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miscbltin.c revision 1.57 
      1 /*	$NetBSD: miscbltin.c,v 1.57 2025/07/03 03:54:40 kre 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. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 #include <sys/cdefs.h>
     36 #ifndef lint
     37 #if 0
     38 static char sccsid[] = "@(#)miscbltin.c	8.4 (Berkeley) 5/4/95";
     39 #else
     40 __RCSID("$NetBSD: miscbltin.c,v 1.57 2025/07/03 03:54:40 kre Exp $");
     41 #endif
     42 #endif /* not lint */
     43 
     44 /*
     45  * Miscellaneous builtins.
     46  */
     47 
     48 #include <sys/param.h>		/* BSD4_4 */
     49 #include <sys/resource.h>
     50 #include <sys/stat.h>
     51 #include <sys/time.h>
     52 #include <sys/types.h>		/* quad_t */
     53 
     54 #include <ctype.h>
     55 #include <errno.h>
     56 #include <limits.h>
     57 #include <stdlib.h>
     58 #ifndef SMALL
     59 #include <termios.h>
     60 #endif
     61 #include <unistd.h>
     62 
     63 #include "shell.h"
     64 #include "syntax.h"
     65 #include "options.h"
     66 #include "var.h"
     67 #include "input.h"		/* for whichprompt */
     68 #include "output.h"
     69 #include "parser.h"		/* for getprompt() */
     70 #include "memalloc.h"
     71 #include "error.h"
     72 #include "builtins.h"
     73 #include "mystring.h"
     74 #include "redir.h"		/* for user_fd_limit */
     75 
     76 /*
     77  * The read builtin.
     78  * Backslashes escape the next char unless -r is specified.
     79  *
     80  * This uses unbuffered input, which may be avoidable in some cases.
     81  *
     82  * Note that if IFS=' :' then read x y should work so that:
     83  * 'a b'	x='a', y='b'
     84  * ' a b '	x='a', y='b'
     85  * ':b'		x='',  y='b'
     86  * ':'		x='',  y=''
     87  * '::'		x='',  y=''
     88  * ': :'	x='',  y=''
     89  * ':::'	x='',  y='::'
     90  * ':b c:'	x='',  y='b c:'
     91  */
     92 
     93 #ifndef SMALL
     94 static int b_flag;
     95 
     96 static int
     97 setrawmode(int fd, int on, int end, struct termios *t)
     98 {
     99 	struct termios n;
    100 
    101 	if (on) {
    102 		if (tcgetattr(fd, t) != 0)
    103 			return 0;
    104 		n = *t;
    105 		if (on == 1 && b_flag) {
    106 			n.c_cc[VEOL] = end;
    107 		} else {
    108 			cfmakeraw(&n);
    109 			n.c_iflag |= ICRNL;
    110 			n.c_oflag = t->c_oflag;
    111 			n.c_lflag |= ECHO | ISIG;
    112 		}
    113 		if (tcsetattr(fd, TCSADRAIN | TCSASOFT, &n) == 0)
    114 			return 1;
    115 	} else
    116 		(void)tcsetattr(fd, TCSADRAIN | TCSASOFT, t);
    117 	return 0;
    118 }
    119 
    120 static int
    121 is_a_pipe(int fd)
    122 {
    123 	if (lseek(fd, 0, SEEK_CUR) == -1 && errno == ESPIPE) {
    124 		errno = 0;
    125 		return 1;
    126 	}
    127 	return 0;
    128 }
    129 
    130 #define	READ_BUFFER_SIZE	512
    131 
    132 static int
    133 next_read_char(int fd, size_t max)
    134 {
    135 	static char buffer[READ_BUFFER_SIZE];
    136 	static int pos = 0, len = 0;
    137 
    138 	if (max == 0) {
    139 		pos = len = 0;
    140 		return -1;
    141 	}
    142 	if (max == (size_t)-1) {
    143 		/*
    144 		 * If possible, and necessary, rewind the file
    145 		 * so unprocessed data  can be read again next time
    146 		 *
    147 		 * If that fails, never mind (-b allows that to happen)
