ndk_cruft.cpp revision b30aff405a220495941f1673b0a5e66c4fa8b84c 
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 <stdio.h>
36#include <stdlib.h>
37#include <sys/resource.h>
38#include <sys/syscall.h>
39#include <sys/time.h>
40#include <sys/types.h>
41#include <sys/wait.h>
42#include <unistd.h>
43
44// These were accidentally declared in <unistd.h> because we stupidly used to inline
45// getpagesize() and __getpageshift(). Needed for backwards compatibility with old NDK apps.
46extern "C" {
47  unsigned int __page_size = PAGE_SIZE;
48  unsigned int __page_shift = 12;
49}
50
51// TODO: remove this backward compatibility hack (for jb-mr1 strace binaries).
52extern "C" pid_t __wait4(pid_t pid, int* status, int options, struct rusage* rusage) {
53  return wait4(pid, status, options, rusage);
54}
55
56// TODO: does anything still need this?
57extern "C" int __open() {
58  abort();
59}
60
61// TODO: does anything still need this?
62extern "C" void** __get_tls() {
63#include "private/__get_tls.h"
64  return __get_tls();
65}
66
67// This non-standard function was in our <string.h> for some reason.
68extern "C" void memswap(void* m1, void* m2, size_t n) {
69  char* p = reinterpret_cast<char*>(m1);
70  char* p_end = p + n;
71  char* q = reinterpret_cast<char*>(m2);
72  while (p < p_end) {
73    char tmp = *p;
74    *p = *q;
75    *q = tmp;
76    p++;
77    q++;
78  }
79}
80
81extern "C" int pthread_attr_setstackaddr(pthread_attr_t*, void*) {
82  // This was removed from POSIX.1-2008, and is not implemented on bionic.
83  // Needed for ABI compatibility with the NDK.
84  return ENOSYS;
85}
86
87extern "C" int pthread_attr_getstackaddr(const pthread_attr_t* attr, void** stack_addr) {
88  // This was removed from POSIX.1-2008.
89  // Needed for ABI compatibility with the NDK.
90  *stack_addr = (char*)attr->stack_base + attr->stack_size;
91  return 0;
92}
93
94// Non-standard cruft that should only ever have been in system/core/toolbox.
95extern "C" char* strtotimeval(const char* str, struct timeval* ts) {
96  char* s;
97  ts->tv_sec = strtoumax(str, &s, 10);
98
99  long fractional_seconds = 0;
100  if (*s == '.') {
101    s++;
102    int count = 0;
103
104    // Read up to 6 digits (microseconds).
105    while (*s && isdigit(*s)) {
106      if (++count < 7) {
107        fractional_seconds = fractional_seconds*10 + (*s - '0');
108      }
109      s++;
110    }
111
112    for (; count < 6; count++) {
113      fractional_seconds *= 10;
114    }
115  }
116
117  ts->tv_usec = fractional_seconds;
118  return s;
119}
120
121static inline int digitval(int ch) {
122  unsigned d;
123
124  d = (unsigned)(ch - '0');
125  if (d < 10) return (int)d;
126
127  d = (unsigned)(ch - 'a');
128  if (d < 6) return (int)(d+10);
129
130  d = (unsigned)(ch - 'A');
131  if (d < 6) return (int)(d+10);
132
133  return -1;
134}
135
136// This non-standard function was in our <inttypes.h> for some reason.
137extern "C" uintmax_t strntoumax(const char *nptr, char **endptr, int base, size_t n) {
138  const unsigned char*  p   = (const unsigned char *)nptr;
139  const unsigned char*  end = p + n;
140  int                   minus = 0;
141  uintmax_t             v = 0;
142  int                   d;
143
144  while (p < end && isspace(*p)) {
145    p++;
146  }
147
148  if (p < end) {
149    char c = p[0];
150    if (c == '-' || c == '+') {
151      minus = (c == '-');
152      p++;
153    }
154  }
155
156  if (base == 0) {
157    if (p+2 < end && p[0] == '0' && (p[1] == 'x' || p[1] == 'X')) {
158      p += 2;
159      base = 16;
160    } else if (p+1 < end && p[0] == '0') {
161      p   += 1;
162      base = 8;
163    } else {
164      base = 10;
165    }
166  } else if (base == 16) {
167    if (p+2 < end && p[0] == '0' && (p[1] == 'x' || p[1] == 'X')) {
168      p += 2;
169    }
170  }
171
172  while (p < end && (d = digitval(*p)) >= 0 && d < base) {
173    v = v*base + d;
174    p += 1;
175  }
176
177  if (endptr) {
178    *endptr = (char*) p;
179  }
180
181  return minus ? -v : v;
182}
183
184// This non-standard function was in our <inttypes.h> for some reason.
185extern "C" intmax_t strntoimax(const char* nptr, char** endptr, int base, size_t n) {
186  return (intmax_t) strntoumax(nptr, endptr, base, n);
187}
188
189// POSIX calls this dprintf, but LP32 Android had fdprintf instead.
190extern "C" int fdprintf(int fd, const char* fmt, ...) {
191  va_list ap;
192  va_start(ap, fmt);
193  int rc = vdprintf(fd, fmt, ap);
194  va_end(ap);
195  return rc;
196}
197
198// POSIX calls this vdprintf, but LP32 Android had fdprintf instead.
199extern "C" int vfdprintf(int fd, const char* fmt, va_list ap) {
200  return vdprintf(fd, fmt, ap);
201}
202
203#define __futex_wake __real_futex_wake
204#define __futex_wait __real_futex_wait
205#include "private/bionic_futex.h"
206#undef __futex_wake
207#undef __futex_wait
208
209// This used to be in <sys/atomics.h>.
210extern "C" int __futex_wake(volatile void* ftx, int count) {
211  return __real_futex_wake(ftx, count);
212}
213
214// This used to be in <sys/atomics.h>.
215extern "C" int __futex_wait(volatile void* ftx, int value, const struct timespec* timeout) {
216  return __real_futex_wait(ftx, value, timeout);
217}
218
219// Unity's libmono uses this.
220extern "C" int tkill(pid_t tid, int sig) {
221  return syscall(__NR_tkill, tid, sig);
222}
223
224#endif
225