ndk_cruft.cpp revision fc829736e1f399a2b82058b24bb94f6bdab22469 
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 <dirent.h>
34#include <inttypes.h>
35#include <pthread.h>
36#include <signal.h>
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40#include <sys/resource.h>
41#include <sys/syscall.h>
42#include <sys/time.h>
43#include <sys/types.h>
44#include <sys/wait.h>
45#include <unistd.h>
46#include <wchar.h>
47
48// These were accidentally declared in <unistd.h> because we stupidly used to inline
49// getpagesize() and __getpageshift(). Needed for backwards compatibility with old NDK apps.
50extern "C" {
51  unsigned int __page_size = PAGE_SIZE;
52  unsigned int __page_shift = 12;
53}
54
55// TODO: remove this backward compatibility hack (for jb-mr1 strace binaries).
56extern "C" pid_t __wait4(pid_t pid, int* status, int options, struct rusage* rusage) {
57  return wait4(pid, status, options, rusage);
58}
59
60// TODO: does anything still need this?
61extern "C" int __open() {
62  abort();
63}
64
65// TODO: does anything still need this?
66extern "C" void** __get_tls() {
67#include "private/__get_tls.h"
68  return __get_tls();
69}
70
71// This non-standard function was in our <string.h> for some reason.
72extern "C" void memswap(void* m1, void* m2, size_t n) {
73  char* p = reinterpret_cast<char*>(m1);
74  char* p_end = p + n;
75  char* q = reinterpret_cast<char*>(m2);
76  while (p < p_end) {
77    char tmp = *p;
78    *p = *q;
79    *q = tmp;
80    p++;
81    q++;
82  }
83}
84
85extern "C" int pthread_attr_setstackaddr(pthread_attr_t*, void*) {
86  // This was removed from POSIX.1-2008, and is not implemented on bionic.
87  // Needed for ABI compatibility with the NDK.
88  return ENOSYS;
89}
90
91extern "C" int pthread_attr_getstackaddr(const pthread_attr_t* attr, void** stack_addr) {
92  // This was removed from POSIX.1-2008.
93  // Needed for ABI compatibility with the NDK.
94  *stack_addr = (char*)attr->stack_base + attr->stack_size;
95  return 0;
96}
97
98// Non-standard cruft that should only ever have been in system/core/toolbox.
99extern "C" char* strtotimeval(const char* str, struct timeval* ts) {
100  char* s;
101  ts->tv_sec = strtoumax(str, &s, 10);
102
103  long fractional_seconds = 0;
104  if (*s == '.') {
105    s++;
106    int count = 0;
107
108    // Read up to 6 digits (microseconds).
109    while (*s && isdigit(*s)) {
110      if (++count < 7) {
111        fractional_seconds = fractional_seconds*10 + (*s - '0');
112      }
113      s++;
114    }
115
116    for (; count < 6; count++) {
117      fractional_seconds *= 10;
118    }
119  }
120
121  ts->tv_usec = fractional_seconds;
122  return s;
123}
124
125static inline int digitval(int ch) {
126  unsigned d;
127
128  d = (unsigned)(ch - '0');
129  if (d < 10) return (int)d;
130
131  d = (unsigned)(ch - 'a');
132  if (d < 6) return (int)(d+10);
133
134  d = (unsigned)(ch - 'A');
135  if (d < 6) return (int)(d+10);
136
137  return -1;
138}
139
140// This non-standard function was in our <inttypes.h> for some reason.
141extern "C" uintmax_t strntoumax(const char *nptr, char **endptr, int base, size_t n) {
142  const unsigned char*  p   = (const unsigned char *)nptr;
143  const unsigned char*  end = p + n;
144  int                   minus = 0;
145  uintmax_t             v = 0;
146  int                   d;
147
148  while (p < end && isspace(*p)) {
149    p++;
150  }
151
152  if (p < end) {
153    char c = p[0];
154    if (c == '-' || c == '+') {
155      minus = (c == '-');
156      p++;
157    }
158  }
159
160  if (base == 0) {
161    if (p+2 < end && p[0] == '0' && (p[1] == 'x' || p[1] == 'X')) {
162      p += 2;
163      base = 16;
164    } else if (p+1 < end && p[0] == '0') {
165      p   += 1;
166      base = 8;
167    } else {
168      base = 10;
169    }
170  } else if (base == 16) {
171    if (p+2 < end && p[0] == '0' && (p[1] == 'x' || p[1] == 'X')) {
172      p += 2;
173    }
174  }
175
176  while (p < end && (d = digitval(*p)) >= 0 && d < base) {
177    v = v*base + d;
178    p += 1;
179  }
180
181  if (endptr) {
182    *endptr = (char*) p;
183  }
184
185  return minus ? -v : v;
186}
187
188// This non-standard function was in our <inttypes.h> for some reason.