    148 		 */
    149 		if (b_flag && pos < len)
    150 			(void)lseek(fd, (off_t)(pos - len), SEEK_CUR);
    151 		return -1;
    152 	}
    153 
    154 	if (b_flag == 0) {
    155 		char c;
    156 
    157 		(void) max;
    158 		if (read(fd, &c, 1) != 1)
    159 			return -1;
    160 		return (c & 0xFF);
    161 	}
    162 
    163 	if (pos >= len) {
    164 		pos = 0;
    165 		if (max > sizeof buffer)
    166 			max = sizeof buffer;
    167 		len = read(fd, buffer, max);
    168 		if (len <= 0)
    169 			return -1;
    170 	}
    171 
    172 	return buffer[pos++] & 0xFF;
    173 }
    174 
    175 #define READ_OPTS	"bd:n:p:r"
    176 
    177 #else
    178 
    179 static inline int
    180 next_read_char(int fd, size_t max)
    181 {
    182 	char c;
    183 
    184 	if (max == 0 || max == (size_t)-1)
    185 		return 0;
    186 
    187 	if (read(fd, &c, 1) != 1)
    188 		return -1;
    189 	return (c & 0xFF);
    190 }
    191 
    192 #define n_flag 0
    193 #define maxlen 0
    194 
    195 #define READ_OPTS	"d:p:r"
    196 
    197 #endif
    198 
    199 int
    200 readcmd(int argc, char **argv)
    201 {
    202 	char **ap;
    203 	int c;
    204 	char end;
    205 	int r_flag;
    206 	char *prompt;
    207 	const char *ifs;
    208 	char *p;
    209 	int startword;
    210 	int status;
    211 	int i;
    212 	int is_ifs;
    213 	int saveall = 0;
    214 	int read_tty = 0;
    215 	ptrdiff_t wordlen = 0;
    216 	char *newifs = NULL;
    217 	struct stackmark mk;
    218 
    219 #ifndef SMALL
    220 	struct termios ttystate;
    221 	int n_flag, maxlen;
    222 	int setraw = 0;
    223 
    224 	b_flag = 0;
    225 	n_flag = 0;
    226 	maxlen = READ_BUFFER_SIZE - 1;
    227 #endif
    228 
    229 	end = '\n';				/* record delimiter */
    230 	r_flag = 0;
    231 	prompt = NULL;
    232 	whichprompt = 2;			/* for continuation lines */
    233 
    234 	while ((i = nextopt(READ_OPTS)) != '\0') {
    235 		switch (i) {
    236 		case 'd':
    237 			end = *optionarg;	/* even if '\0' */
    238 			break;
    239 		case 'p':
    240 			prompt = optionarg;
    241 			break;
    242 		case 'r':
    243 			r_flag = 1;
    244 			break;
    245 #ifndef SMALL
    246 		case 'n':
    247 			maxlen = number(optionarg);
    248 			if (maxlen > (INT_MAX >> 8) + 1)	/* sanity */
    249 				error("-n %s too large", optionarg);
    250 			n_flag = 1;
    251 			break;
    252 		case 'b':
    253 			if (!is_a_pipe(0))
    254 				b_flag = 1;
    255 			break;
    256 #endif
    257 		}
    258 	}
    259 
    260 	if (*(ap = argptr) == NULL)
    261 		error("variable name required\n"
    262 #ifdef SMALL
    263 		      "Usage: read [-r] [-d C] [-p prompt] var...");
    264 #else
    265 		      "Usage: read [-br] [-d C] [-n len] [-p prompt] var...");
    266 
    267 	while (*ap != NULL) {
    268 		if (!validname(*ap, '\0', NULL))
    269 			error("'%s': invalid variable name", *ap);
    270 		ap++;
    271 	}
    272 	ap = argptr;
    273 
    274 	(void)next_read_char(0, 0);	/* make sure the buffer is empty */
    275 #endif
    276 
    277 	if (isatty(0)) {
    278 		read_tty = 1;
    279 		if (prompt) {
    280 			out2str(prompt);
    281 			flushall();
    282 		}
    283 #ifndef SMALL
    284 		b_flag = 1;	/* always buffer reads from ttys */
    285 
    286 		if (n_flag || end != '\n')
