Mercurial > hg > toybox
annotate lib/portability.h @ 1571:e85e5f3b87c2 draft
As long as Android's going to require fortify, fixup the warnings it generates.
author | Rob Landley <rob@landley.net> |
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date | Sat, 22 Nov 2014 00:36:45 -0600 |
parents | da72fa267b7b |
children | ce22ad7a26c1 |
rev | line source |
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691
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Older versions of glibc predated posix-2008. They still provide most of what we need, but require a boot to the headers to get them to admit it. Note that uClibc lies and claims to be glibc so we have to specifically exclude it here.
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1 // Workarounds for horrible build environment idiosyncrasies. |
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3 // Instead of polluting the code with strange #ifdefs to work around bugs |
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4 // in specific compiler, library, or OS versions, localize all that here |
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5 // and in portability.c |
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6 |
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Group headers by standard (POSIX or LSB) or function (internationalization, networking). Move headers standards ignore (but which have been there >15 years) to lib/portability.h. Fold xregcomp into lib since it's posix.
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7 // For musl |
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8 #define _ALL_SOURCE |
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9 |
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10 // Test for gcc (using compiler builtin #define) |
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11 |
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12 #ifdef __GNUC__ |
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13 #define noreturn __attribute__((noreturn)) |
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14 #else |
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15 #define noreturn |
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16 #endif |
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17 |
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18 // Always use long file support. |
533 | 19 #define _FILE_OFFSET_BITS 64 |
20 | |
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21 // This isn't in the spec, but it's how we determine what libc we're using. |
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22 |
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More header fiddling: crypt.h is silly, SUSv4 requires crypt() to be prototyped in unistd.h. The fact glibc refuses to do so without a wacky #define is a glibc bug, treat it as such.
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23 #include <features.h> |
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24 |
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25 // Various constants old build environments might not have even if kernel does |
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26 |
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27 #ifndef AT_FDCWD |
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28 #define AT_FDCWD -100 |
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29 #endif |
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30 |
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31 #ifndef AT_SYMLINK_NOFOLLOW |
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32 #define AT_SYMLINK_NOFOLLOW 0x100 |
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33 #endif |
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34 |
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35 #ifndef AT_REMOVEDIR |
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36 #define AT_REMOVEDIR 0x200 |
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37 #endif |
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38 |
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39 // We don't define GNU_dammit because we're not part of the gnu project, and |
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40 // don't want to get any FSF on us. Unfortunately glibc (gnu libc) |
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41 // won't give us Linux syscall wrappers without claiming to be part of the |
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42 // gnu project (because Stallman's "GNU owns Linux" revisionist history |
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43 // crusade includes the kernel, even though Linux was inspired by Minix). |
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44 |
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45 // We use most non-posix Linux syscalls directly through the syscall() wrapper, |
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46 // but even many posix-2008 functions aren't provided by glibc unless you |
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47 // claim it's in the name of Gnu. |
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48 |
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49 #if defined(__GLIBC__) |
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50 // "Function prototypes shall be provided." but aren't. |
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51 // http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/unistd.h.html |
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52 char *crypt(const char *key, const char *salt); |
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53 |
1395 | 54 // According to posix, #include header, get a function definition. But glibc... |
55 // http://pubs.opengroup.org/onlinepubs/9699919799/functions/wcwidth.html | |
56 #include <wchar.h> | |
57 int wcwidth(wchar_t wc); | |
58 | |
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59 // see http://pubs.opengroup.org/onlinepubs/9699919799/functions/strptime.html |
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60 #include <time.h> |
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61 char *strptime(const char *buf, const char *format, struct tm *tm); |
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62 |
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63 // uClibc pretends to be glibc and copied a lot of its bugs, but has a few more |
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64 #if defined(__UCLIBC__) |
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65 #include <unistd.h> |
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66 #include <stdio.h> |
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67 ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream); |
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68 char *stpcpy(char *dest, const char *src); |
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69 pid_t getsid(pid_t pid); |
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70 |
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71 // uClibc's last-ever release was in 2012, so of course it doesn't define |
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72 // any flag newer than MS_MOVE, which was added in 2001 (linux 2.5.0.5), |
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73 // eleven years earlier. |
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74 |
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75 #define MS_MOVE (1<<13) |
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76 #define MS_REC (1<<14) |
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77 #define MS_SILENT (1<<15) |
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78 #define MS_UNBINDABLE (1<<17) |
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79 #define MS_PRIVATE (1<<18) |
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80 #define MS_SLAVE (1<<19) |
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81 #define MS_SHARED (1<<20) |
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82 |
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83 // When building under obsolete glibc (Ubuntu 8.04-ish), hold its hand a bit. |
800
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84 #elif __GLIBC__ == 2 && __GLIBC_MINOR__ < 10 |
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85 #define fstatat fstatat64 |
