miscbltin.c revision 149018 
1/*-
2 * Copyright (c) 1991, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Kenneth Almquist.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#ifndef lint
34#if 0
35static char sccsid[] = "@(#)miscbltin.c	8.4 (Berkeley) 5/4/95";
36#endif
37#endif /* not lint */
38#include <sys/cdefs.h>
39__FBSDID("$FreeBSD: head/bin/sh/miscbltin.c 149018 2005-08-13 08:31:37Z stefanf $");
40
41/*
42 * Miscellaneous builtins.
43 */
44
45#include <sys/types.h>
46#include <sys/stat.h>
47#include <sys/time.h>
48#include <sys/resource.h>
49#include <unistd.h>
50#include <ctype.h>
51#include <errno.h>
52#include <stdint.h>
53#include <stdio.h>
54#include <stdlib.h>
55#include <termios.h>
56
57#include "shell.h"
58#include "options.h"
59#include "var.h"
60#include "output.h"
61#include "memalloc.h"
62#include "error.h"
63#include "mystring.h"
64
65#undef eflag
66
67int readcmd(int, char **);
68int umaskcmd(int, char **);
69int ulimitcmd(int, char **);
70
71/*
72 * The read builtin.  The -r option causes backslashes to be treated like
73 * ordinary characters.
74 *
75 * This uses unbuffered input, which may be avoidable in some cases.
76 */
77
78int
79readcmd(int argc __unused, char **argv __unused)
80{
81	char **ap;
82	int backslash;
83	char c;
84	int rflag;
85	char *prompt;
86	char *ifs;
87	char *p;
88	int startword;
89	int status;
90	int i;
91	struct timeval tv;
92	char *tvptr;
93	fd_set ifds;
94	struct termios told, tnew;
95	int tsaved;
96
97	rflag = 0;
98	prompt = NULL;
99	tv.tv_sec = -1;
100	tv.tv_usec = 0;
101	while ((i = nextopt("erp:t:")) != '\0') {
102		switch(i) {
103		case 'p':
104			prompt = shoptarg;
105			break;
106		case 'e':
107			break;
108		case 'r':
109			rflag = 1;
110			break;
111		case 't':
112			tv.tv_sec = strtol(shoptarg, &tvptr, 0);
113			if (tvptr == shoptarg)
114				error("timeout value");
115			switch(*tvptr) {
116			case 0:
117			case 's':
118				break;
119			case 'h':
120				tv.tv_sec *= 60;
121				/* FALLTHROUGH */
122			case 'm':
123				tv.tv_sec *= 60;
124				break;
125			default:
126				error("timeout unit");
127			}
128			break;
129		}
130	}
131	if (prompt && isatty(0)) {
132		out2str(prompt);
133		flushall();
134	}
135	if (*(ap = argptr) == NULL)
136		error("arg count");
137	if ((ifs = bltinlookup("IFS", 1)) == NULL)
138		ifs = nullstr;
139
140	if (tv.tv_sec >= 0) {
141		/*
142		 * See if we can disable input processing; this will
143		 * not give the desired result if we are in a pipeline
144		 * and someone upstream is still in line-by-line mode.
145		 */
146		tsaved = 0;
147		if (tcgetattr(0, &told) == 0) {
148			memcpy(&tnew, &told, sizeof(told));
149			cfmakeraw(&tnew);
150			tcsetattr(0, TCSANOW, &tnew);
151			tsaved = 1;
152		}
153		/*
154		 * Wait for something to become available.
155		 */
156		FD_ZERO(&ifds);
157		FD_SET(0, &ifds);
158		status = select(1, &ifds, NULL, NULL, &tv);
159		if (tsaved)
160			tcsetattr(0, TCSANOW, &told);
161		/*
162		 * If there's nothing ready, return an error.