    287 			setraw = setrawmode(0, 1 + n_flag, end, &ttystate);
    288 #endif
    289 	}
    290 
    291 	if ((ifs = bltinlookup("IFS", 1)) == NULL)
    292 		ifs = " \t\n";
    293 
    294 	setstackmark(&mk);
    295 	status = 0;
    296 	startword = 2;
    297 	STARTSTACKSTR(p);
    298 
    299 #ifdef SMALL
    300 	for ( ; ; ) {
    301 #else
    302 	for ( ; !n_flag || --maxlen >= 0 ; ) {
    303 #endif
    304 		if ((c = next_read_char(0, maxlen + 1)) < 0) {
    305 			status = 1;
    306 			break;
    307 		}
    308 		if (c == '\\' && c != end && !r_flag) {
    309 #ifndef SMALL
    310 			if (n_flag && --maxlen < 0)
    311 				break;
    312 #endif
    313 			if ((c = next_read_char(0, maxlen + 1)) < 0) {
    314 				status = 1;
    315 				break;
    316 			}
    317 			if (c != '\n')	/* \ \n is always just removed */
    318 				goto wdch;
    319 			if (read_tty)
    320 				out2str(getprompt(NULL));
    321 			continue;
    322 		}
    323 		if (c == end)
    324 			break;
    325 		if (c == '\0')
    326 			continue;
    327 		if (strchr(ifs, c))
    328 			is_ifs = strchr(" \t\n", c) ? 1 : 2;
    329 		else
    330 			is_ifs = 0;
    331 
    332 		if (startword != 0) {
    333 			if (is_ifs == 1) {
    334 				/* Ignore leading IFS whitespace */
    335 				if (saveall)
    336 					STPUTC(c, p);
    337 				continue;
    338 			}
    339 			if (is_ifs == 2 && startword == 1) {
    340 				/* Only one non-whitespace IFS per word */
    341 				startword = 2;
    342 				if (saveall)
    343 					STPUTC(c, p);
    344 				continue;
    345 			}
    346 		}
    347 
    348 		if (is_ifs == 0) {
    349   wdch:;
    350 			if (c == '\0') /* always ignore attempts to input \0 */
    351 				continue;
    352 			/* append this character to the current variable */
    353 			startword = 0;
    354 			if (saveall)
    355 				/* Not just a spare terminator */
    356 				saveall++;
    357 			STPUTC(c, p);
    358 			wordlen = p - stackblock();
    359 			continue;
    360 		}
    361 
    362 		/* end of variable... */
    363 		startword = is_ifs;
    364 
    365 		if (ap[1] == NULL) {
    366 			/* Last variable needs all IFS chars */
    367 			saveall++;
    368 			STPUTC(c, p);
    369 			continue;
    370 		}
    371 
    372 		if (equal(*ap, "IFS")) {
    373 			/*
    374 			 * we must not alter the value of IFS, as our
    375 			 * local "ifs" var is (perhaps) pointing at it,
    376 			 * at best we would be using data after free()
    377 			 * the next time we reference ifs - but that mem
    378 			 * may have been reused for something different.
    379 			 *
    380 			 * note that this might occur several times
    381 			 */
    382 			STPUTC('\0', p);
    383 			newifs = grabstackstr(p);
    384 		} else {
    385 			STACKSTRNUL(p);
    386 			setvar(*ap, stackblock(), 0);
    387 		}
    388 		ap++;
    389 		STARTSTACKSTR(p);
    390 		wordlen = 0;
    391 	}
    392 	STACKSTRNUL(p);
    393 
    394 #ifndef SMALL
    395 	(void)next_read_char(0, (size_t)-1);	/* attempt to seek back */
    396 	if (setraw)
    397 		setrawmode(0, 0, end, &ttystate);
    398 #endif
    399 
    400 
    401 	/* Remove trailing IFS chars */
    402 	for (; stackblock() + wordlen <= --p; *p = 0) {
    403 		if (!strchr(ifs, *p))
    404 			break;
    405 		if (strchr(" \t\n", *p))
    406 			/* Always remove whitespace */
