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
SYS_FUNC(close)33 SYS_FUNC(close)
34 {
35 printfd(tcp, tcp->u_arg[0]);
36
37 return RVAL_DECODED;
38 }
39
SYS_FUNC(dup)40 SYS_FUNC(dup)
41 {
42 printfd(tcp, tcp->u_arg[0]);
43
44 return RVAL_DECODED | RVAL_FD;
45 }
46
47 static int
do_dup2(struct tcb * tcp,int flags_arg)48 do_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
SYS_FUNC(dup2)61 SYS_FUNC(dup2)
62 {
63 return do_dup2(tcp, -1);
64 }
65
SYS_FUNC(dup3)66 SYS_FUNC(dup3)
67 {
68 return do_dup2(tcp, 2);
69 }
70
71 static int
decode_select(struct tcb * const tcp,const kernel_ulong_t * const args,void (* const print_tv_ts)(struct tcb *,kernel_ulong_t),const char * (* const sprint_tv_ts)(struct tcb *,kernel_ulong_t))72 decode_select(struct tcb *const tcp, const kernel_ulong_t *const args,
73 void (*const print_tv_ts) (struct tcb *, kernel_ulong_t),
74 const char * (*const sprint_tv_ts) (struct tcb *, kernel_ulong_t))
75 {
76 int i, j;
77 int nfds, fdsize;
78 fd_set *fds = NULL;
79 const char *sep;
80 kernel_ulong_t addr;
81
82 /* Kernel truncates args[0] to int, we do the same. */
83 nfds = (int) args[0];
84
85 /* Kernel rejects negative nfds, so we don't parse it either. */
86 if (nfds < 0)
87 nfds = 0;
88
89 /* Beware of select(2^31-1, NULL, NULL, NULL) and similar... */
90 if (nfds > 1024*1024)
91 nfds = 1024*1024;
92
93 /*
94 * We had bugs a-la "while (j < args[0])" and "umoven(args[0])" below.
95 * Instead of args[0], use nfds for fd count, fdsize for array lengths.
96 */
97 fdsize = (((nfds + 7) / 8) + current_wordsize-1) & -current_wordsize;
98
99 if (entering(tcp)) {
100 tprintf("%d", (int) args[0]);
101
102 if (verbose(tcp) && fdsize > 0)
103 fds = malloc(fdsize);
104 for (i = 0; i < 3; i++) {
105 addr = args[i+1];
106 tprints(", ");
107 if (!fds) {
108 printaddr(addr);
109 continue;
110 }
111 if (umoven_or_printaddr(tcp, addr, fdsize, fds))
112 continue;
113 tprints("[");
114 for (j = 0, sep = "";; j++) {
115 j = next_set_bit(fds, j, nfds);
116 if (j < 0)
117 break;
118 tprints(sep);
119 printfd(tcp, j);
120 sep = " ";
121 }
122 tprints("]");
123 }
124 free(fds);
125 tprints(", ");
126 print_tv_ts(tcp, args[4]);
127 } else {
128 static char outstr[1024];
129 char *outptr;
130 #define end_outstr (outstr + sizeof(outstr))
131 int ready_fds;
132
133 if (syserror(tcp))
134 return 0;
135
136 ready_fds = tcp->u_rval;
137 if (ready_fds == 0) {
138 tcp->auxstr = "Timeout";
139 return RVAL_STR;
140 }
141
142 fds = malloc(fdsize);
143
144 outptr = outstr;
145 sep = "";
146 for (i = 0; i < 3 && ready_fds > 0; i++) {
147 int first = 1;
148
149 addr = args[i+1];
150 if (!addr || !fds || umoven(tcp, addr, fdsize, fds) < 0)
151 continue;
152 for (j = 0;; j++) {
153 j = next_set_bit(fds, j, nfds);
154 if (j < 0)
155 break;
156 /* +2 chars needed at the end: ']',NUL */