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86 int fstatat64(int dirfd, const char *pathname, void *buf, int flags); |
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87 int readlinkat(int dirfd, const char *pathname, char *buf, size_t bufsiz); |
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88 char *stpcpy(char *dest, const char *src); |
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89 #include <sys/stat.h> |
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90 int fchmodat(int dirfd, const char *pathname, mode_t mode, int flags); |
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91 int openat(int dirfd, const char *pathname, int flags, ...); |
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92 #include <dirent.h> |
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93 DIR *fdopendir(int fd); |
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94 #include <unistd.h> |
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95 int fchownat(int dirfd, const char *pathname, |
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96 uid_t owner, gid_t group, int flags); |
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97 int isblank(int c); |
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98 int unlinkat(int dirfd, const char *pathname, int flags); |
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Older versions of glibc predated posix-2008. They still provide most of what we need, but require a boot to the headers to get them to admit it. Note that uClibc lies and claims to be glibc so we have to specifically exclude it here.
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99 #include <stdio.h> |
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Older versions of glibc predated posix-2008. They still provide most of what we need, but require a boot to the headers to get them to admit it. Note that uClibc lies and claims to be glibc so we have to specifically exclude it here.
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100 ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream); |
800
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101 |
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102 // Straight from posix-2008, things old glibc had but didn't prototype |
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103 |
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104 int faccessat(int fd, const char *path, int amode, int flag); |
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105 int linkat(int fd1, const char *path1, int fd2, const char *path2, int flag); |
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106 int mkdirat(int fd, const char *path, mode_t mode); |
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107 int symlinkat(const char *path1, int fd, const char *path2); |
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108 int mknodat(int fd, const char *path, mode_t mode, dev_t dev); |
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109 #include <sys/time.h> |
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110 int futimens(int fd, const struct timespec times[2]); |
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111 int utimensat(int fd, const char *path, const struct timespec times[2], int flag); |
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112 |
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113 #ifndef MNT_DETACH |
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114 #define MNT_DETACH 2 |
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115 #endif |
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116 #endif |
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117 |
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118 #endif |
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119 |
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120 #ifdef __MUSL__ |
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121 #include <unistd.h> |
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122 // Without this "rm -r dir" fails with "is directory". |
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123 #define faccessat(A, B, C, D) faccessat(A, B, C, 0) |
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124 #endif |
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125 |
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126 // Work out how to do endianness |
100
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127 |
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128 #ifndef __APPLE__ |
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129 #include <byteswap.h> |
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130 #include <endian.h> |
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131 |
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132 #if __BYTE_ORDER == __BIG_ENDIAN |
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133 #define IS_BIG_ENDIAN 1 |
100
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134 #else |
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135 #define IS_BIG_ENDIAN 0 |
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136 #endif |
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137 |
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Implement Apple and Android versions of getline(), getdelim(), and clearenv().
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138 int clearenv(void); |
100
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139 #else |
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MacOS X has a defective sed with no -r.
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140 |
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141 #ifdef __BIG_ENDIAN__ |
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142 #define IS_BIG_ENDIAN 1 |
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143 #else |
c3d1d74d5d8f
MacOS X has a defective sed with no -r.
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144 #define IS_BIG_ENDIAN 0 |
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MacOS X has a defective sed with no -r.
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145 #endif |
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146 |
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147 #endif |
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148 |
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149 #if IS_BIG_ENDIAN |
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150 #define IS_LITTLE_ENDIAN 0 |
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151 #define SWAP_BE16(x) (x) |
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152 #define SWAP_BE32(x) (x) |
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153 #define SWAP_BE64(x) (x) |
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154 #define SWAP_LE16(x) bswap_16(x) |
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155 #define SWAP_LE32(x) bswap_32(x) |
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156 #define SWAP_LE64(x) bswap_64(x) |
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157 #else |
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158 #define IS_LITTLE_ENDIAN 1 |
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159 #define SWAP_BE16(x) bswap_16(x) |
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160 #define SWAP_BE32(x) bswap_32(x) |
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161 #define SWAP_BE64(x) bswap_64(x) |
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162 #define SWAP_LE16(x) (x) |
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163 #define SWAP_LE32(x) (x) |
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164 #define SWAP_LE64(x) (x) |
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165 #endif |
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Teach build to build only the toys/*.c selected in .config, and teach
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166 |
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167 #if defined(__APPLE__) \ |
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Use compiler built-in macros to determine if argument parsing can use double or float for FLOAT arguments. (I.E. whether double fits in a long's memory.) Check in a way that the macros not being defined just gives us the shorter one.
