busybox/shell/shell_common.c

/* vi: set sw=4 ts=4: */
/*
 * Adapted from ash applet code
 *
 * This code is derived from software contributed to Berkeley by
 * Kenneth Almquist.
 *
 * Copyright (c) 1989, 1991, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
 * was re-ported from NetBSD and debianized.
 *
 * Copyright (c) 2010 Denys Vlasenko
 * Split from ash.c
 *
 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
 */
#include "libbb.h"
#include "shell_common.h"

const char defifsvar[] ALIGN1 = "IFS= \t\n";


int FAST_FUNC is_well_formed_var_name(const char *s, char terminator)
{
	if (!s || !(isalpha(*s) || *s == '_'))
		return 0;

	do
		s++;
	while (isalnum(*s) || *s == '_');

	return *s == terminator;
}

/* read builtin */

//TODO: use more efficient setvar() which takes a pointer to malloced "VAR=VAL"
//string. hush naturally has it, and ash has setvareq().
//Here we can simply store "VAR=" at buffer start and store read data directly
//after "=", then pass buffer to setvar() to consume.
const char* FAST_FUNC
shell_builtin_read(void FAST_FUNC (*setvar)(const char *name, const char *val),
	char       **argv,
	const char *ifs,
	int        read_flags,
	const char *opt_n,
	const char *opt_p,
	const char *opt_t,
	const char *opt_u
)
{
	unsigned end_ms; /* -t TIMEOUT */
	int fd; /* -u FD */
	int nchars; /* -n NUM */
	char **pp;
	char *buffer;
	struct termios tty, old_tty;
	const char *retval;
	int bufpos; /* need to be able to hold -1 */
	int startword;
	smallint backslash;

	pp = argv;
	while (*pp) {
		if (!is_well_formed_var_name(*pp, '\0')) {
			/* Mimic bash message */
			bb_error_msg("read: '%s': not a valid identifier", *pp);
			return (const char *)(uintptr_t)1;
		}
		pp++;
	}

	nchars = 0; /* if != 0, -n is in effect */
	if (opt_n) {
		nchars = bb_strtou(opt_n, NULL, 10);
		if (nchars < 0 || errno)
			return "invalid count";
		/* note: "-n 0": off (bash 3.2 does this too) */
	}
	end_ms = 0;
	if (opt_t) {
		end_ms = bb_strtou(opt_t, NULL, 10);
		if (errno || end_ms > UINT_MAX / 2048)
			return "invalid timeout";
		end_ms *= 1000;
#if 0 /* even bash has no -t N.NNN support */
		ts.tv_sec = bb_strtou(opt_t, &p, 10);
		ts.tv_usec = 0;
		/* EINVAL means number is ok, but not terminated by NUL */
		if (*p == '.' && errno == EINVAL) {
			char *p2;
			if (*++p) {
				int scale;
				ts.tv_usec = bb_strtou(p, &p2, 10);
				if (errno)
					return "invalid timeout";
				scale = p2 - p;
				/* normalize to usec */
				if (scale > 6)
					return "invalid timeout";
				while (scale++ < 6)
					ts.tv_usec *= 10;
			}
		} else if (ts.tv_sec < 0 || errno) {
			return "invalid timeout";
		}
		if (!(ts.tv_sec | ts.tv_usec)) { /* both are 0? */
			return "invalid timeout";
		}
#endif /* if 0 */
	}
	fd = STDIN_FILENO;
	if (opt_u) {
		fd = bb_strtou(opt_u, NULL, 10);
		if (fd < 0 || errno)
			return "invalid file descriptor";
	}

	if (opt_p && isatty(fd)) {
		fputs(opt_p, stderr);
		fflush_all();
	}

	if (ifs == NULL)
		ifs = defifs;

	if (nchars || (read_flags & BUILTIN_READ_SILENT)) {
		tcgetattr(fd, &tty);
		old_tty = tty;
		if (nchars) {
			tty.c_lflag &= ~ICANON;
			tty.c_cc[VMIN] = nchars < 256 ? nchars : 255;
		}
		if (read_flags & BUILTIN_READ_SILENT) {
			tty.c_lflag &= ~(ECHO | ECHOK | ECHONL);
		}
		/* This forces execution of "restoring" tcgetattr later */
		read_flags |= BUILTIN_READ_SILENT;
		/* if tcgetattr failed, tcsetattr will fail too.
		 * Ignoring, it's harmless. */
		tcsetattr(fd, TCSANOW, &tty);
	}

