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miscbltin.c revision 1.26 
      1 /*	$NetBSD: miscbltin.c,v 1.26 1998/09/24 17:49:48 itohy Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1991, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Kenneth Almquist.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 #ifndef lint
     41 #if 0
     42 static char sccsid[] = "@(#)miscbltin.c	8.4 (Berkeley) 5/4/95";
     43 #else
     44 __RCSID("$NetBSD: miscbltin.c,v 1.26 1998/09/24 17:49:48 itohy Exp $");
     45 #endif
     46 #endif /* not lint */
     47 
     48 /*
     49  * Miscelaneous builtins.
     50  */
     51 
     52 #include <sys/types.h>		/* quad_t */
     53 #include <sys/param.h>		/* BSD4_4 */
     54 #include <sys/stat.h>
     55 #include <sys/time.h>
     56 #include <sys/resource.h>
     57 #include <unistd.h>
     58 #include <ctype.h>
     59 
     60 #include "shell.h"
     61 #include "options.h"
     62 #include "var.h"
     63 #include "output.h"
     64 #include "memalloc.h"
     65 #include "error.h"
     66 #include "miscbltin.h"
     67 #include "mystring.h"
     68 
     69 #undef rflag
     70 
     71 extern char **argptr;		/* argument list for builtin command */
     72 
     73 
     74 /*
     75  * The read builtin.  The -e option causes backslashes to escape the
     76  * following character.
     77  *
     78  * This uses unbuffered input, which may be avoidable in some cases.
     79  */
     80 
     81 int
     82 readcmd(argc, argv)
     83 	int argc;
     84 	char **argv;
     85 {
     86 	char **ap;
     87 	int backslash;
     88 	char c;
     89 	int rflag;
     90 	char *prompt;
     91 	char *ifs;
     92 	char *p;
     93 	int startword;
     94 	int status;
     95 	int i;
     96 
     97 	rflag = 0;
     98 	prompt = NULL;
     99 	while ((i = nextopt("p:r")) != '\0') {
    100 		if (i == 'p')
    101 			prompt = optarg;
    102 		else
    103 			rflag = 1;
    104 	}
    105 	if (prompt && isatty(0)) {
    106 		out2str(prompt);
    107 		flushall();
    108 	}
    109 	if (*(ap = argptr) == NULL)
    110 		error("arg count");
    111 	if ((ifs = bltinlookup("IFS", 1)) == NULL)
    112 		ifs = nullstr;
    113 	status = 0;
    114 	startword = 1;
    115 	backslash = 0;
    116 	STARTSTACKSTR(p);
    117 	for (;;) {
    118 		if (read(0, &c, 1) != 1) {
    119 			status = 1;
    120 			break;
    121 		}
    122 		if (c == '\0')
    123 			continue;
    124 		if (backslash) {
    125 			backslash = 0;
    126 			if (c != '\n')
    127 				STPUTC(c, p);
    128 			continue;
    129 		}
    130 		if (!rflag && c == '\\') {
    131 			backslash++;
    132 			continue;
    133 		}
    134 		if (c == '\n')
    135 			break;
    136 		if (startword && *ifs == ' ' && strchr(ifs, c)) {
    137 			continue;
    138 		}
    139 		startword = 0;
    140 		if (backslash && c == '\\') {
    141 			if (read(0, &c, 1) != 1) {
    142 				status = 1;
    143 				break;
    144 			}
    145 			STPUTC(c, p);
    146 		} else if (ap[1] != NULL && strchr(ifs, c) != NULL) {
    147 			STACKSTRNUL(p);
    148 			setvar(*ap, stackblock(), 0);
    149 			ap++;
    150 			startword = 1;
    151 			STARTSTACKSTR(p);
    152 		} else {
    153 			STPUTC(c, p);
    154 		}
    155 	}
    156 	STACKSTRNUL(p);
    157 	/* Remove trailing blanks */
