1 /*
2 * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
3 * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include "defs.h"
30 #include <poll.h>
31
32 #include "xlat/pollflags.h"
33
34 static bool
print_pollfd(struct tcb * tcp,void * elem_buf,size_t elem_size,void * data)35 print_pollfd(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
36 {
37 const struct pollfd *fds = elem_buf;
38
39 tprints("{fd=");
40 printfd(tcp, fds->fd);
41 if (fds->fd >= 0) {
42 tprints(", events=");
43 printflags(pollflags, (unsigned short) fds->events, "POLL???");
44 }
45 tprints("}");
46
47 return true;
48 }
49
50 static void
decode_poll_entering(struct tcb * tcp)51 decode_poll_entering(struct tcb *tcp)
52 {
53 const kernel_ulong_t addr = tcp->u_arg[0];
54 const unsigned int nfds = tcp->u_arg[1];
55 struct pollfd fds;
56
57 print_array(tcp, addr, nfds, &fds, sizeof(fds),
58 umoven_or_printaddr, print_pollfd, 0);
59 tprintf(", %u, ", nfds);
60 }
61
62 static int
decode_poll_exiting(struct tcb * const tcp,const kernel_ulong_t pts)63 decode_poll_exiting(struct tcb *const tcp, const kernel_ulong_t pts)
64 {
65 struct pollfd fds;
66 const unsigned int nfds = tcp->u_arg[1];
67 const unsigned long size = sizeof(fds) * nfds;
68 const kernel_ulong_t start = tcp->u_arg[0];
69 const kernel_ulong_t end = start + size;
70 kernel_ulong_t cur;
71 const unsigned int max_printed =
72 abbrev(tcp) ? max_strlen : -1U;
73 unsigned int printed;
74
75 static char outstr[1024];
76 char *outptr;
77 #define end_outstr (outstr + sizeof(outstr))
78
79 if (syserror(tcp))
80 return 0;
81 if (tcp->u_rval == 0) {
82 tcp->auxstr = "Timeout";
83 return RVAL_STR;
84 }
85
86 if (!verbose(tcp) || !start || !nfds ||
87 size / sizeof(fds) != nfds || end < start)
88 return 0;
89
90 outptr = outstr;
91
92 for (printed = 0, cur = start; cur < end; cur += sizeof(fds)) {
93 if (umove(tcp, cur, &fds) < 0) {
94 if (outptr == outstr)
95 *outptr++ = '[';
96 else
97 outptr = stpcpy(outptr, ", ");
98 outptr += sprintf(outptr, "%#" PRI_klx, cur);
99 break;
100 }
101 if (!fds.revents)
102 continue;
103 if (outptr == outstr)
104 *outptr++ = '[';
105 else
106 outptr = stpcpy(outptr, ", ");
107 if (printed >= max_printed) {
108 outptr = stpcpy(outptr, "...");
109 break;
110 }
111
112 static const char fmt[] = "{fd=%d, revents=";
113 char fdstr[sizeof(fmt) + sizeof(int) * 3];
114 sprintf(fdstr, fmt, fds.fd);
115
116 const char *flagstr = sprintflags("", pollflags,
117 (unsigned short) fds.revents);
118
119 if (outptr + strlen(fdstr) + strlen(flagstr) + 1 >=
120 end_outstr - (2 + 2 * sizeof(long) + sizeof(", ], ..."))) {
121 outptr = stpcpy(outptr, "...");
122 break;
123 }
124 outptr = stpcpy(outptr, fdstr);
125 outptr = stpcpy(outptr, flagstr);
126 *outptr++ = '}';
127 ++printed;
128 }
129
130 if (outptr != outstr)
131 *outptr++ = ']';
132
133 *outptr = '\0';
134 if (pts) {
135 const char *str = sprint_timespec(tcp, pts);
136
137 if (outptr + sizeof(", left ") + strlen(str) < end_outstr) {
138 outptr = stpcpy(outptr, outptr == outstr ? "left " : ", left ");
139 outptr = stpcpy(outptr, str);
140 } else {
141 outptr = stpcpy(outptr, ", ...");
142 }
143 }
144
145 if (outptr == outstr)
146 return 0;
147
148 tcp->auxstr = outstr;
149 return RVAL_STR;
150 #undef end_outstr
151 }
152
SYS_FUNC(poll)153 SYS_FUNC(poll)
154 {
155 if (entering(tcp)) {
156 decode_poll_entering(tcp);
157 int timeout = tcp->u_arg[2];
158
159 #ifdef INFTIM
160 if (INFTIM == timeout)
161 tprints("INFTIM");
162 else
163 #endif
164 tprintf("%d", timeout);
165
166 return 0;
167 } else {
168 return decode_poll_exiting(tcp, 0);
169 }
170 }
171
SYS_FUNC(ppoll)172 SYS_FUNC(ppoll)
173 {
174 if (entering(tcp)) {
175 decode_poll_entering(tcp);
176
177 print_timespec(tcp, tcp->u_arg[2]);
178 tprints(", ");
179 /* NB: kernel requires arg[4] == NSIG_BYTES */
180 print_sigset_addr_len(tcp, tcp->u_arg[3], tcp->u_arg[4]);
181 tprintf(", %" PRI_klu, tcp->u_arg[4]);
182
183 return 0;
184 } else {
185 return decode_poll_exiting(tcp, tcp->u_arg[2]);
186 }
187 }
188