	retval = (const char *)(uintptr_t)0;
	startword = 1;
	backslash = 0;
	if (end_ms) /* NB: end_ms stays nonzero: */
		end_ms = ((unsigned)monotonic_ms() + end_ms) | 1;
	buffer = NULL;
	bufpos = 0;
	do {
		char c;

		if (end_ms) {
			int timeout;
			struct pollfd pfd[1];

			pfd[0].fd = fd;
			pfd[0].events = POLLIN;
			timeout = end_ms - (unsigned)monotonic_ms();
			if (timeout <= 0 /* already late? */
			 || safe_poll(pfd, 1, timeout) != 1 /* no? wait... */
			) { /* timed out! */
				retval = (const char *)(uintptr_t)1;
				goto ret;
			}
		}

		if ((bufpos & 0xff) == 0)
			buffer = xrealloc(buffer, bufpos + 0x100);
		if (nonblock_safe_read(fd, &buffer[bufpos], 1) != 1) {
			retval = (const char *)(uintptr_t)1;
			break;
		}
		c = buffer[bufpos];
		if (c == '\0')
			continue;
		if (backslash) {
			backslash = 0;
			if (c != '\n')
				goto put;
			continue;
		}
		if (!(read_flags & BUILTIN_READ_RAW) && c == '\\') {
			backslash = 1;
			continue;
		}
		if (c == '\n')
			break;

		/* $IFS splitting. NOT done if we run "read"
		 * without variable names (bash compat).
		 * Thus, "read" and "read REPLY" are not the same.
		 */
		if (argv[0]) {
/* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_05 */
			const char *is_ifs = strchr(ifs, c);
			if (startword && is_ifs) {
				if (isspace(c))
					continue;
				/* it is a non-space ifs char */
				startword--;
				if (startword == 1) /* first one? */
					continue; /* yes, it is not next word yet */
			}
			startword = 0;
			if (argv[1] != NULL && is_ifs) {
				buffer[bufpos] = '\0';
				bufpos = 0;
				setvar(*argv, buffer);
				argv++;
				/* can we skip one non-space ifs char? (2: yes) */
				startword = isspace(c) ? 2 : 1;
				continue;
			}
		}
 put:
		bufpos++;
	} while (--nchars);

	if (argv[0]) {
		/* Remove trailing space $IFS chars */
		while (--bufpos >= 0 && isspace(buffer[bufpos]) && strchr(ifs, buffer[bufpos]) != NULL)
			continue;
		buffer[bufpos + 1] = '\0';
		/* Use the remainder as a value for the next variable */
		setvar(*argv, buffer);
		/* Set the rest to "" */
		while (*++argv)
			setvar(*argv, "");
	} else {
		/* Note: no $IFS removal */
		buffer[bufpos] = '\0';
		setvar("REPLY", buffer);
	}

 ret:
	free(buffer);
	if (read_flags & BUILTIN_READ_SILENT)
		tcsetattr(fd, TCSANOW, &old_tty);
	return retval;
}

/* ulimit builtin */

struct limits {
	uint8_t cmd;            /* RLIMIT_xxx fit into it */
	uint8_t factor_shift;   /* shift by to get rlim_{cur,max} values */
	char option;
	const char *name;
};