    158 	while (stackblock() <= --p && strchr(ifs, *p) != NULL)
    159 		*p = '\0';
    160 	setvar(*ap, stackblock(), 0);
    161 	while (*++ap != NULL)
    162 		setvar(*ap, nullstr, 0);
    163 	return status;
    164 }
    165 
    166 
    167 
    168 int
    169 umaskcmd(argc, argv)
    170 	int argc;
    171 	char **argv;
    172 {
    173 	char *ap;
    174 	int mask;
    175 	int i;
    176 	int symbolic_mode = 0;
    177 
    178 	while ((i = nextopt("S")) != '\0') {
    179 		symbolic_mode = 1;
    180 	}
    181 
    182 	INTOFF;
    183 	mask = umask(0);
    184 	umask(mask);
    185 	INTON;
    186 
    187 	if ((ap = *argptr) == NULL) {
    188 		if (symbolic_mode) {
    189 			char u[4], g[4], o[4];
    190 
    191 			i = 0;
    192 			if ((mask & S_IRUSR) == 0)
    193 				u[i++] = 'r';
    194 			if ((mask & S_IWUSR) == 0)
    195 				u[i++] = 'w';
    196 			if ((mask & S_IXUSR) == 0)
    197 				u[i++] = 'x';
    198 			u[i] = '\0';
    199 
    200 			i = 0;
    201 			if ((mask & S_IRGRP) == 0)
    202 				g[i++] = 'r';
    203 			if ((mask & S_IWGRP) == 0)
    204 				g[i++] = 'w';
    205 			if ((mask & S_IXGRP) == 0)
    206 				g[i++] = 'x';
    207 			g[i] = '\0';
    208 
    209 			i = 0;
    210 			if ((mask & S_IROTH) == 0)
    211 				o[i++] = 'r';
    212 			if ((mask & S_IWOTH) == 0)
    213 				o[i++] = 'w';
    214 			if ((mask & S_IXOTH) == 0)
    215 				o[i++] = 'x';
    216 			o[i] = '\0';
    217 
    218 			out1fmt("u=%s,g=%s,o=%s\n", u, g, o);
    219 		} else {
    220 			out1fmt("%.4o\n", mask);
    221 		}
    222 	} else {
    223 		if (isdigit((unsigned char)*ap)) {
    224 			mask = 0;
    225 			do {
    226 				if (*ap >= '8' || *ap < '0')
    227 					error("Illegal number: %s", argv[1]);
    228 				mask = (mask << 3) + (*ap - '0');
    229 			} while (*++ap != '\0');
    230 			umask(mask);
    231 		} else {
    232 			void *set;
    233 
    234 			INTOFF;
    235 			if ((set = setmode(ap)) != 0) {
    236 				mask = getmode(set, ~mask & 0777);
    237 				ckfree(set);
    238 			}
    239 			INTON;
    240 			if (!set)
    241 				error("Illegal mode: %s", ap);
    242 
    243 			umask(~mask & 0777);
    244 		}
    245 	}
    246 	return 0;
    247 }
    248 
    249 /*
    250  * ulimit builtin
    251  *
    252  * This code, originally by Doug Gwyn, Doug Kingston, Eric Gisin, and
    253  * Michael Rendell was ripped from pdksh 5.0.8 and hacked for use with
    254  * ash by J.T. Conklin.
    255  *
    256  * Public domain.
    257  */
    258 
    259 struct limits {
    260 	const char *name;
    261 	int	cmd;
    262 	int	factor;	/* multiply by to get rlim_{cur,max} values */
    263 	char	option;
    264 };
    265 
    266 static const struct limits limits[] = {
    267 #ifdef RLIMIT_CPU
    268 	{ "time(seconds)",		RLIMIT_CPU,	   1, 't' },
    269 #endif
    270 #ifdef RLIMIT_FSIZE
    271 	{ "file(blocks)",		RLIMIT_FSIZE,	 512, 'f' },
    272 #endif
    273 #ifdef RLIMIT_DATA
    274 	{ "data(kbytes)",		RLIMIT_DATA,	1024, 'd' },
    275 #endif
    276 #ifdef RLIMIT_STACK
    277 	{ "stack(kbytes)",		RLIMIT_STACK,	1024, 's' },
    278 #endif
    279 #ifdef  RLIMIT_CORE
    280 	{ "coredump(blocks)",		RLIMIT_CORE,	 512, 'c' },
    281 #endif
    282 #ifdef RLIMIT_RSS
    283 	{ "memory(kbytes)",		RLIMIT_RSS,	1024, 'm' },
    284 #endif
