Mercurial > hg > toybox
annotate lib/portability.h @ 1278:324306321d82 draft
Initial cleanup of last: mostly whitespace, move no record test to start of loop, don't bother to stat an empty file to report when an empty log was created (just report current time).
author | Rob Landley <rob@landley.net> |
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date | Sat, 10 May 2014 13:20:03 -0500 |
parents | 6f18a0845db3 |
children | 5149632b0d07 |
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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2 |
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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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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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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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16 // For musl |
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17 #define _ALL_SOURCE |
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18 |
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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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26 |
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27 // Always use long file support. |
533 | 28 #define _FILE_OFFSET_BITS 64 |
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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31 |
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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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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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35 |
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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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39 |
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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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43 |
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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 // see http://pubs.opengroup.org/onlinepubs/9699919799/functions/strptime.html |
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64 #include <time.h> |
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65 char *strptime(const char *buf, const char *format, struct tm *tm); |
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66 |
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67 // uClibc pretends to be glibc and copied a lot of its bugs, but has a few more |
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68 #if defined(__UCLIBC__) |
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69 #include <unistd.h> |
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70 #include <stdio.h> |
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71 ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream); |
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72 |
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73 // When building under obsolete glibc (Ubuntu 8.04-ish), hold its hand a bit. |
800
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74 #elif __GLIBC__ == 2 && __GLIBC_MINOR__ < 10 |
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75 #define fstatat fstatat64 |
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76 int fstatat64(int dirfd, const char *pathname, void *buf, int flags); |
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77 int readlinkat(int dirfd, const char *pathname, char *buf, size_t bufsiz); |
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78 char *stpcpy(char *dest, const char *src); |
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79 #include <sys/stat.h> |
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80 int fchmodat(int dirfd, const char *pathname, mode_t mode, int flags); |
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81 int openat(int dirfd, const char *pathname, int flags, ...); |
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82 #include <dirent.h> |
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83 DIR *fdopendir(int fd); |
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84 #include <unistd.h> |
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85 int fchownat(int dirfd, const char *pathname, |
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86 uid_t owner, gid_t group, int flags); |
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87 int isblank(int c); |
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88 int unlinkat(int dirfd, const char *pathname, int flags); |
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89 #include <stdio.h> |
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90 ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream); |
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91 |
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92 // Straight from posix-2008, things old glibc had but didn't prototype |
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93 |
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94 int faccessat(int fd, const char *path, int amode, int flag); |
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95 int linkat(int fd1, const char *path1, int fd2, const char *path2, int flag); |
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96 int mkdirat(int fd, const char *path, mode_t mode); |
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97 int symlinkat(const char *path1, int fd, const char *path2); |
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98 int mknodat(int fd, const char *path, mode_t mode, dev_t dev); |
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99 #include <sys/time.h> |
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100 int futimens(int fd, const struct timespec times[2]); |
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101 int utimensat(int fd, const char *path, const struct timespec times[2], int flag); |
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102 |
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103 #ifndef MNT_DETACH |
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104 #define MNT_DETACH 2 |
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105 #endif |
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106 #endif |
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107 |
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108 #endif |
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109 |
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110 // Work out how to do endianness |
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111 |
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112 #ifndef __APPLE__ |
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113 #include <byteswap.h> |
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114 #include <endian.h> |
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115 |
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116 #if __BYTE_ORDER == __BIG_ENDIAN |
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117 #define IS_BIG_ENDIAN 1 |
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118 #else |
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119 #define IS_BIG_ENDIAN 0 |
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120 #endif |
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121 |
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122 int clearenv(void); |
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123 #else |
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124 |
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125 #ifdef __BIG_ENDIAN__ |
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126 #define IS_BIG_ENDIAN 1 |
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127 #else |
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128 #define IS_BIG_ENDIAN 0 |
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129 #endif |
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130 |
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131 #endif |
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132 |
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133 #if IS_BIG_ENDIAN |
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134 #define IS_LITTLE_ENDIAN 0 |
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135 #define SWAP_BE16(x) (x) |
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136 #define SWAP_BE32(x) (x) |
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137 #define SWAP_BE64(x) (x) |
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138 #define SWAP_LE16(x) bswap_16(x) |
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139 #define SWAP_LE32(x) bswap_32(x) |
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140 #define SWAP_LE64(x) bswap_64(x) |
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141 #else |
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142 #define IS_LITTLE_ENDIAN 1 |
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143 #define SWAP_BE16(x) bswap_16(x) |
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144 #define SWAP_BE32(x) bswap_32(x) |
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145 #define SWAP_BE64(x) bswap_64(x) |
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146 #define SWAP_LE16(x) (x) |
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147 #define SWAP_LE32(x) (x) |
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148 #define SWAP_LE64(x) (x) |
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149 #endif |
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150 |
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151 #if defined(__APPLE__) || defined(__ANDROID__) \ |
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152 || (defined(__GLIBC__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 10) |
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153 ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream); |
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154 ssize_t getline(char **lineptr, size_t *n, FILE *stream); |
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155 #endif |
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156 |
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157 // Linux headers not listed by POSIX or LSB |
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158 #include <shadow.h> |
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159 #include <sys/mount.h> |
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160 #include <sys/swap.h> |
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161 |
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162 // Some systems don't define O_NOFOLLOW, and it varies by architecture, so... |
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163 #include <fcntl.h> |
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164 #ifndef O_NOFOLLOW |
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165 #define O_NOFOLLOW 0 |
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166 #endif |
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167 |
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168 #if defined(__SIZEOF_DOUBLE__) && defined(__SIZEOF_LONG__) \ |
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169 && __SIZEOF_DOUBLE__ <= __SIZEOF_LONG__ |
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170 typedef double FLOAT; |
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171 #else |
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172 typedef float FLOAT; |
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173 #endif |
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174 |