msg, need_newline)
SCR *sp;
EXCMD *cmdp;
char *cmd;
const char *msg;
int need_newline;
{
GS *gp;
const char *name;
pid_t pid;
gp = sp->gp;
/* We'll need a shell. */
if (opts_empty(sp, O_SHELL, 0))
return (1);
/* Enter ex mode. */
if (F_ISSET(sp, SC_VI)) {
if (gp->scr_screen(sp, SC_EX)) {
ex_emsg(sp, cmdp->cmd->name, EXM_NOCANON);
return (1);
}
(void)gp->scr_attr(sp, SA_ALTERNATE, 0);
F_SET(sp, SC_SCR_EX | SC_SCR_EXWROTE);
}
/* Put out additional newline, message. */
if (need_newline)
(void)ex_puts(sp, "\n");
if (msg != NULL) {
(void)ex_puts(sp, msg);
(void)ex_puts(sp, "\n");
}
(void)ex_fflush(sp);
switch (pid = vfork()) {
case -1: /* Error. */
msgq(sp, M_SYSERR, "vfork");
return (1);
case 0: /* Utility. */
if ((name = strrchr(O_STR(sp, O_SHELL), '/')) == NULL)
name = O_STR(sp, O_SHELL);
else
++name;
execl(O_STR(sp, O_SHELL), name, "-c", cmd, (char *)NULL);
msgq_str(sp, M_SYSERR, O_STR(sp, O_SHELL), "execl: %s");
_exit(127);
/* NOTREACHED */
default: /* Parent. */
return (proc_wait(sp, pid, cmd, 0, 0));
}
/* NOTREACHED */
}
/*
* proc_wait --
* Wait for one of the processes.
*
* !!!
* The pid_t type varies in size from a short to a long depending on the
* system. It has to be cast into something or the standard promotion
* rules get you. I'm using a long based on the belief that nobody is
* going to make it unsigned and it's unlikely to be a quad.
*
* PUBLIC: int proc_wait(SCR *, pid_t, const char *, int, int);
*/
int
proc_wait(sp, pid, cmd, silent, okpipe)
SCR *sp;
pid_t pid;
const char *cmd;
int silent, okpipe;
{
size_t len;
int nf, pstat;
char *p;
/* Wait for the utility, ignoring interruptions. */
for (;;) {
errno = 0;
if (waitpid(pid, &pstat, 0) != -1)
break;
if (errno != EINTR) {
msgq(sp, M_SYSERR, "waitpid");
return (1);
}
}
/*
* Display the utility's exit status. Ignore SIGPIPE from the
* parent-writer, as that only means that the utility chose to
* exit before reading all of its input.
*/
if (WIFSIGNALED(pstat) && (!okpipe || WTERMSIG(pstat) != SIGPIPE)) {
for (; isblank(*cmd); ++cmd);
p = msg_print(sp, cmd, &nf);
len = strlen(p);
msgq(sp, M_ERR, "%.*s%s: received signal: %s%s",
MIN(len, 20), p, len > 20 ? " ..." : "",
sigmsg(WTERMSIG(pstat)),
WCOREDUMP(pstat) ? "; core dumped" : "");
if (nf)
FREE_SPACE(sp, p, 0);
return (1);
}
if (WIFEXITED(pstat) && WEXITSTATUS(pstat)) {
/*
* Remain silent for "normal" errors when doing shell file
* name expansions, they almost certainly indicate nothing
* more than a failure to match.
*
* Remain silent for vi read filter errors. It's historic
* practice.
*/
if (!silent) {
for (; isblank(*cmd); ++cmd);
p = msg_print(sp, cmd, &nf);
len = strlen(p);
msgq(sp, M_ERR, "%.*s%s: exited with status %d",
MIN(len, 20), p, len > 20 ? " ..." : "",
WEXITSTATUS(pstat));
if (nf)
FREE_SPACE(sp, p, 0);
}
return (1);
}
return (0);
}
/*
* XXX
* The sys_siglist[] table in the C library has this information, but there's
* no portable way to get to it. (Believe me, I tried.)