    407 			continue;
    408 		if (saveall > 1)
    409 			/* Don't remove non-whitespace unless it was naked */
    410 			break;
    411 	}
    412 
    413 	/*
    414 	 * If IFS was one of the variables named, we can finally set it now
    415 	 * (no further references to ifs will be made)
    416 	 */
    417 	if (newifs != NULL)
    418 		setvar("IFS", newifs, 0);
    419 
    420 	/*
    421 	 * Now we can assign to the final variable (which might
    422 	 * also be IFS, hence the ordering here)
    423 	 */
    424 	setvar(*ap, stackblock(), 0);
    425 
    426 	/* Set any remaining args to "" */
    427 	while (*++ap != NULL)
    428 		setvar(*ap, nullstr, 0);
    429 
    430 	popstackmark(&mk);
    431 	return status;
    432 }
    433 
    434 
    435 
    436 int
    437 umaskcmd(int argc, char **argv)
    438 {
    439 	char *ap;
    440 	mode_t mask;
    441 	int i;
    442 	int symbolic_mode = 0;
    443 
    444 	while ((i = nextopt("S")) != '\0') {
    445 		symbolic_mode = 1;
    446 	}
    447 
    448 	INTOFF;
    449 	mask = umask(0);
    450 	umask(mask);
    451 	INTON;
    452 
    453 	if ((ap = *argptr) == NULL) {
    454 		if (symbolic_mode) {
    455 			char u[4], g[4], o[4];
    456 
    457 			i = 0;
    458 			if ((mask & S_IRUSR) == 0)
    459 				u[i++] = 'r';
    460 			if ((mask & S_IWUSR) == 0)
    461 				u[i++] = 'w';
    462 			if ((mask & S_IXUSR) == 0)
    463 				u[i++] = 'x';
    464 			u[i] = '\0';
    465 
    466 			i = 0;
    467 			if ((mask & S_IRGRP) == 0)
    468 				g[i++] = 'r';
    469 			if ((mask & S_IWGRP) == 0)
    470 				g[i++] = 'w';
    471 			if ((mask & S_IXGRP) == 0)
    472 				g[i++] = 'x';
    473 			g[i] = '\0';
    474 
    475 			i = 0;
    476 			if ((mask & S_IROTH) == 0)
    477 				o[i++] = 'r';
    478 			if ((mask & S_IWOTH) == 0)
    479 				o[i++] = 'w';
    480 			if ((mask & S_IXOTH) == 0)
    481 				o[i++] = 'x';
    482 			o[i] = '\0';
    483 
    484 			out1fmt("u=%s,g=%s,o=%s\n", u, g, o);
    485 		} else {
    486 			out1fmt("%.4o\n", mask);
    487 		}
    488 	} else {
    489 		if (is_digit(*ap)) {
    490 			int range = 0;
    491 
    492 			mask = 0;
    493 			do {
    494 				if (*ap >= '8' || *ap < '0')
    495 					error("Not a valid octal number: '%s'",
    496 					    *argptr);
    497 				mask = (mask << 3) + (*ap - '0');
    498 				if (mask & ~07777)
    499 					range = 1;
    500 			} while (*++ap != '\0');
    501 			if (range)
    502 			    error("Mask constant '%s' out of range", *argptr);
    503 			umask(mask);
    504 		} else {
    505 			void *set;
    506 
    507 			INTOFF;
    508 			if ((set = setmode(ap)) != 0) {
    509 				mask = getmode(set, ~mask & 0777);
    510 				ckfree(set);
    511 			}
    512 			INTON;
    513 			if (!set)
    514 				error("Cannot set mode `%s' (%s)", ap,
    515 				    strerror(errno));
    516 
    517 			umask(~mask & 0777);
    518 		}
    519 	}
    520 	flushout(out1);
    521 	if (io_err(out1)) {
    522 		out2str("umask: I/O error\n");
    523 		return 1;
    524 	}
    525 	return 0;
    526 }
    527 
    528 /*
    529  * ulimit builtin
    530  *
    531  * This code, originally by Doug Gwyn, Doug Kingston, Eric Gisin, and
    532  * Michael Rendell was ripped from pdksh 5.0.8 and hacked for use with
    533  * ash by J.T. Conklin.
    534  *
    535  * Public domain.