163		 */
164		if (status <= 0)
165			return(1);
166	}
167
168	status = 0;
169	startword = 1;
170	backslash = 0;
171	STARTSTACKSTR(p);
172	for (;;) {
173		if (read(STDIN_FILENO, &c, 1) != 1) {
174			status = 1;
175			break;
176		}
177		if (c == '\0')
178			continue;
179		if (backslash) {
180			backslash = 0;
181			if (c != '\n')
182				STPUTC(c, p);
183			continue;
184		}
185		if (!rflag && c == '\\') {
186			backslash++;
187			continue;
188		}
189		if (c == '\n')
190			break;
191		if (startword && *ifs == ' ' && strchr(ifs, c)) {
192			continue;
193		}
194		startword = 0;
195		if (backslash && c == '\\') {
196			if (read(STDIN_FILENO, &c, 1) != 1) {
197				status = 1;
198				break;
199			}
200			STPUTC(c, p);
201		} else if (ap[1] != NULL && strchr(ifs, c) != NULL) {
202			STACKSTRNUL(p);
203			setvar(*ap, stackblock(), 0);
204			ap++;
205			startword = 1;
206			STARTSTACKSTR(p);
207		} else {
208			STPUTC(c, p);
209		}
210	}
211	STACKSTRNUL(p);
212	setvar(*ap, stackblock(), 0);
213	while (*++ap != NULL)
214		setvar(*ap, nullstr, 0);
215	return status;
216}
217
218
219
220int
221umaskcmd(int argc __unused, char **argv)
222{
223	char *ap;
224	int mask;
225	int i;
226	int symbolic_mode = 0;
227
228	while ((i = nextopt("S")) != '\0') {
229		symbolic_mode = 1;
230	}
231
232	INTOFF;
233	mask = umask(0);
234	umask(mask);
235	INTON;
236
237	if ((ap = *argptr) == NULL) {
238		if (symbolic_mode) {
239			char u[4], g[4], o[4];
240
241			i = 0;
242			if ((mask & S_IRUSR) == 0)
243				u[i++] = 'r';
244			if ((mask & S_IWUSR) == 0)
245				u[i++] = 'w';
246			if ((mask & S_IXUSR) == 0)
247				u[i++] = 'x';
248			u[i] = '\0';
249
250			i = 0;
251			if ((mask & S_IRGRP) == 0)
252				g[i++] = 'r';
253			if ((mask & S_IWGRP) == 0)
254				g[i++] = 'w';
255			if ((mask & S_IXGRP) == 0)
256				g[i++] = 'x';
257			g[i] = '\0';
258
259			i = 0;
260			if ((mask & S_IROTH) == 0)
261				o[i++] = 'r';
262			if ((mask & S_IWOTH) == 0)
263				o[i++] = 'w';
264			if ((mask & S_IXOTH) == 0)
265				o[i++] = 'x';
266			o[i] = '\0';
267
268			out1fmt("u=%s,g=%s,o=%s\n", u, g, o);
269		} else {
270			out1fmt("%.4o\n", mask);
271		}
272	} else {
273		if (isdigit(*ap)) {
274			mask = 0;
275			do {
276				if (*ap >= '8' || *ap < '0')
277					error("Illegal number: %s", argv[1]);
278				mask = (mask << 3) + (*ap - '0');
279			} while (*++ap != '\0');
280			umask(mask);
281		} else {
282			void *set;
283			if ((set = setmode (ap)) == 0)
284				error("Illegal number: %s", ap);
285
286			mask = getmode (set, ~mask & 0777);
287			umask(~mask & 0777);
288			free(set);
289		}
290	}
291	return 0;
292}
293
294/*
295 * ulimit builtin
296 *
297 * This code, originally by Doug Gwyn, Doug Kingston, Eric Gisin, and
298 * Michael Rendell was ripped from pdksh 5.0.8 and hacked for use with
299 * ash by J.T. Conklin.
300 *
301 * Public domain.
