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 * Copyright (c) 1999-2018 The strace developers.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. The name of the author may not be used to endorse or promote products
18 * derived from this software without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37 printfd(tcp, tcp->u_arg[0]);
44 printfd(tcp, tcp->u_arg[0]);
46 return RVAL_DECODED | RVAL_FD;
50 do_dup2(struct tcb *tcp, int flags_arg)
52 printfd(tcp, tcp->u_arg[0]);
54 printfd(tcp, tcp->u_arg[1]);
57 printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
60 return RVAL_DECODED | RVAL_FD;
65 return do_dup2(tcp, -1);
70 return do_dup2(tcp, 2);
74 decode_select(struct tcb *const tcp, const kernel_ulong_t *const args,
75 void (*const print_tv_ts) (struct tcb *, kernel_ulong_t),
76 const char * (*const sprint_tv_ts) (struct tcb *, kernel_ulong_t))
84 /* Kernel truncates args[0] to int, we do the same. */
87 /* Kernel rejects negative nfds, so we don't parse it either. */
91 /* Beware of select(2^31-1, NULL, NULL, NULL) and similar... */
96 * We had bugs a-la "while (j < args[0])" and "umoven(args[0])" below.
97 * Instead of args[0], use nfds for fd count, fdsize for array lengths.
99 fdsize = (((nfds + 7) / 8) + current_wordsize-1) & -current_wordsize;
102 tprintf("%d", (int) args[0]);
104 if (verbose(tcp) && fdsize > 0)
105 fds = malloc(fdsize);
106 for (i = 0; i < 3; i++) {
113 if (umoven_or_printaddr(tcp, addr, fdsize, fds))
116 for (j = 0, sep = "";; j++) {
117 j = next_set_bit(fds, j, nfds);
128 print_tv_ts(tcp, args[4]);
130 static char outstr[1024];
132 #define end_outstr (outstr + sizeof(outstr))
138 ready_fds = tcp->u_rval;
139 if (ready_fds == 0) {
140 tcp->auxstr = "Timeout";
144 fds = malloc(fdsize);
148 for (i = 0; i < 3 && ready_fds > 0; i++) {
152 if (!addr || !fds || umoven(tcp, addr, fdsize, fds) < 0)
155 j = next_set_bit(fds, j, nfds);
158 /* +2 chars needed at the end: ']',NUL */
159 if (outptr < end_outstr - (sizeof(", except [") + sizeof(int)*3 + 2)) {
161 outptr = xappendstr(outstr,
165 i == 0 ? "in" : i == 1 ? "out" : "except",
171 outptr = xappendstr(outstr,
176 if (--ready_fds == 0)
179 if (outptr != outstr)
183 /* This contains no useful information on SunOS. */
185 const char *str = sprint_tv_ts(tcp, args[4]);
186 if (outptr + sizeof("left ") + strlen(sep) + strlen(str) < end_outstr) {
187 outptr = xappendstr(outstr, outptr,
188 "%sleft %s", sep, str);
192 tcp->auxstr = outstr;
199 #if HAVE_ARCH_OLD_SELECT
202 kernel_ulong_t *args =
203 fetch_indirect_syscall_args(tcp, tcp->u_arg[0], 5);
206 return decode_select(tcp, args, print_timeval, sprint_timeval);
209 printaddr(tcp->u_arg[0]);
213 #endif /* HAVE_ARCH_OLD_SELECT */
218 return decode_select(tcp, tcp->u_arg, print_timeval32, sprint_timeval32);
224 return decode_select(tcp, tcp->u_arg, print_timeval, sprint_timeval);
228 umove_kulong_array_or_printaddr(struct tcb *const tcp, const kernel_ulong_t addr,
229 kernel_ulong_t *const ptr, const size_t n)
231 #ifndef current_klongsize
232 if (current_klongsize < sizeof(*ptr)) {
234 int r = umove_or_printaddr(tcp, addr, &ptr32);
238 for (i = 0; i < n; ++i)
243 #endif /* !current_klongsize */
244 return umoven_or_printaddr(tcp, addr, n * sizeof(*ptr), ptr);
249 int rc = decode_select(tcp, tcp->u_arg, print_timespec, sprint_timespec);
251 kernel_ulong_t data[2];
254 if (!umove_kulong_array_or_printaddr(tcp, tcp->u_arg[5],
255 data, ARRAY_SIZE(data))) {
257 /* NB: kernel requires data[1] == NSIG_BYTES */
258 print_sigset_addr_len(tcp, data[0], data[1]);
259 tprintf(", %" PRI_klu "}", data[1]);