*/
typedef struct _sigs {
int number; /* signal number */
char *message; /* related message */
} SIGS;
SIGS const sigs[] = {
#ifdef SIGABRT
SIGABRT, "Abort trap",
#endif
#ifdef SIGALRM
SIGALRM, "Alarm clock",
#endif
#ifdef SIGBUS
SIGBUS, "Bus error",
#endif
#ifdef SIGCLD
SIGCLD, "Child exited or stopped",
#endif
#ifdef SIGCHLD
SIGCHLD, "Child exited",
#endif
#ifdef SIGCONT
SIGCONT, "Continued",
#endif
#ifdef SIGDANGER
SIGDANGER, "System crash imminent",
#endif
#ifdef SIGEMT
SIGEMT, "EMT trap",
#endif
#ifdef SIGFPE
SIGFPE, "Floating point exception",
#endif
#ifdef SIGGRANT
SIGGRANT, "HFT monitor mode granted",
#endif
#ifdef SIGHUP
SIGHUP, "Hangup",
#endif
#ifdef SIGILL
SIGILL, "Illegal instruction",
#endif
#ifdef SIGINFO
SIGINFO, "Information request",
#endif
#ifdef SIGINT
SIGINT, "Interrupt",
#endif
#ifdef SIGIO
SIGIO, "I/O possible",
#endif
#ifdef SIGIOT
SIGIOT, "IOT trap",
#endif
#ifdef SIGKILL
SIGKILL, "Killed",
#endif
#ifdef SIGLOST
SIGLOST, "Record lock",
#endif
#ifdef SIGMIGRATE
SIGMIGRATE, "Migrate process to another CPU",
#endif
#ifdef SIGMSG
SIGMSG, "HFT input data pending",
#endif
#ifdef SIGPIPE
SIGPIPE, "Broken pipe",
#endif
#ifdef SIGPOLL
SIGPOLL, "I/O possible",
#endif
#ifdef SIGPRE
SIGPRE, "Programming error",
#endif
#ifdef SIGPROF
SIGPROF, "Profiling timer expired",
#endif
#ifdef SIGPWR
SIGPWR, "Power failure imminent",
#endif
#ifdef SIGRETRACT
SIGRETRACT, "HFT monitor mode retracted",
#endif
#ifdef SIGQUIT
SIGQUIT, "Quit",
#endif
#ifdef SIGSAK
SIGSAK, "Secure Attention Key",
#endif
#ifdef SIGSEGV
SIGSEGV, "Segmentation fault",
#endif
#ifdef SIGSOUND
SIGSOUND, "HFT sound sequence completed",
#endif
#ifdef SIGSTOP
SIGSTOP, "Suspended (signal)",
#endif
#ifdef SIGSYS
SIGSYS, "Bad system call",
#endif
#ifdef SIGTERM
SIGTERM, "Terminated",
#endif
#ifdef SIGTRAP
SIGTRAP, "Trace/BPT trap",
#endif
#ifdef SIGTSTP
SIGTSTP, "Suspended",
#endif
#ifdef SIGTTIN
SIGTTIN, "Stopped (tty input)",
#endif
#ifdef SIGTTOU
SIGTTOU, "Stopped (tty output)",
#endif
#ifdef SIGURG
SIGURG, "Urgent I/O condition",
#endif
#ifdef SIGUSR1
SIGUSR1, "User defined signal 1",
#endif
#ifdef SIGUSR2
SIGUSR2, "User defined signal 2",
#endif
#ifdef SIGVTALRM
SIGVTALRM, "Virtual timer expired",
#endif
#ifdef SIGWINCH
SIGWINCH, "Window size changes",
#endif
#ifdef SIGXCPU
SIGXCPU, "Cputime limit exceeded",
#endif
#ifdef SIGXFSZ
SIGXFSZ, "Filesize limit exceeded",
#endif
};
/*
* sigmsg --
* Return a pointer to a message describing a signal.
*/
static const char *
sigmsg(signo)
int signo;
{
static char buf[40];
const SIGS *sigp;
int n;
for (n = 0,
sigp = &sigs[0]; n < sizeof(sigs) / sizeof(sigs[0]); ++n, ++sigp)
if (sigp->number == signo)
return (sigp->message);
(void)snprintf(buf, sizeof(buf), "Unknown signal: %d", signo);
return (buf);
}
|