static const struct limits limits_tbl[] = {
#ifdef RLIMIT_FSIZE
	{ RLIMIT_FSIZE,		9,	'f',	"file size (blocks)" },
#endif
#ifdef RLIMIT_CPU
	{ RLIMIT_CPU,		0,	't',	"cpu time (seconds)" },
#endif
#ifdef RLIMIT_DATA
	{ RLIMIT_DATA,		10,	'd',	"data seg size (kb)" },
#endif
#ifdef RLIMIT_STACK
	{ RLIMIT_STACK,		10,	's',	"stack size (kb)" },
#endif
#ifdef RLIMIT_CORE
	{ RLIMIT_CORE,		9,	'c',	"core file size (blocks)" },
#endif
#ifdef RLIMIT_RSS
	{ RLIMIT_RSS,		10,	'm',	"resident set size (kb)" },
#endif
#ifdef RLIMIT_MEMLOCK
	{ RLIMIT_MEMLOCK,	10,	'l',	"locked memory (kb)" },
#endif
#ifdef RLIMIT_NPROC
	{ RLIMIT_NPROC,		0,	'p',	"processes" },
#endif
#ifdef RLIMIT_NOFILE
	{ RLIMIT_NOFILE,	0,	'n',	"file descriptors" },
#endif
#ifdef RLIMIT_AS
	{ RLIMIT_AS,		10,	'v',	"address space (kb)" },
#endif
#ifdef RLIMIT_LOCKS
	{ RLIMIT_LOCKS,		0,	'w',	"locks" },
#endif
};

enum {
	OPT_hard = (1 << 0),
	OPT_soft = (1 << 1),
};

/* "-": treat args as parameters of option with ASCII code 1 */
static const char ulimit_opt_string[] = "-HSa"
#ifdef RLIMIT_FSIZE
			"f::"
#endif
#ifdef RLIMIT_CPU
			"t::"
#endif
#ifdef RLIMIT_DATA
			"d::"
#endif
#ifdef RLIMIT_STACK
			"s::"
#endif
#ifdef RLIMIT_CORE
			"c::"
#endif
#ifdef RLIMIT_RSS
			"m::"
#endif
#ifdef RLIMIT_MEMLOCK
			"l::"
#endif
#ifdef RLIMIT_NPROC
			"p::"
#endif
#ifdef RLIMIT_NOFILE
			"n::"
#endif
#ifdef RLIMIT_AS
			"v::"
#endif
#ifdef RLIMIT_LOCKS
			"w::"
#endif
			;

static void printlim(unsigned opts, const struct rlimit *limit,
			const struct limits *l)
{
	rlim_t val;

	val = limit->rlim_max;
	if (!(opts & OPT_hard))
		val = limit->rlim_cur;

	if (val == RLIM_INFINITY)
		printf("unlimited\n");
	else {
		val >>= l->factor_shift;
		printf("%llu\n", (long long) val);
	}
}

int FAST_FUNC
shell_builtin_ulimit(char **argv)
{
	unsigned opts;
	unsigned argc;

	/* We can't use getopt32: need to handle commands like
	 * ulimit 123 -c2 -l 456
	 */

	/* In case getopt was already called:
	 * reset the libc getopt() function, which keeps internal state.
	 */
#ifdef __GLIBC__
	optind = 0;
#else /* BSD style */
	optind = 1;
	/* optreset = 1; */
#endif
	/* optarg = NULL; opterr = 0; optopt = 0; - do we need this?? */

        argc = 1;
        while (argv[argc])
                argc++;

	opts = 0;
	while (1) {
		struct rlimit limit;
		const struct limits *l;
		int opt_char = getopt(argc, argv, ulimit_opt_string);

		if (opt_char == -1)
			break;
		if (opt_char == 'H') {
			opts |= OPT_hard;
			continue;
		}
		if (opt_char == 'S') {
			opts |= OPT_soft;
			continue;
		}

		if (opt_char == 'a') {
			for (l = limits_tbl; l != &limits_tbl[ARRAY_SIZE(limits_tbl)]; l++) {
				getrlimit(l->cmd, &limit);
				printf("-%c: %-30s ", l->option, l->name);
				printlim(opts, &limit, l);
			}
			continue;
		}

		if (opt_char == 1)
			opt_char = 'f';
		for (l = limits_tbl; l != &limits_tbl[ARRAY_SIZE(limits_tbl)]; l++) {
			if (opt_char == l->option) {
				char *val_str;

				getrlimit(l->cmd, &limit);

				val_str = optarg;
				if (!val_str && argv[optind] && argv[optind][0] != '-')
					val_str = argv[optind++]; /* ++ skips NN in "-c NN" case */
				if (val_str) {
					rlim_t val;

