annotate lib/portability.h @ 1459:240bd13db413 draft

Work around uClibc brain-damage.
author Rob Landley <rob@landley.net>
date Sat, 06 Sep 2014 13:24:58 -0500
parents 00c20f410c46
children ca340df928bc
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8871e8002812 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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7 // The tendency of gcc to produce stupid warnings continues with
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8 // warn_unused_result, which warns about things like ignoring the return code
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9 // of nice(2) (which is completely useless since -1 is a legitimate return
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10 // value on success and even the man page tells you to use errno instead).
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11
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12 // This makes it stop.
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13
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14 #undef _FORTIFY_SOURCE
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15
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16 // For musl
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17 #define _ALL_SOURCE
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19 // Test for gcc (using compiler builtin #define)
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20
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21 #ifdef __GNUC__
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22 #define noreturn __attribute__((noreturn))
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23 #else
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24 #define noreturn
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25 #endif
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27 // Always use long file support.
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28 #define _FILE_OFFSET_BITS 64
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29
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30 // This isn't in the spec, but it's how we determine what libc we're using.
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32 #include <features.h>
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33
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34 // Various constants old build environments might not have even if kernel does
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36 #ifndef AT_FDCWD
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37 #define AT_FDCWD -100
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38 #endif
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40 #ifndef AT_SYMLINK_NOFOLLOW
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41 #define AT_SYMLINK_NOFOLLOW 0x100
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42 #endif
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44 #ifndef AT_REMOVEDIR
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45 #define AT_REMOVEDIR 0x200
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46 #endif
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47
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48 // We don't define GNU_dammit because we're not part of the gnu project, and
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49 // don't want to get any FSF on us. Unfortunately glibc (gnu libc)
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50 // won't give us Linux syscall wrappers without claiming to be part of the
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51 // gnu project (because Stallman's "GNU owns Linux" revisionist history
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52 // crusade includes the kernel, even though Linux was inspired by Minix).
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53
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54 // We use most non-posix Linux syscalls directly through the syscall() wrapper,
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55 // but even many posix-2008 functions aren't provided by glibc unless you
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56 // claim it's in the name of Gnu.
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57
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58 #if defined(__GLIBC__)
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59 // "Function prototypes shall be provided." but aren't.
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60 // http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/unistd.h.html
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61 char *crypt(const char *key, const char *salt);
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62
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63 // According to posix, #include header, get a function definition. But glibc...
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64 // http://pubs.opengroup.org/onlinepubs/9699919799/functions/wcwidth.html
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65 #include <wchar.h>
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66 int wcwidth(wchar_t wc);
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67
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68 // see http://pubs.opengroup.org/onlinepubs/9699919799/functions/strptime.html
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69 #include <time.h>
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70 char *strptime(const char *buf, const char *format, struct tm *tm);
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71
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72 // uClibc pretends to be glibc and copied a lot of its bugs, but has a few more
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73 #if defined(__UCLIBC__)
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74 #include <unistd.h>
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75 #include <stdio.h>
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76 ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream);
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78 // uClibc's last-ever release was in 2012, so of course it doesn't define
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79 // any flag newer than MS_MOVE, which was added in 2001 (linux 2.5.0.5),
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80 // eleven years earlier.
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81
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82 #define MS_MOVE (1<<13)
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83 #define MS_REC (1<<14)
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84 #define MS_SILENT (1<<15)
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85 #define MS_UNBINDABLE (1<<17)
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86 #define MS_PRIVATE (1<<18)
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87 #define MS_SLAVE (1<<19)
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88 #define MS_SHARED (1<<20)
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89
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90 // When building under obsolete glibc (Ubuntu 8.04-ish), hold its hand a bit.
