ndk_cruft.cpp revision bd3a98c6b9850a8e55fb0e0ed9f045212c494881 
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 <linux/futex.h>
35#include <pthread.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
45// These were accidentally declared in <unistd.h> because we stupidly used to inline
46// getpagesize() and __getpageshift(). Needed for backwards compatibility with old NDK apps.
47extern "C" {
48  unsigned int __page_size = PAGE_SIZE;
49  unsigned int __page_shift = 12;
50}
51
52// TODO: remove this backward compatibility hack (for jb-mr1 strace binaries).
53extern "C" pid_t __wait4(pid_t pid, int* status, int options, struct rusage* rusage) {
54  return wait4(pid, status, options, rusage);
55}
56
57// TODO: does anything still need this?
58extern "C" int __open() {
59  abort();
60}
61
62// TODO: does anything still need this?
63extern "C" void** __get_tls() {
64#include "private/__get_tls.h"
65  return __get_tls();
66}
67
68// This non-standard function was in our <string.h> for some reason.
69extern "C" void memswap(void* m1, void* m2, size_t n) {
70  char* p = reinterpret_cast<char*>(m1);
71  char* p_end = p + n;
72  char* q = reinterpret_cast<char*>(m2);
73  while (p < p_end) {
74    char tmp = *p;
75    *p = *q;
76    *q = tmp;
77    p++;
78    q++;
79  }
80}
81
82extern "C" int pthread_attr_setstackaddr(pthread_attr_t*, void*) {
83  // This was removed from POSIX.1-2008, and is not implemented on bionic.
84  // Needed for ABI compatibility with the NDK.
85  return ENOSYS;
86}
87
88extern "C" int pthread_attr_getstackaddr(const pthread_attr_t* attr, void** stack_addr) {
89  // This was removed from POSIX.1-2008.
90  // Needed for ABI compatibility with the NDK.
91  *stack_addr = (char*)attr->stack_base + attr->stack_size;
92  return 0;
93}
94
95// Non-standard cruft that should only ever have been in system/core/toolbox.
96extern "C" char* strtotimeval(const char* str, struct timeval* ts) {
97  char* s;
98  ts->tv_sec = strtoumax(str, &s, 10);
99
100  long fractional_seconds = 0;
101  if (*s == '.') {
102    s++;
103    int count = 0;
104
105    // Read up to 6 digits (microseconds).
106    while (*s && isdigit(*s)) {
107      if (++count < 7) {
108        fractional_seconds = fractional_seconds*10 + (*s - '0');
109      }
110      s++;
111    }
112
113    for (; count < 6; count++) {
114      fractional_seconds *= 10;
115    }
116  }
117
118  ts->tv_usec = fractional_seconds;
119  return s;
120}
121
122static inline int digitval(int ch) {
123  unsigned d;
124
125  d = (unsigned)(ch - '0');
126  if (d < 10) return (int)d;
127
128  d = (unsigned)(ch - 'a');
129  if (d < 6) return (int)(d+10);
130
131  d = (unsigned)(ch - 'A');
132  if (d < 6) return (int)(d+10);
133
134  return -1;
135}
136
137// This non-standard function was in our <inttypes.h> for some reason.
138extern "C" uintmax_t strntoumax(const char *nptr, char **endptr, int base, size_t n) {
139  const unsigned char*  p   = (const unsigned char *)nptr;
140  const unsigned char*  end = p + n;
141  int                   minus = 0;
142  uintmax_t             v = 0;
143  int                   d;
144
145  while (p < end && isspace(*p)) {
146    p++;
147  }
148
149  if (p < end) {
150    char c = p[0];
151    if (c == '-' || c == '+') {
152      minus = (c == '-');
153      p++;
154    }
155  }
156
157  if (base == 0) {
158    if (p+2 < end && p[0] == '0' && (p[1] == 'x' || p[1] == 'X')) {
159      p += 2;
160      base = 16;
161    } else if (p+1 < end && p[0] == '0') {
162      p   += 1;
163      base = 8;
164    } else {
165      base = 10;
166    }
167  } else if (base == 16) {
168    if (p+2 < end && p[0] == '0' && (p[1] == 'x' || p[1] == 'X')) {
169      p += 2;
170    }
171  }
172
173  while (p < end && (d = digitval(*p)) >= 0 && d < base) {
174    v = v*base + d;
175    p += 1;
176  }
177
178  if (endptr) {
179    *endptr = (char*) p;
180  }
181
182  return minus ? -v : v;
183}
184
185// This non-standard function was in our <inttypes.h> for some reason.
186extern "C" intmax_t strntoimax(const char* nptr, char** endptr, int base, size_t n) {
187  return (intmax_t) strntoumax(nptr, endptr, base, n);
188}
189
190// POSIX calls this dprintf, but LP32 Android had fdprintf instead.
191extern "C" int fdprintf(int fd, const char* fmt, ...) {
192  va_list ap;
193  va_start(ap, fmt);
194  int rc = vdprintf(fd, fmt, ap);
195  va_end(ap);
196  return rc;
197}
198
199// POSIX calls this vdprintf, but LP32 Android had fdprintf instead.
200extern "C" int vfdprintf(int fd, const char* fmt, va_list ap) {
201  return vdprintf(fd, fmt, ap);
202}
203
204static inline int __futex(volatile void* ftx, int op, int value, const struct timespec* timeout) {
205  // Our generated syscall assembler sets errno, but our callers (pthread functions) don't want to.
206  int saved_errno = errno;
207  if (syscall(__NR_futex, ftx, op, value, timeout) == 0) {
208    return 0;
209  }
210  int result = -errno;
211  errno = saved_errno;
212  return result;
213}
214
215// This used to be in <sys/atomics.h>.
216extern "C" int __futex_wake(volatile void* ftx, int count) {
217  return __futex(ftx, FUTEX_WAKE, count, NULL);
218}
219
220// This used to be in <sys/atomics.h>.
221extern "C" int __futex_wait(volatile void* ftx, int value, const struct timespec* timeout) {
222  return __futex(ftx, FUTEX_WAIT, value, timeout);
223}
224
225#endif
226