					if (strcmp(val_str, "unlimited") == 0)
						val = RLIM_INFINITY;
					else {
						if (sizeof(val) == sizeof(int))
							val = bb_strtou(val_str, NULL, 10);
						else if (sizeof(val) == sizeof(long))
							val = bb_strtoul(val_str, NULL, 10);
						else
							val = bb_strtoull(val_str, NULL, 10);
						if (errno) {
							bb_error_msg("bad number");
							return EXIT_FAILURE;
						}
						val <<= l->factor_shift;
					}
//bb_error_msg("opt %c val_str:'%s' val:%lld", opt_char, val_str, (long long)val);
					/* from man bash: "If neither -H nor -S
					 * is specified, both the soft and hard
					 * limits are set. */
					if (!opts)
						opts = OPT_hard + OPT_soft;
					if (opts & OPT_hard)
						limit.rlim_max = val;
					if (opts & OPT_soft)
						limit.rlim_cur = val;
//bb_error_msg("setrlimit(%d, %lld, %lld)", l->cmd, (long long)limit.rlim_cur, (long long)limit.rlim_max);
					if (setrlimit(l->cmd, &limit) < 0) {
						bb_perror_msg("error setting limit");
						return EXIT_FAILURE;
					}
				} else {
					printlim(opts, &limit, l);
				}
				break;
			}
		} /* for (every possible opt) */

		if (l == &limits_tbl[ARRAY_SIZE(limits_tbl)]) {
			/* bad option. getopt already complained. */
			break;
		}

