ndk_cruft.cpp revision 205dd7d9b3ba314ef8601e4613823c2d62a0605b 
1/*
2 * Copyright (C) 2013 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29// This file perpetuates the mistakes of the past, but only for 32-bit targets.
30#if !defined(__LP64__)
31
32#include <ctype.h>
33#include <inttypes.h>
34#include <pthread.h>
35#include <signal.h>
36#include <stdio.h>
37#include <stdlib.h>
38#include <sys/resource.h>
39#include <sys/syscall.h>
40#include <sys/time.h>
41#include <sys/types.h>
42#include <sys/wait.h>
43#include <unistd.h>
44#include <wchar.h>
45
46// These were accidentally declared in <unistd.h> because we stupidly used to inline
47// getpagesize() and __getpageshift(). Needed for backwards compatibility with old NDK apps.
48extern "C" {
49  unsigned int __page_size = PAGE_SIZE;
50  unsigned int __page_shift = 12;
51}
52
53// TODO: remove this backward compatibility hack (for jb-mr1 strace binaries).
54extern "C" pid_t __wait4(pid_t pid, int* status, int options, struct rusage* rusage) {
55  return wait4(pid, status, options, rusage);
56}
57
58// TODO: does anything still need this?
59extern "C" int __open() {
60  abort();
61}
62
63// TODO: does anything still need this?
64extern "C" void** __get_tls() {
65#include "private/__get_tls.h"
66  return __get_tls();
67}
68
69// This non-standard function was in our <string.h> for some reason.
70extern "C" void memswap(void* m1, void* m2, size_t n) {
71  char* p = reinterpret_cast<char*>(m1);
72  char* p_end = p + n;
73  char* q = reinterpret_cast<char*>(m2);
74  while (p < p_end) {
75    char tmp = *p;
76    *p = *q;
77    *q = tmp;
78    p++;
79    q++;
80  }
81}
82
83extern "C" int pthread_attr_setstackaddr(pthread_attr_t*, void*) {
84  // This was removed from POSIX.1-2008, and is not implemented on bionic.
85  // Needed for ABI compatibility with the NDK.
86  return ENOSYS;
87}
88
89extern "C" int pthread_attr_getstackaddr(const pthread_attr_t* attr, void** stack_addr) {
90  // This was removed from POSIX.1-2008.
91  // Needed for ABI compatibility with the NDK.
92  *stack_addr = (char*)attr->stack_base + attr->stack_size;
93  return 0;
94}
95
96// Non-standard cruft that should only ever have been in system/core/toolbox.
97extern "C" char* strtotimeval(const char* str, struct timeval* ts) {
98  char* s;
99  ts->tv_sec = strtoumax(str, &s, 10);
100
101  long fractional_seconds = 0;
102  if (*s == '.') {
103    s++;
104    int count = 0;
105
106    // Read up to 6 digits (microseconds).
107    while (*s && isdigit(*s)) {
108      if (++count < 7) {
109        fractional_seconds = fractional_seconds*10 + (*s - '0');
110      }
111      s++;
112    }
113
114    for (; count < 6; count++) {
115      fractional_seconds *= 10;
116    }
117  }
118
119  ts->tv_usec = fractional_seconds;
120  return s;
121}
122
123static inline int digitval(int ch) {
124  unsigned d;
125
126  d = (unsigned)(ch - '0');
127  if (d < 10) return (int)d;
128
129  d = (unsigned)(ch - 'a');
130  if (d < 6) return (int)(d+10);
131
132  d = (unsigned)(ch - 'A');
133  if (d < 6) return (int)(d+10);
134
135  return -1;
136}
137
138// This non-standard function was in our <inttypes.h> for some reason.
139extern "C" uintmax_t strntoumax(const char *nptr, char **endptr, int base, size_t n) {
140  const unsigned char*  p   = (const unsigned char *)nptr;
141  const unsigned char*  end = p + n;
142  int                   minus = 0;
143  uintmax_t             v = 0;
144  int                   d;
145
146  while (p < end && isspace(*p)) {
147    p++;
148  }
149
150  if (p < end) {
151    char c = p[0];
152    if (c == '-' || c == '+') {
153      minus = (c == '-');
154      p++;
155    }
156  }
157
158  if (base == 0) {
159    if (p+2 < end && p[0] == '0' && (p[1] == 'x' || p[1] == 'X')) {
160      p += 2;
161      base = 16;
162    } else if (p+1 < end && p[0] == '0') {
163      p   += 1;
164      base = 8;
165    } else {
166      base = 10;
167    }
168  } else if (base == 16) {
169    if (p+2 < end && p[0] == '0' && (p[1] == 'x' || p[1] == 'X')) {
170      p += 2;
171    }
172  }
173
174  while (p < end && (d = digitval(*p)) >= 0 && d < base) {
175    v = v*base + d;
176    p += 1;
177  }
178
179  if (endptr) {
180    *endptr = (char*) p;
181  }
182
183  return minus ? -v : v;
184}
185
186// This non-standard function was in our <inttypes.h> for some reason.
187extern "C" intmax_t strntoimax(const char* nptr, char** endptr, int base, size_t n) {
188  return (intmax_t) strntoumax(nptr, endptr, base, n);
189}
190
191// POSIX calls this dprintf, but LP32 Android had fdprintf instead.
192extern "C" int fdprintf(int fd, const char* fmt, ...) {
193  va_list ap;
194  va_start(ap, fmt);
195  int rc = vdprintf(fd, fmt, ap);
196  va_end(ap);
197  return rc;
198}
199
200// POSIX calls this vdprintf, but LP32 Android had fdprintf instead.
201extern "C" int vfdprintf(int fd, const char* fmt, va_list ap) {
202  return vdprintf(fd, fmt, ap);
203}
204
205#define __futex_wake __real_futex_wake
206#define __futex_wait __real_futex_wait
207#include "private/bionic_futex.h"
208#undef __futex_wake
209#undef __futex_wait
210
211// This used to be in <sys/atomics.h>.
212extern "C" int __futex_wake(volatile void* ftx, int count) {
213  return __real_futex_wake(ftx, count);
214}
215
216// This used to be in <sys/atomics.h>.
217extern "C" int __futex_wait(volatile void* ftx, int value, const struct timespec* timeout) {
218  return __real_futex_wait(ftx, value, timeout);
219}
220
221// Unity's libmono uses this.
222extern "C" int tkill(pid_t tid, int sig) {
223  return syscall(__NR_tkill, tid, sig);
224}
225
226extern "C" wchar_t* wcswcs(wchar_t* haystack, wchar_t* needle) {
227  return wcsstr(haystack, needle);
228}
229
230// This was removed from POSIX 2008.
231extern "C" sighandler_t bsd_signal(int signum, sighandler_t handler) {
232  return signal(signum, handler);
233}
234
235// sysv_signal() was never in POSIX.
236extern sighandler_t _signal(int signum, sighandler_t handler, int flags);
237extern "C" sighandler_t sysv_signal(int signum, sighandler_t handler) {
238  return _signal(signum, handler, SA_RESETHAND);
239}
240
241#endif
242