1/*
2 * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
3 * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
4 * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
5 * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
6 * All rights reserved.
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 * 3. The name of the author may not be used to endorse or promote products
17 *    derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include "defs.h"
32
33SYS_FUNC(close)
34{
35	printfd(tcp, tcp->u_arg[0]);
36
37	return RVAL_DECODED;
38}
39
40SYS_FUNC(dup)
41{
42	printfd(tcp, tcp->u_arg[0]);
43
44	return RVAL_DECODED | RVAL_FD;
45}
46
47static int
48do_dup2(struct tcb *tcp, int flags_arg)
49{
50	printfd(tcp, tcp->u_arg[0]);
51	tprints(", ");
52	printfd(tcp, tcp->u_arg[1]);
53	if (flags_arg >= 0) {
54		tprints(", ");
55		printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
56	}
57
58	return RVAL_DECODED | RVAL_FD;
59}
60
61SYS_FUNC(dup2)
62{
63	return do_dup2(tcp, -1);
64}
65
66SYS_FUNC(dup3)
67{
68	return do_dup2(tcp, 2);
69}
70
71#if defined(ALPHA)
72SYS_FUNC(getdtablesize)
73{
74	return 0;
75}
76#endif
77
78static int
79decode_select(struct tcb *tcp, long *args,
80	      void (*print_tv_ts) (struct tcb *, const long),
81	      const char * (*sprint_tv_ts) (struct tcb *, const long))
82{
83	int i, j;
84	int nfds, fdsize;
85	fd_set *fds = NULL;
86	const char *sep;
87	long arg;
88
89	/* Kernel truncates arg[0] to int, we do the same. */
90	nfds = (int) args[0];
91
92	/* Kernel rejects negative nfds, so we don't parse it either. */
93	if (nfds < 0)
94		nfds = 0;
95
96	/* Beware of select(2^31-1, NULL, NULL, NULL) and similar... */
97	if (nfds > 1024*1024)
98		nfds = 1024*1024;
99
100	/*
101	 * We had bugs a-la "while (j < args[0])" and "umoven(args[0])" below.
102	 * Instead of args[0], use nfds for fd count, fdsize for array lengths.
103	 */
104	fdsize = (((nfds + 7) / 8) + current_wordsize-1) & -current_wordsize;
105
106	if (entering(tcp)) {
107		tprintf("%d", (int) args[0]);
108
109		if (verbose(tcp) && fdsize > 0)
110			fds = malloc(fdsize);
111		for (i = 0; i < 3; i++) {
112			arg = args[i+1];
113			tprints(", ");
114			if (!fds) {
115				printaddr(arg);
116				continue;
117			}
118			if (umoven_or_printaddr(tcp, arg, fdsize, fds))
119				continue;
120			tprints("[");
121			for (j = 0, sep = "";; j++) {
122				j = next_set_bit(fds, j, nfds);
123				if (j < 0)
124					break;
125				tprints(sep);
126				printfd(tcp, j);
127				sep = " ";
128			}
129			tprints("]");
130		}
131		free(fds);
132		tprints(", ");
133		print_tv_ts(tcp, args[4]);
134	} else {
135		static char outstr[1024];
136		char *outptr;
137#define end_outstr (outstr + sizeof(outstr))
138		int ready_fds;
139
140		if (syserror(tcp))
141			return 0;
142
143		ready_fds = tcp->u_rval;
144		if (ready_fds == 0) {
145			tcp->auxstr = "Timeout";
146			return RVAL_STR;
147		}
148
149		fds = malloc(fdsize);
150
151		outptr = outstr;
152		sep = "";
153		for (i = 0; i < 3 && ready_fds > 0; i++) {
154			int first = 1;
155
156			arg = args[i+1];
157			if (!arg || !fds || umoven(tcp, arg, fdsize, fds) < 0)
158				continue;
159			for (j = 0;; j++) {
160				j = next_set_bit(fds, j, nfds);
161				if (j < 0)
162					break;
163				/* +2 chars needed at the end: ']',NUL */
164				if (outptr < end_outstr - (sizeof(", except [") + sizeof(int)*3 + 2)) {
165					if (first) {
166						outptr += sprintf(outptr, "%s%s [%u",
167							sep,
168							i == 0 ? "in" : i == 1 ? "out" : "except",
169							j
170						);
171						first = 0;
172						sep = ", ";
173					}
174					else {
175						outptr += sprintf(outptr, " %u", j);
176					}
177				}
178				if (--ready_fds == 0)
179					break;
180			}
181			if (outptr != outstr)
182				*outptr++ = ']';
183		}
184		free(fds);
185		/* This contains no useful information on SunOS.  */
186		if (args[4]) {
187			const char *str = sprint_tv_ts(tcp, args[4]);
188			if (outptr + sizeof("left ") + strlen(sep) + strlen(str) < end_outstr) {
189				outptr += sprintf(outptr, "%sleft %s", sep, str);
190			}
191		}
192		*outptr = '\0';
193		tcp->auxstr = outstr;
194		return RVAL_STR;
195#undef end_outstr
196	}
197	return 0;
198}
199
200SYS_FUNC(oldselect)
201{
202	long long_args[5];
203#undef oldselect_args
204#if SIZEOF_LONG == 4
205# define oldselect_args long_args
206#else
207	unsigned int oldselect_args[5];
208	unsigned int i;
209#endif
210
211	if (umove(tcp, tcp->u_arg[0], &oldselect_args) < 0) {
212		printaddr(tcp->u_arg[0]);
213		return 0;
214	}
215#ifndef oldselect_args
216	for (i = 0; i < 5; i++) {
217		long_args[i] = oldselect_args[i];
218	}
219#endif
220	return decode_select(tcp, long_args, print_timeval, sprint_timeval);
221#undef oldselect_args
222}
223
224#ifdef ALPHA
225SYS_FUNC(osf_select)
226{
227	return decode_select(tcp, tcp->u_arg, print_timeval32, sprint_timeval32);
228}
229#endif
230
231SYS_FUNC(select)
232{
233	return decode_select(tcp, tcp->u_arg, print_timeval, sprint_timeval);
234}
235
236#include "kernel_types.h"
237
238static int
239umove_kulong_array_or_printaddr(struct tcb *tcp, const long addr,
240				kernel_ulong_t *ptr, size_t n)
241{
242#if defined X86_64 || defined X32
243	if (current_personality == 1) {
244#else
245	if (current_wordsize < sizeof(*ptr)) {
246#endif
247		uint32_t ptr32[n];
248		int r = umove_or_printaddr(tcp, addr, &ptr32);
249		if (!r) {
250			size_t i;
251
252			for (i = 0; i < n; ++i)
253				ptr[i] = (kernel_ulong_t) ptr32[i];
254		}
255		return r;
256	}
257	return umoven_or_printaddr(tcp, addr, n * sizeof(*ptr), ptr);
258}
259
260SYS_FUNC(pselect6)
261{
262	int rc = decode_select(tcp, tcp->u_arg, print_timespec, sprint_timespec);
263	if (entering(tcp)) {
264		kernel_ulong_t data[2];
265
266		tprints(", ");
267		if (!umove_kulong_array_or_printaddr(tcp, tcp->u_arg[5],
268						     data, ARRAY_SIZE(data))) {
269			tprints("{");
270			/* NB: kernel requires data[1] == NSIG / 8 */
271			print_sigset_addr_len(tcp, (unsigned long) data[0],
272					      (unsigned long) data[1]);
273			tprintf(", %llu}", (unsigned long long) data[1]);
274		}
275	}
276
277	return rc;
278}
279