	} /* while (there are options) */

	return 0;
}
1	/* vi: set sw=4 ts=4: */
2	/*
3	* Adapted from ash applet code
4	*
5	* This code is derived from software contributed to Berkeley by
6	* Kenneth Almquist.
7	*
8	* Copyright (c) 1989, 1991, 1993, 1994
9	* The Regents of the University of California. All rights reserved.
10	*
11	* Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
12	* was re-ported from NetBSD and debianized.
13	*
14	* Copyright (c) 2010 Denys Vlasenko
15	* Split from ash.c
16	*
17	* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
18	*/
19	#include "libbb.h"
20	#include "shell_common.h"
21
22	const char defifsvar[] ALIGN1 = "IFS= \t\n";
23
24
25	int FAST_FUNC is_well_formed_var_name(const char *s, char terminator)
26	{
27	if (!s \|\| !(isalpha(s) \|\| s == '_'))
28	return 0;
29
30	do
31	s++;
32	while (isalnum(s) \|\| s == '_');
33
34	return *s == terminator;
35	}
36
37	/* read builtin */
38
39	//TODO: use more efficient setvar() which takes a pointer to malloced "VAR=VAL"
40	//string. hush naturally has it, and ash has setvareq().
41	//Here we can simply store "VAR=" at buffer start and store read data directly
42	//after "=", then pass buffer to setvar() to consume.
43	const char* FAST_FUNC
44	shell_builtin_read(void FAST_FUNC (setvar)(const char name, const char *val),
45	char **argv,
46	const char *ifs,
47	int read_flags,
48	const char *opt_n,
49	const char *opt_p,
50	const char *opt_t,
51	const char *opt_u
52	)
53	{
54	unsigned end_ms; /* -t TIMEOUT */
55	int fd; /* -u FD */
56	int nchars; /* -n NUM */
57	char **pp;
58	char *buffer;
59	struct termios tty, old_tty;
60	const char *retval;
61	int bufpos; /* need to be able to hold -1 */
62	int startword;
63	smallint backslash;
64
65	pp = argv;
66	while (*pp) {
67	if (!is_well_formed_var_name(*pp, '\0')) {
68	/* Mimic bash message */
69	bb_error_msg("read: '%s': not a valid identifier", *pp);
70	return (const char *)(uintptr_t)1;
71	}
72	pp++;
73	}
74
75	nchars = 0; /* if != 0, -n is in effect */
76	if (opt_n) {
77	nchars = bb_strtou(opt_n, NULL, 10);
78	if (nchars < 0 \|\| errno)
79	return "invalid count";
80	/* note: "-n 0": off (bash 3.2 does this too) */
81	}
82	end_ms = 0;
83	if (opt_t) {
84	end_ms = bb_strtou(opt_t, NULL, 10);
85	if (errno \|\| end_ms > UINT_MAX / 2048)
86	return "invalid timeout";
87	end_ms *= 1000;
88	#if 0 /* even bash has no -t N.NNN support */
89	ts.tv_sec = bb_strtou(opt_t, &p, 10);
90	ts.tv_usec = 0;
91	/* EINVAL means number is ok, but not terminated by NUL */
92	if (*p == '.' && errno == EINVAL) {
93	char *p2;
94	if (*++p) {
95	int scale;
96	ts.tv_usec = bb_strtou(p, &p2, 10);
97	if (errno)
98	return "invalid timeout";
99	scale = p2 - p;
100	/* normalize to usec */
101	if (scale > 6)
102	return "invalid timeout";
103	while (scale++ < 6)
104	ts.tv_usec *= 10;
105	}
106	} else if (ts.tv_sec < 0 \|\| errno) {
107	return "invalid timeout";
108	}
109	if (!(ts.tv_sec \| ts.tv_usec)) { /* both are 0? */
110	return "invalid timeout";
111	}
112	#endif /* if 0 */
113	}
114	fd = STDIN_FILENO;
115	if (opt_u) {
116	fd = bb_strtou(opt_u, NULL, 10);
117	if (fd < 0 \|\| errno)
118	return "invalid file descriptor";
119	}
120
121	if (opt_p && isatty(fd)) {
122	fputs(opt_p, stderr);
123	fflush_all();
124	}
125
126	if (ifs == NULL)
127	ifs = defifs;
128
129	if (nchars \|\| (read_flags & BUILTIN_READ_SILENT)) {
130	tcgetattr(fd, &tty);
131	old_tty = tty;
132	if (nchars) {
133	tty.c_lflag &= ~ICANON;
134	tty.c_cc[VMIN] = nchars < 256 ? nchars : 255;
135	}
136	if (read_flags & BUILTIN_READ_SILENT) {
137	tty.c_lflag &= ~(ECHO \| ECHOK \| ECHONL);
138	}
139	/* This forces execution of "restoring" tcgetattr later */
140	read_flags \|= BUILTIN_READ_SILENT;
141	/* if tcgetattr failed, tcsetattr will fail too.
142	* Ignoring, it's harmless. */