157 if (outptr < end_outstr - (sizeof(", except [") + sizeof(int)*3 + 2)) {
158 if (first) {
159 outptr += sprintf(outptr, "%s%s [%u",
160 sep,
161 i == 0 ? "in" : i == 1 ? "out" : "except",
162 j
163 );
164 first = 0;
165 sep = ", ";
166 }
167 else {
168 outptr += sprintf(outptr, " %u", j);
169 }
170 }
171 if (--ready_fds == 0)
172 break;
173 }
174 if (outptr != outstr)
175 *outptr++ = ']';
176 }
177 free(fds);
178 /* This contains no useful information on SunOS. */
179 if (args[4]) {
180 const char *str = sprint_tv_ts(tcp, args[4]);
181 if (outptr + sizeof("left ") + strlen(sep) + strlen(str) < end_outstr) {
182 outptr += sprintf(outptr, "%sleft %s", sep, str);
183 }
184 }
185 *outptr = '\0';
186 tcp->auxstr = outstr;
187 return RVAL_STR;
188 #undef end_outstr
189 }
190 return 0;
191 }
192
SYS_FUNC(oldselect)193 SYS_FUNC(oldselect)
194 {
195 kernel_ulong_t select_args[5];
196 unsigned int oldselect_args[5];
197
198 if (sizeof(*select_args) == sizeof(*oldselect_args)) {
199 if (umove_or_printaddr(tcp, tcp->u_arg[0], &select_args)) {
200 return 0;
201 }
202 } else {
203 unsigned int i;
204
205 if (umove_or_printaddr(tcp, tcp->u_arg[0], &oldselect_args)) {
206 return 0;
207 }
208
209 for (i = 0; i < 5; ++i) {
210 select_args[i] = oldselect_args[i];
211 }
212 }
213
214 return decode_select(tcp, select_args, print_timeval, sprint_timeval);
215 }
216
217 #ifdef ALPHA
SYS_FUNC(osf_select)218 SYS_FUNC(osf_select)
219 {
220 return decode_select(tcp, tcp->u_arg, print_timeval32, sprint_timeval32);
221 }
222 #endif
223
SYS_FUNC(select)224 SYS_FUNC(select)
225 {
226 return decode_select(tcp, tcp->u_arg, print_timeval, sprint_timeval);
227 }
228
229 static int
umove_kulong_array_or_printaddr(struct tcb * const tcp,const kernel_ulong_t addr,kernel_ulong_t * const ptr,const size_t n)230 umove_kulong_array_or_printaddr(struct tcb *const tcp, const kernel_ulong_t addr,
231 kernel_ulong_t *const ptr, const size_t n)
232 {
233 #ifndef current_klongsize
234 if (current_klongsize < sizeof(*ptr)) {
235 uint32_t ptr32[n];
236 int r = umove_or_printaddr(tcp, addr, &ptr32);
237 if (!r) {
238 size_t i;
239
240 for (i = 0; i < n; ++i)
241 ptr[i] = ptr32[i];
242 }
243 return r;
244 }
245 #endif /* !current_klongsize */
246 return umoven_or_printaddr(tcp, addr, n * sizeof(*ptr), ptr);
247 }
248
SYS_FUNC(pselect6)249 SYS_FUNC(pselect6)
250 {
251 int rc = decode_select(tcp, tcp->u_arg, print_timespec, sprint_timespec);
252 if (entering(tcp)) {
253 kernel_ulong_t data[2];
254
255 tprints(", ");
256 if (!umove_kulong_array_or_printaddr(tcp, tcp->u_arg[5],
257 data, ARRAY_SIZE(data))) {
258 tprints("{");
259 /* NB: kernel requires data[1] == NSIG_BYTES */
260 print_sigset_addr_len(tcp, data[0], data[1]);
261 tprintf(", %" PRI_klu "}", data[1]);
262 }
263 }
264
265 return rc;
266 }
267