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168 || (defined(__GLIBC__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 10) |
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169 ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream); |
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170 ssize_t getline(char **lineptr, size_t *n, FILE *stream); |
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171 #endif |
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Compile time probe to fish O_NOFOLLOW out of linux headers when fcntl doesn't conform to posix-2008.
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172 |
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173 // Linux headers not listed by POSIX or LSB |
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174 #include <sys/mount.h> |
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175 #include <sys/swap.h> |
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176 |
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177 // Android is missing some headers and functions |
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178 // "generated/config.h" is included first |
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179 #if CFG_TOYBOX_SHADOW |
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180 #include <shadow.h> |
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181 #endif |
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182 #if CFG_TOYBOX_UTMPX |
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183 #include <utmpx.h> |
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184 #endif |
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185 #if CFG_TOYBOX_PTY |
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186 #include <pty.h> |
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187 #else |
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188 pid_t forkpty(int *amaster, char *name, void *termp, void *winp); |
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189 #endif |
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190 |
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191 |
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192 // Some systems don't define O_NOFOLLOW, and it varies by architecture, so... |
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193 #include <fcntl.h> |
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194 #ifndef O_NOFOLLOW |
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195 #define O_NOFOLLOW 0 |
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196 #endif |
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197 |
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198 #ifndef O_CLOEXEC |
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Patches to commands for issues reported from static analysis tool.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
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199 #define O_CLOEXEC 02000000 |
00c20f410c46
Patches to commands for issues reported from static analysis tool.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
1395
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changeset
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200 #endif |
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Patches to commands for issues reported from static analysis tool.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
1395
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201 |
1275
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Use compiler built-in macros to determine if argument parsing can use double or float for FLOAT arguments. (I.E. whether double fits in a long's memory.) Check in a way that the macros not being defined just gives us the shorter one.
Rob Landley <rob@landley.net>
parents:
1259
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202 #if defined(__SIZEOF_DOUBLE__) && defined(__SIZEOF_LONG__) \ |
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Use compiler built-in macros to determine if argument parsing can use double or float for FLOAT arguments. (I.E. whether double fits in a long's memory.) Check in a way that the macros not being defined just gives us the shorter one.
Rob Landley <rob@landley.net>
parents:
1259
diff
changeset
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203 && __SIZEOF_DOUBLE__ <= __SIZEOF_LONG__ |
6f18a0845db3
Use compiler built-in macros to determine if argument parsing can use double or float for FLOAT arguments. (I.E. whether double fits in a long's memory.) Check in a way that the macros not being defined just gives us the shorter one.
Rob Landley <rob@landley.net>
parents:
1259
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204 typedef double FLOAT; |
6f18a0845db3
Use compiler built-in macros to determine if argument parsing can use double or float for FLOAT arguments. (I.E. whether double fits in a long's memory.) Check in a way that the macros not being defined just gives us the shorter one.
Rob Landley <rob@landley.net>
parents:
1259
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changeset
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205 #else |
6f18a0845db3
Use compiler built-in macros to determine if argument parsing can use double or float for FLOAT arguments. (I.E. whether double fits in a long's memory.) Check in a way that the macros not being defined just gives us the shorter one.
Rob Landley <rob@landley.net>
parents:
1259
diff
changeset
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206 typedef float FLOAT; |
6f18a0845db3
Use compiler built-in macros to determine if argument parsing can use double or float for FLOAT arguments. (I.E. whether double fits in a long's memory.) Check in a way that the macros not being defined just gives us the shorter one.
Rob Landley <rob@landley.net>
parents:
1259
diff
changeset
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207 #endif |
6f18a0845db3
Use compiler built-in macros to determine if argument parsing can use double or float for FLOAT arguments. (I.E. whether double fits in a long's memory.) Check in a way that the macros not being defined just gives us the shorter one.
Rob Landley <rob@landley.net>
parents:
1259
diff
changeset
|
208 |