189extern "C" intmax_t strntoimax(const char* nptr, char** endptr, int base, size_t n) {
190  return (intmax_t) strntoumax(nptr, endptr, base, n);
191}
192
193// POSIX calls this dprintf, but LP32 Android had fdprintf instead.
194extern "C" int fdprintf(int fd, const char* fmt, ...) {
195  va_list ap;
196  va_start(ap, fmt);
197  int rc = vdprintf(fd, fmt, ap);
198  va_end(ap);
199  return rc;
200}
201
202// POSIX calls this vdprintf, but LP32 Android had fdprintf instead.
203extern "C" int vfdprintf(int fd, const char* fmt, va_list ap) {
204  return vdprintf(fd, fmt, ap);
205}
206
207#define __futex_wake __real_futex_wake
208#define __futex_wait __real_futex_wait
209#include "private/bionic_futex.h"
210#undef __futex_wake
211#undef __futex_wait
212
213// This used to be in <sys/atomics.h>.
214extern "C" int __futex_wake(volatile void* ftx, int count) {
215  return __real_futex_wake(ftx, count);
216}
217
218// This used to be in <sys/atomics.h>.
219extern "C" int __futex_wait(volatile void* ftx, int value, const struct timespec* timeout) {
220  return __real_futex_wait(ftx, value, timeout);
221}
222
223// Unity's libmono uses this.
224extern "C" int tkill(pid_t tid, int sig) {
225  return syscall(__NR_tkill, tid, sig);
226}
227
228// This was removed from POSIX 2008.
229extern "C" wchar_t* wcswcs(wchar_t* haystack, wchar_t* needle) {
230  return wcsstr(haystack, needle);
231}
232
233// This was removed from POSIX 2008.
234extern "C" sighandler_t bsd_signal(int signum, sighandler_t handler) {
235  return signal(signum, handler);
236}
237
238// sysv_signal() was never in POSIX.
239extern sighandler_t _signal(int signum, sighandler_t handler, int flags);
240extern "C" sighandler_t sysv_signal(int signum, sighandler_t handler) {
241  return _signal(signum, handler, SA_RESETHAND);
242}
243
244// This is a system call that was never in POSIX. Use readdir(3) instead.
245extern "C" int __getdents64(unsigned int, dirent*, unsigned int);
246extern "C" int getdents(unsigned int fd, dirent* dirp, unsigned int count) {
247  return __getdents64(fd, dirp, count);
248}
249
250// This is a BSDism that we never implemented correctly. Used by Firefox.
251extern "C" int issetugid() {
252  return 0;
253}
254
255// This was removed from POSIX 2004.
256extern "C" pid_t wait3(int* status, int options, struct rusage* rusage) {
257  return wait4(-1, status, options, rusage);
258}
259
260// This was removed from POSIX 2004.
261extern "C" int getdtablesize() {
262  struct rlimit r;
263
264  if (getrlimit(RLIMIT_NOFILE, &r) < 0) {
265    return sysconf(_SC_OPEN_MAX);
266  }
267
268  return r.rlim_cur;
269}
270
271// Only used by ftime, which was removed from POSIX 2008.
272struct timeb {
273  time_t          time;
274  unsigned short  millitm;
275  short           timezone;
276  short           dstflag;
277};
278
279// This was removed from POSIX 2008.
280extern "C" int ftime(struct timeb* tb) {
281  struct timeval  tv;
282  struct timezone tz;
283
284  if (gettimeofday(&tv, &tz) < 0)
285    return -1;
286
287  tb->time    = tv.tv_sec;
288  tb->millitm = (tv.tv_usec + 500) / 1000;
289
290  if (tb->millitm == 1000) {
291    ++tb->time;
292    tb->millitm = 0;
293  }
294
295  tb->timezone = tz.tz_minuteswest;
296  tb->dstflag  = tz.tz_dsttime;
297
298  return 0;
299}
300
301// This was removed from POSIX 2008.
302extern "C" char* index(const char* str, int ch) {
303  return strchr(str, ch);
304}
305
306// This was removed from BSD.
307extern "C" void arc4random_stir(void) {
308  // The current implementation stirs itself as needed.
309}
310
311// This was removed from BSD.
312extern "C" void arc4random_addrandom(unsigned char*, int) {
313  // The current implementation adds randomness as needed.
314}
315
316// Old versions of the NDK did not export malloc_usable_size, but did
317// export dlmalloc_usable_size. We are moving away from dlmalloc in L
318// so make this call malloc_usable_size.
319extern "C" size_t dlmalloc_usable_size(void* ptr) {
320  return malloc_usable_size(ptr);
321}
322
323#endif
324