143	tcsetattr(fd, TCSANOW, &tty);
144	}
145
146	retval = (const char *)(uintptr_t)0;
147	startword = 1;
148	backslash = 0;
149	if (end_ms) /* NB: end_ms stays nonzero: */
150	end_ms = ((unsigned)monotonic_ms() + end_ms) \| 1;
151	buffer = NULL;
152	bufpos = 0;
153	do {
154	char c;
155
156	if (end_ms) {
157	int timeout;
158	struct pollfd pfd[1];
159
160	pfd[0].fd = fd;
161	pfd[0].events = POLLIN;
162	timeout = end_ms - (unsigned)monotonic_ms();
163	if (timeout <= 0 /* already late? */
164	\|\| safe_poll(pfd, 1, timeout) != 1 /* no? wait... */
165	) { /* timed out! */
166	retval = (const char *)(uintptr_t)1;
167	goto ret;
168	}
169	}
170
171	if ((bufpos & 0xff) == 0)
172	buffer = xrealloc(buffer, bufpos + 0x100);
173	if (nonblock_safe_read(fd, &buffer[bufpos], 1) != 1) {
174	retval = (const char *)(uintptr_t)1;
175	break;
176	}
177	c = buffer[bufpos];
178	if (c == '\0')
179	continue;
180	if (backslash) {
181	backslash = 0;
182	if (c != '\n')
183	goto put;
184	continue;
185	}
186	if (!(read_flags & BUILTIN_READ_RAW) && c == '\\') {
187	backslash = 1;
188	continue;
189	}
190	if (c == '\n')
191	break;
192
193	/* $IFS splitting. NOT done if we run "read"
194	* without variable names (bash compat).
195	* Thus, "read" and "read REPLY" are not the same.
196	*/
197	if (argv[0]) {
198	/* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_05 */
199	const char *is_ifs = strchr(ifs, c);
200	if (startword && is_ifs) {
201	if (isspace(c))
202	continue;
203	/* it is a non-space ifs char */
204	startword--;
205	if (startword == 1) /* first one? */
206	continue; /* yes, it is not next word yet */
207	}
208	startword = 0;
209	if (argv[1] != NULL && is_ifs) {
210	buffer[bufpos] = '\0';
211	bufpos = 0;
212	setvar(*argv, buffer);
213	argv++;
214	/* can we skip one non-space ifs char? (2: yes) */
215	startword = isspace(c) ? 2 : 1;
216	continue;
217	}
218	}
219	put:
220	bufpos++;
221	} while (--nchars);
222
223	if (argv[0]) {
224	/* Remove trailing space $IFS chars */
225	while (--bufpos >= 0 && isspace(buffer[bufpos]) && strchr(ifs, buffer[bufpos]) != NULL)
226	continue;
227	buffer[bufpos + 1] = '\0';
228	/* Use the remainder as a value for the next variable */
229	setvar(*argv, buffer);
230	/* Set the rest to "" */
231	while (*++argv)
232	setvar(*argv, "");
233	} else {
234	/* Note: no $IFS removal */
235	buffer[bufpos] = '\0';
236	setvar("REPLY", buffer);
237	}
238
239	ret:
240	free(buffer);
241	if (read_flags & BUILTIN_READ_SILENT)
242	tcsetattr(fd, TCSANOW, &old_tty);
243	return retval;
244	}
245
246	/* ulimit builtin */
247
248	struct limits {
249	uint8_t cmd; /* RLIMIT_xxx fit into it */
250	uint8_t factor_shift; /* shift by to get rlim_{cur,max} values */
251	char option;
252	const char *name;
253	};
254
255	static const struct limits limits_tbl[] = {
256	#ifdef RLIMIT_FSIZE
257	{ RLIMIT_FSIZE, 9, 'f', "file size (blocks)" },
258	#endif
259	#ifdef RLIMIT_CPU
260	{ RLIMIT_CPU, 0, 't', "cpu time (seconds)" },
261	#endif
262	#ifdef RLIMIT_DATA
263	{ RLIMIT_DATA, 10, 'd', "data seg size (kb)" },
264	#endif
265	#ifdef RLIMIT_STACK
266	{ RLIMIT_STACK, 10, 's', "stack size (kb)" },
267	#endif
268	#ifdef RLIMIT_CORE
269	{ RLIMIT_CORE, 9, 'c', "core file size (blocks)" },
270	#endif
271	#ifdef RLIMIT_RSS
272	{ RLIMIT_RSS, 10, 'm', "resident set size (kb)" },
273	#endif
274	#ifdef RLIMIT_MEMLOCK
275	{ RLIMIT_MEMLOCK, 10, 'l', "locked memory (kb)" },
276	#endif
277	#ifdef RLIMIT_NPROC
278	{ RLIMIT_NPROC, 0, 'p', "processes" },
279	#endif
280	#ifdef RLIMIT_NOFILE
281	{ RLIMIT_NOFILE, 0, 'n', "file descriptors" },
282	#endif
283	#ifdef RLIMIT_AS
284	{ RLIMIT_AS, 10, 'v', "address space (kb)" },
285	#endif
286	#ifdef RLIMIT_LOCKS
287	{ RLIMIT_LOCKS, 0, 'w', "locks" },
288	#endif
289	};
290
291	enum {
292	OPT_hard = (1 << 0),
293	OPT_soft = (1 << 1),