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91 #elif __GLIBC__ == 2 && __GLIBC_MINOR__ < 10
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92 #define fstatat fstatat64
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93 int fstatat64(int dirfd, const char *pathname, void *buf, int flags);
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94 int readlinkat(int dirfd, const char *pathname, char *buf, size_t bufsiz);
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95 char *stpcpy(char *dest, const char *src);
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96 #include <sys/stat.h>
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97 int fchmodat(int dirfd, const char *pathname, mode_t mode, int flags);
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98 int openat(int dirfd, const char *pathname, int flags, ...);
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99 #include <dirent.h>
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100 DIR *fdopendir(int fd);
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101 #include <unistd.h>
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102 int fchownat(int dirfd, const char *pathname,
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103 uid_t owner, gid_t group, int flags);
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104 int isblank(int c);
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105 int unlinkat(int dirfd, const char *pathname, int flags);
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106 #include <stdio.h>
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107 ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream);
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108
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109 // Straight from posix-2008, things old glibc had but didn't prototype
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110
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111 int faccessat(int fd, const char *path, int amode, int flag);
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112 int linkat(int fd1, const char *path1, int fd2, const char *path2, int flag);
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113 int mkdirat(int fd, const char *path, mode_t mode);
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114 int symlinkat(const char *path1, int fd, const char *path2);
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115 int mknodat(int fd, const char *path, mode_t mode, dev_t dev);
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116 #include <sys/time.h>
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117 int futimens(int fd, const struct timespec times[2]);
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118 int utimensat(int fd, const char *path, const struct timespec times[2], int flag);
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119
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120 #ifndef MNT_DETACH
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121 #define MNT_DETACH 2
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122 #endif
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123 #endif
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124
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125 #endif
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126
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127 // Work out how to do endianness
100
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128
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129 #ifndef __APPLE__
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130 #include <byteswap.h>
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131 #include <endian.h>
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132
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133 #if __BYTE_ORDER == __BIG_ENDIAN
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134 #define IS_BIG_ENDIAN 1
100
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135 #else
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136 #define IS_BIG_ENDIAN 0
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137 #endif
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138
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139 int clearenv(void);
100
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140 #else
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141
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142 #ifdef __BIG_ENDIAN__
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143 #define IS_BIG_ENDIAN 1
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144 #else
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145 #define IS_BIG_ENDIAN 0
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146 #endif
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147
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148 #endif
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149
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150 #if IS_BIG_ENDIAN
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151 #define IS_LITTLE_ENDIAN 0
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152 #define SWAP_BE16(x) (x)
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153 #define SWAP_BE32(x) (x)
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154 #define SWAP_BE64(x) (x)
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155 #define SWAP_LE16(x) bswap_16(x)
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156 #define SWAP_LE32(x) bswap_32(x)
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157 #define SWAP_LE64(x) bswap_64(x)
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158 #else
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159 #define IS_LITTLE_ENDIAN 1
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160 #define SWAP_BE16(x) bswap_16(x)
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161 #define SWAP_BE32(x) bswap_32(x)
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162 #define SWAP_BE64(x) bswap_64(x)
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163 #define SWAP_LE16(x) (x)
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164 #define SWAP_LE32(x) (x)
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165 #define SWAP_LE64(x) (x)
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166 #endif
94
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167
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168 #if defined(__APPLE__) || defined(__ANDROID__) \
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169 || (defined(__GLIBC__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 10)
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170 ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream);
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171 ssize_t getline(char **lineptr, size_t *n, FILE *stream);
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172 #endif
813
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173
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174 // Linux headers not listed by POSIX or LSB
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175 #include <shadow.h>
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176 #include <sys/mount.h>
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177 #include <sys/swap.h>
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178
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179 // Some systems don't define O_NOFOLLOW, and it varies by architecture, so...
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180 #include <fcntl.h>
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181 #ifndef O_NOFOLLOW
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182 #define O_NOFOLLOW 0
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183 #endif
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184
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185 #ifndef O_CLOEXEC
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186 #define O_CLOEXEC 02000000
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187 #endif
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188
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189 #if defined(__SIZEOF_DOUBLE__) && defined(__SIZEOF_LONG__) \
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190 && __SIZEOF_DOUBLE__ <= __SIZEOF_LONG__
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191 typedef double FLOAT;
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192 #else
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193 typedef float FLOAT;
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194 #endif
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195