    536  */
    537 
    538 struct limits {
    539 	const char *name;
    540 	const char *unit;
    541 	char	option;
    542 	int8_t	cmd;		/* all RLIMIT_xxx are <= 127 */
    543 	unsigned short factor;	/* multiply by to get rlim_{cur,max} values */
    544 };
    545 
    546 #define	OPTSTRING_BASE "HSa"
    547 
    548 static const struct limits limits[] = {
    549 #ifdef RLIMIT_CPU
    550 	{ "time",	"seconds",	't',	RLIMIT_CPU,	   1 },
    551 #define	OPTSTRING_t	OPTSTRING_BASE "t"
    552 #else
    553 #define	OPTSTRING_t	OPTSTRING_BASE
    554 #endif
    555 #ifdef RLIMIT_FSIZE
    556 	{ "file",	"blocks",	'f',	RLIMIT_FSIZE,	 512 },
    557 #define	OPTSTRING_f	OPTSTRING_t "f"
    558 #else
    559 #define	OPTSTRING_f	OPTSTRING_t
    560 #endif
    561 #ifdef RLIMIT_DATA
    562 	{ "data",	"kbytes",	'd',	RLIMIT_DATA,	1024 },
    563 #define	OPTSTRING_d	OPTSTRING_f "d"
    564 #else
    565 #define	OPTSTRING_d	OPTSTRING_f
    566 #endif
    567 #ifdef RLIMIT_STACK
    568 	{ "stack",	"kbytes",	's',	RLIMIT_STACK,	1024 },
    569 #define	OPTSTRING_s	OPTSTRING_d "s"
    570 #else
    571 #define	OPTSTRING_s	OPTSTRING_d
    572 #endif
    573 #ifdef RLIMIT_CORE
    574 	{ "coredump",	"blocks",	'c',	RLIMIT_CORE,	 512 },
    575 #define	OPTSTRING_c	OPTSTRING_s "c"
    576 #else
    577 #define	OPTSTRING_c	OPTSTRING_s
    578 #endif
    579 #ifdef RLIMIT_RSS
    580 	{ "memory",	"kbytes",	'm',	RLIMIT_RSS,	1024 },
    581 #define	OPTSTRING_m	OPTSTRING_c "m"
    582 #else
    583 #define	OPTSTRING_m	OPTSTRING_c
    584 #endif
    585 #ifdef RLIMIT_MEMLOCK
    586 	{ "locked memory","kbytes",	'l',	RLIMIT_MEMLOCK, 1024 },
    587 #define	OPTSTRING_l	OPTSTRING_m "l"
    588 #else
    589 #define	OPTSTRING_l	OPTSTRING_m
    590 #endif
    591 #ifdef RLIMIT_NTHR
    592 	{ "thread",	"threads",	'r',	RLIMIT_NTHR,       1 },
    593 #define	OPTSTRING_r	OPTSTRING_l "r"
    594 #else
    595 #define	OPTSTRING_r	OPTSTRING_l
    596 #endif
    597 #ifdef RLIMIT_NPROC
    598 	{ "process",	"processes",	'p',	RLIMIT_NPROC,      1 },
    599 #define	OPTSTRING_p	OPTSTRING_r "p"
    600 #else
    601 #define	OPTSTRING_p	OPTSTRING_r
    602 #endif
    603 #ifdef RLIMIT_NOFILE
    604 	{ "nofiles",	"descriptors",	'n',	RLIMIT_NOFILE,     1 },
    605 #define	OPTSTRING_n	OPTSTRING_p "n"
    606 #else
    607 #define	OPTSTRING_n	OPTSTRING_p
    608 #endif
    609 #ifdef RLIMIT_VMEM
    610 	{ "vmemory",	"kbytes",	'v',	RLIMIT_VMEM,	1024 },
    611 #define	OPTSTRING_v	OPTSTRING_n "v"
    612 #else
    613 #define	OPTSTRING_v	OPTSTRING_n
    614 #endif
    615 #ifdef RLIMIT_SWAP
    616 	{ "swap",	"kbytes",	'w',	RLIMIT_SWAP,	1024 },
    617 #define	OPTSTRING_w	OPTSTRING_v "w"
    618 #else
    619 #define	OPTSTRING_w	OPTSTRING_v
    620 #endif
    621 #ifdef RLIMIT_SBSIZE
    622 	{ "sbsize",	"bytes",	'b',	RLIMIT_SBSIZE,	   1 },
    623 #define	OPTSTRING_b	OPTSTRING_w "b"
    624 #else
    625 #define	OPTSTRING_b	OPTSTRING_w
    626 #endif
    627 	{ NULL,		NULL,		'\0',	0,		   0 }
    628 };
    629 #define	OPTSTRING	OPTSTRING_b
    630 
    631 int
    632 ulimitcmd(int argc, char **argv)
    633 {
    634 	int	c;
    635 	rlim_t val = 0;
    636 	enum { SOFT = 0x1, HARD = 0x2 }
    637 			how = 0, which;
    638 	const struct limits	*l;
    639 	int		set, all = 0;
    640 	int		optc, what;
    641 	struct rlimit	limit;
    642 