302 */
303
304struct limits {
305	const char *name;
306	const char *units;
307	int	cmd;
308	int	factor;	/* multiply by to get rlim_{cur,max} values */
309	char	option;
310};
311
312static const struct limits limits[] = {
313#ifdef RLIMIT_CPU
314	{ "cpu time",		"seconds",	RLIMIT_CPU,	   1, 't' },
315#endif
316#ifdef RLIMIT_FSIZE
317	{ "file size",		"512-blocks",	RLIMIT_FSIZE,	 512, 'f' },
318#endif
319#ifdef RLIMIT_DATA
320	{ "data seg size",	"kbytes",	RLIMIT_DATA,	1024, 'd' },
321#endif
322#ifdef RLIMIT_STACK
323	{ "stack size",		"kbytes",	RLIMIT_STACK,	1024, 's' },
324#endif
325#ifdef  RLIMIT_CORE
326	{ "core file size",	"512-blocks",	RLIMIT_CORE,	 512, 'c' },
327#endif
328#ifdef RLIMIT_RSS
329	{ "max memory size",	"kbytes",	RLIMIT_RSS,	1024, 'm' },
330#endif
331#ifdef RLIMIT_MEMLOCK
332	{ "locked memory",	"kbytes",	RLIMIT_MEMLOCK, 1024, 'l' },
333#endif
334#ifdef RLIMIT_NPROC
335	{ "max user processes",	(char *)0,	RLIMIT_NPROC,      1, 'u' },
336#endif
337#ifdef RLIMIT_NOFILE
338	{ "open files",		(char *)0,	RLIMIT_NOFILE,     1, 'n' },
339#endif
340#ifdef RLIMIT_VMEM
341	{ "virtual mem size",	"kbytes",	RLIMIT_VMEM,	1024, 'v' },
342#endif
343#ifdef RLIMIT_SWAP
344	{ "swap limit",		"kbytes",	RLIMIT_SWAP,	1024, 'w' },
345#endif
346#ifdef RLIMIT_SBSIZE
347	{ "sbsize",		"bytes",	RLIMIT_SBSIZE,	   1, 'b' },
348#endif
349	{ (char *) 0,		(char *)0,	0,		   0, '\0' }
350};
351
352int
353ulimitcmd(int argc __unused, char **argv __unused)
354{
355	int	c;
356	rlim_t val = 0;
357	enum { SOFT = 0x1, HARD = 0x2 }
358			how = SOFT | HARD;
359	const struct limits	*l;
360	int		set, all = 0;
361	int		optc, what;
362	struct rlimit	limit;
363
364	what = 'f';
365	while ((optc = nextopt("HSatfdsmcnuvlb")) != '\0')
366		switch (optc) {
367		case 'H':
368			how = HARD;
369			break;
370		case 'S':
371			how = SOFT;
372			break;
373		case 'a':
374			all = 1;
375			break;
376		default:
377			what = optc;
378		}
379
380	for (l = limits; l->name && l->option != what; l++)
381		;
382	if (!l->name)
383		error("internal error (%c)", what);
384
385	set = *argptr ? 1 : 0;
386	if (set) {
387		char *p = *argptr;
388
389		if (all || argptr[1])
390			error("too many arguments");
391		if (strcmp(p, "unlimited") == 0)
392			val = RLIM_INFINITY;
393		else {
394			val = 0;
395
396			while ((c = *p++) >= '0' && c <= '9')
397			{
398				val = (val * 10) + (long)(c - '0');
399				if (val < 0)
400					break;
401			}
402			if (c)
403				error("bad number");
404			val *= l->factor;
405		}
406	}
407	if (all) {
408		for (l = limits; l->name; l++) {
409			char optbuf[40];
410			if (getrlimit(l->cmd, &limit) < 0)
411				error("can't get limit: %s", strerror(errno));
412			if (how & SOFT)
413				val = limit.rlim_cur;
414			else if (how & HARD)
415				val = limit.rlim_max;
416
417			if (l->units)
418				snprintf(optbuf, sizeof(optbuf),
419					"(%s, -%c) ", l->units, l->option);
420			else
421				snprintf(optbuf, sizeof(optbuf),
422					"(-%c) ", l->option);
423			out1fmt("%-18s %18s ", l->name, optbuf);
424			if (val == RLIM_INFINITY)
425				out1fmt("unlimited\n");
426			else
427			{
428				val /= l->factor;
429				out1fmt("%jd\n", (intmax_t)val);
430			}
431		}
432		return 0;
433	}
434
435	if (getrlimit(l->cmd, &limit) < 0)
436		error("can't get limit: %s", strerror(errno));
437	if (set) {
438		if (how & SOFT)
439			limit.rlim_cur = val;
440		if (how & HARD)
441			limit.rlim_max = val;
442		if (setrlimit(l->cmd, &limit) < 0)
443			error("bad limit: %s", strerror(errno));
444	} else {
445		if (how & SOFT)
446			val = limit.rlim_cur;
447		else if (how & HARD)
448			val = limit.rlim_max;
449
450		if (val == RLIM_INFINITY)
451			out1fmt("unlimited\n");
452		else
453		{
454			val /= l->factor;
455			out1fmt("%jd\n", (intmax_t)val);
456		}
457	}
458	return 0;
459}
460