294	};
295
296	/* "-": treat args as parameters of option with ASCII code 1 */
297	static const char ulimit_opt_string[] = "-HSa"
298	#ifdef RLIMIT_FSIZE
299	"f::"
300	#endif
301	#ifdef RLIMIT_CPU
302	"t::"
303	#endif
304	#ifdef RLIMIT_DATA
305	"d::"
306	#endif
307	#ifdef RLIMIT_STACK
308	"s::"
309	#endif
310	#ifdef RLIMIT_CORE
311	"c::"
312	#endif
313	#ifdef RLIMIT_RSS
314	"m::"
315	#endif
316	#ifdef RLIMIT_MEMLOCK
317	"l::"
318	#endif
319	#ifdef RLIMIT_NPROC
320	"p::"
321	#endif
322	#ifdef RLIMIT_NOFILE
323	"n::"
324	#endif
325	#ifdef RLIMIT_AS
326	"v::"
327	#endif
328	#ifdef RLIMIT_LOCKS
329	"w::"
330	#endif
331	;
332
333	static void printlim(unsigned opts, const struct rlimit *limit,
334	const struct limits *l)
335	{
336	rlim_t val;
337
338	val = limit->rlim_max;
339	if (!(opts & OPT_hard))
340	val = limit->rlim_cur;
341
342	if (val == RLIM_INFINITY)
343	printf("unlimited\n");
344	else {
345	val >>= l->factor_shift;
346	printf("%llu\n", (long long) val);
347	}
348	}
349
350	int FAST_FUNC
351	shell_builtin_ulimit(char **argv)
352	{
353	unsigned opts;
354	unsigned argc;
355
356	/* We can't use getopt32: need to handle commands like
357	* ulimit 123 -c2 -l 456
358	*/
359
360	/* In case getopt was already called:
361	* reset the libc getopt() function, which keeps internal state.
362	*/
363	#ifdef __GLIBC__
364	optind = 0;
365	#else /* BSD style */
366	optind = 1;
367	/* optreset = 1; */
368	#endif
369	/* optarg = NULL; opterr = 0; optopt = 0; - do we need this?? */
370
371	argc = 1;
372	while (argv[argc])
373	argc++;
374
375	opts = 0;
376	while (1) {
377	struct rlimit limit;
378	const struct limits *l;
379	int opt_char = getopt(argc, argv, ulimit_opt_string);
380
381	if (opt_char == -1)
382	break;
383	if (opt_char == 'H') {
384	opts \|= OPT_hard;
385	continue;
386	}
387	if (opt_char == 'S') {
388	opts \|= OPT_soft;
389	continue;
390	}
391
392	if (opt_char == 'a') {
393	for (l = limits_tbl; l != &limits_tbl[ARRAY_SIZE(limits_tbl)]; l++) {
394	getrlimit(l->cmd, &limit);
395	printf("-%c: %-30s ", l->option, l->name);
396	printlim(opts, &limit, l);
397	}
398	continue;
399	}
400
401	if (opt_char == 1)
402	opt_char = 'f';
403	for (l = limits_tbl; l != &limits_tbl[ARRAY_SIZE(limits_tbl)]; l++) {
404	if (opt_char == l->option) {
405	char *val_str;
406
407	getrlimit(l->cmd, &limit);
408
409	val_str = optarg;
410	if (!val_str && argv[optind] && argv[optind][0] != '-')
411	val_str = argv[optind++]; /* ++ skips NN in "-c NN" case */
412	if (val_str) {
413	rlim_t val;
414
415	if (strcmp(val_str, "unlimited") == 0)
416	val = RLIM_INFINITY;
417	else {
418	if (sizeof(val) == sizeof(int))
419	val = bb_strtou(val_str, NULL, 10);
420	else if (sizeof(val) == sizeof(long))
421	val = bb_strtoul(val_str, NULL, 10);
422	else
423	val = bb_strtoull(val_str, NULL, 10);
424	if (errno) {
425	bb_error_msg("bad number");
426	return EXIT_FAILURE;
427	}
428	val <<= l->factor_shift;
429	}
430	//bb_error_msg("opt %c val_str:'%s' val:%lld", opt_char, val_str, (long long)val);
431	/* from man bash: "If neither -H nor -S
432	* is specified, both the soft and hard
433	* limits are set. */
434	if (!opts)
435	opts = OPT_hard + OPT_soft;
436	if (opts & OPT_hard)
437	limit.rlim_max = val;
438	if (opts & OPT_soft)
439	limit.rlim_cur = val;
440	//bb_error_msg("setrlimit(%d, %lld, %lld)", l->cmd, (long long)limit.rlim_cur, (long long)limit.rlim_max);
441	if (setrlimit(l->cmd, &limit) < 0) {
442	bb_perror_msg("error setting limit");
443	return EXIT_FAILURE;
444	}
445	} else {
446	printlim(opts, &limit, l);
447	}
448	break;
449	}
450	} /* for (every possible opt) */
451
452	if (l == &limits_tbl[ARRAY_SIZE(limits_tbl)]) {
453	/* bad option. getopt already complained. */
454	break;
455	}
456
457	} /* while (there are options) */
458
459	return 0;
460	}