    643 	what = 'f';
    644 	while ((optc = nextopt(OPTSTRING)) != '\0')
    645 		switch (optc) {
    646 		case 'H':
    647 			how |= HARD;
    648 			break;
    649 		case 'S':
    650 			how |= SOFT;
    651 			break;
    652 		case 'a':
    653 			all = 1;
    654 			break;
    655 		default:
    656 			what = optc;
    657 		}
    658 
    659 	for (l = limits; l->name && l->option != what; l++)
    660 		;
    661 	if (!l->name)
    662 		error("internal error (%c)", what);
    663 
    664 	set = *argptr ? 1 : 0;
    665 	if (set) {
    666 		char *p = *argptr;
    667 
    668 		if (all || argptr[1])
    669 			error("too many arguments");
    670 		if (how == 0)
    671 			how = HARD | SOFT;
    672 
    673 		if (strcmp(p, "unlimited") == 0)
    674 			val = RLIM_INFINITY;
    675 		else {
    676 			val = (rlim_t) 0;
    677 
    678 			while ((c = *p++) >= '0' && c <= '9') {
    679 				if (val >= RLIM_INFINITY/10)
    680 					error("%s: value overflow", *argptr);
    681 				val = (val * 10);
    682 				if (val >= RLIM_INFINITY - (long)(c - '0'))
    683 					error("%s: value overflow", *argptr);
    684 				val += (long)(c - '0');
    685 			}
    686 			if (c)
    687 				error("%s: bad number", *argptr);
    688 			if (val > RLIM_INFINITY / l->factor)
    689 				error("%s: value overflow", *argptr);
    690 			val *= l->factor;
    691 		}
    692 	} else if (how == 0)
    693 		how = SOFT;
    694 
    695 	if (all) {
    696 		for (l = limits; l->name; l++) {
    697 			getrlimit(l->cmd, &limit);
    698 			out1fmt("%-13s (-%c %-11s)    ", l->name, l->option,
    699 			    l->unit);
    700 
    701 			which = how;
    702 			while (which != 0) {
    703 				if (which & SOFT) {
    704 					val = limit.rlim_cur;
    705 					which &= ~SOFT;
    706 				} else if (which & HARD) {
    707 					val = limit.rlim_max;
    708 					which &= ~HARD;
    709 				}
    710 
    711 				if (val == RLIM_INFINITY)
    712 					out1fmt("unlimited");
    713 				else {
    714 					val /= l->factor;
    715 #ifdef BSD4_4
    716 					out1fmt("%9lld", (long long) val);
    717 #else
    718 					out1fmt("%9ld", (long) val);
    719 #endif
    720 				}
    721 				out1fmt("%c", which ? '\t' : '\n');
    722 			}
    723 		}
    724 		goto done;
    725 	}
    726 
    727 	if (getrlimit(l->cmd, &limit) == -1)
    728 		error("error getting limit (%s)", strerror(errno));
    729 	if (set) {
    730 		if (how & HARD)
    731 			limit.rlim_max = val;
    732 		if (how & SOFT)
    733 			limit.rlim_cur = val;
    734 		if (setrlimit(l->cmd, &limit) < 0)
    735 			error("error setting limit (%s)", strerror(errno));
    736 		if (l->cmd == RLIMIT_NOFILE)
    737 			user_fd_limit = sysconf(_SC_OPEN_MAX);
    738 	} else {
    739 		if (how & SOFT)
    740 			val = limit.rlim_cur;
    741 		else if (how & HARD)
    742 			val = limit.rlim_max;
    743 
    744 		if (val == RLIM_INFINITY)
    745 			out1fmt("unlimited\n");
    746 		else
    747 		{
    748 			val /= l->factor;
    749 #ifdef BSD4_4
    750 			out1fmt("%lld\n", (long long) val);
    751 #else
    752 			out1fmt("%ld\n", (long) val);
    753 #endif
    754 		}
    755 	}
    756   done:;
    757 	flushout(out1);
    758 	if (io_err(out1)) {
    759 		out2str("ulimit: I/O error (stdout)\n");
    760 		return 1;
    761 	}
    762 	return 0;
    763 }
    764