    285 #ifdef RLIMIT_MEMLOCK
    286 	{ "locked memory(kbytes)",	RLIMIT_MEMLOCK, 1024, 'l' },
    287 #endif
    288 #ifdef RLIMIT_NPROC
    289 	{ "process(processes)",		RLIMIT_NPROC,      1, 'p' },
    290 #endif
    291 #ifdef RLIMIT_NOFILE
    292 	{ "nofiles(descriptors)",	RLIMIT_NOFILE,     1, 'n' },
    293 #endif
    294 #ifdef RLIMIT_VMEM
    295 	{ "vmemory(kbytes)",		RLIMIT_VMEM,	1024, 'v' },
    296 #endif
    297 #ifdef RLIMIT_SWAP
    298 	{ "swap(kbytes)",		RLIMIT_SWAP,	1024, 'w' },
    299 #endif
    300 	{ (char *) 0,			0,		   0,  '\0' }
    301 };
    302 
    303 int
    304 ulimitcmd(argc, argv)
    305 	int argc;
    306 	char **argv;
    307 {
    308 	int	c;
    309 	rlim_t val = 0;
    310 	enum { SOFT = 0x1, HARD = 0x2 }
    311 			how = SOFT | HARD;
    312 	const struct limits	*l;
    313 	int		set, all = 0;
    314 	int		optc, what;
    315 	struct rlimit	limit;
    316 
    317 	what = 'f';
    318 	while ((optc = nextopt("HSatfdsmcnpl")) != '\0')
    319 		switch (optc) {
    320 		case 'H':
    321 			how = HARD;
    322 			break;
    323 		case 'S':
    324 			how = SOFT;
    325 			break;
    326 		case 'a':
    327 			all = 1;
    328 			break;
    329 		default:
    330 			what = optc;
    331 		}
    332 
    333 	for (l = limits; l->name && l->option != what; l++)
    334 		;
    335 	if (!l->name)
    336 		error("ulimit: internal error (%c)\n", what);
    337 
    338 	set = *argptr ? 1 : 0;
    339 	if (set) {
    340 		char *p = *argptr;
    341 
    342 		if (all || argptr[1])
    343 			error("ulimit: too many arguments\n");
    344 		if (strcmp(p, "unlimited") == 0)
    345 			val = RLIM_INFINITY;
    346 		else {
    347 			val = (rlim_t) 0;
    348 
    349 			while ((c = *p++) >= '0' && c <= '9')
    350 			{
    351 				val = (val * 10) + (long)(c - '0');
    352 				if (val < (rlim_t) 0)
    353 					break;
    354 			}
    355 			if (c)
    356 				error("ulimit: bad number\n");
    357 			val *= l->factor;
    358 		}
    359 	}
    360 	if (all) {
    361 		for (l = limits; l->name; l++) {
    362 			getrlimit(l->cmd, &limit);
    363 			if (how & SOFT)
    364 				val = limit.rlim_cur;
    365 			else if (how & HARD)
    366 				val = limit.rlim_max;
    367 
    368 			out1fmt("%-20s ", l->name);
    369 			if (val == RLIM_INFINITY)
    370 				out1fmt("unlimited\n");
    371 			else
    372 			{
    373 				val /= l->factor;
    374 #ifdef BSD4_4
    375 				out1fmt("%qd\n", (long long) val);
    376 #else
    377 				out1fmt("%ld\n", (long) val);
    378 #endif
    379 			}
    380 		}
    381 		return 0;
    382 	}
    383 
    384 	getrlimit(l->cmd, &limit);
    385 	if (set) {
    386 		if (how & SOFT)
    387 			limit.rlim_cur = val;
    388 		if (how & HARD)
    389 			limit.rlim_max = val;
    390 		if (setrlimit(l->cmd, &limit) < 0)
    391 			error("ulimit: bad limit\n");
    392 	} else {
    393 		if (how & SOFT)
    394 			val = limit.rlim_cur;
    395 		else if (how & HARD)
    396 			val = limit.rlim_max;
    397 
    398 		if (val == RLIM_INFINITY)
    399 			out1fmt("unlimited\n");
    400 		else
    401 		{
    402 			val /= l->factor;
    403 #ifdef BSD4_4
    404 			out1fmt("%qd\n", (long long) val);
    405 #else
    406 			out1fmt("%ld\n", (long) val);
    407 #endif
    408 		}
    409 	}
    410 	return 0;
    411 }
    412