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annotate lib/portability.h @ 983:c38c25282b88

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author Rob Landley <rob@landley.net>
date Thu, 01 Aug 2013 17:21:38 -0500
parents 52e69f6710ca
children 3570984a1015
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
691
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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parents: 600
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1 // Workarounds for horrible build environment idiosyncrasies.
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Rob Landley <rob@landley.net>
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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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1f5bd8c93093 Implement Apple and Android versions of getline(), getdelim(), and clearenv().
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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
9051cb744d0a Shut up even MORE gcc/glibc spurious warnings.
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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 // Test for gcc (using compiler builtin #define)
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17
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18 #ifdef __GNUC__
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19 #define noreturn __attribute__((noreturn))
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20 #else
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21 #define noreturn
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22 #endif
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23
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24 // Always use long file support.
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25 #define _FILE_OFFSET_BITS 64
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26
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27 // This isn't in the spec, but it's how we determine what libc we're using.
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28
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58d2fd7484bd 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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29 #include <features.h>
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30
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31 // Various constants old build environments might not have even if kernel does
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32
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33 #ifndef AT_FDCWD
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34 #define AT_FDCWD -100
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35 #endif
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36
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37 #ifndef AT_SYMLINK_NOFOLLOW
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38 #define AT_SYMLINK_NOFOLLOW 0x100
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39 #endif
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40
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41 #ifndef AT_REMOVEDIR
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42 #define AT_REMOVEDIR 0x200
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43 #endif
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44
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45 // We don't define GNU_dammit because we're not part of the gnu project, and
bbec26ccb40c Comment updates and a policy statement about avoiding #define GNU_dammit
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46 // don't want to get any FSF on us. Unfortunately glibc (gnu libc)
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47 // won't give us Linux syscall wrappers without claiming to be part of the
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48 // gnu project (because Stallman's "GNU owns Linux" revisionist history
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49 // crusade includes the kernel, even though Linux was inspired by Minix).
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50
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51 // We use most non-posix Linux syscalls directly through the syscall() wrapper,
bbec26ccb40c Comment updates and a policy statement about avoiding #define GNU_dammit
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52 // but even many posix-2008 functions aren't provided by glibc unless you
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53 // claim it's in the name of Gnu.
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54
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55 #if defined(__GLIBC__)
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56 // "Function prototypes shall be provided." but aren't.
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57 // http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/unistd.h.html
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58 char *crypt(const char *key, const char *salt);
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59
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60 // see http://pubs.opengroup.org/onlinepubs/9699919799/functions/strptime.html
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61 #include <time.h>
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62 char *strptime(const char *buf, const char *format, struct tm *tm);
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64 // uClibc pretends to be glibc and copied a lot of its bugs, but has a few more
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65 #if defined(__UCLIBC__)
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66 #include <unistd.h>
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67 #include <stdio.h>
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68 ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream);
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69
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70 // When building under obsolete glibc (Ubuntu 8.04-ish), hold its hand a bit.
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71 #elif __GLIBC__ == 2 && __GLIBC_MINOR__ < 10
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72 #define fstatat fstatat64
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73 int fstatat64(int dirfd, const char *pathname, void *buf, int flags);
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74 int readlinkat(int dirfd, const char *pathname, char *buf, size_t bufsiz);
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75 char *stpcpy(char *dest, const char *src);
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76 #include <sys/stat.h>
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77 int fchmodat(int dirfd, const char *pathname, mode_t mode, int flags);
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78 int openat(int dirfd, const char *pathname, int flags, ...);
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79 #include <dirent.h>
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80 DIR *fdopendir(int fd);
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81 #include <unistd.h>
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82 int fchownat(int dirfd, const char *pathname,
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83 uid_t owner, gid_t group, int flags);
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84 int isblank(int c);
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85 int unlinkat(int dirfd, const char *pathname, int flags);
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86 #include <stdio.h>
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87 ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream);
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88
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89 // Straight from posix-2008, things old glibc had but didn't prototype
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90
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91 int faccessat(int fd, const char *path, int amode, int flag);
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92 int linkat(int fd1, const char *path1, int fd2, const char *path2, int flag);
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93 int mkdirat(int fd, const char *path, mode_t mode);
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94 int symlinkat(const char *path1, int fd, const char *path2);
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95 int mknodat(int fd, const char *path, mode_t mode, dev_t dev);
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96 #include <sys/time.h>
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97 int futimens(int fd, const struct timespec times[2]);
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98 int utimensat(int fd, const char *path, const struct timespec times[2], int flag);
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99 #endif
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100
550
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101 #endif
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102
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103 // Work out how to do endianness
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104
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105 #ifndef __APPLE__
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106 #include <byteswap.h>
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107 #include <endian.h>
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108
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109 #if __BYTE_ORDER == __BIG_ENDIAN
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110 #define IS_BIG_ENDIAN 1
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111 #else
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112 #define IS_BIG_ENDIAN 0
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113 #endif
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114
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115 int clearenv(void);
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116 #else
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117
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118 #ifdef __BIG_ENDIAN__
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119 #define IS_BIG_ENDIAN 1
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120 #else
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121 #define IS_BIG_ENDIAN 0
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122 #endif
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123
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124 #endif
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125
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126 #if IS_BIG_ENDIAN
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127 #define IS_LITTLE_ENDIAN 0
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128 #define SWAP_BE16(x) (x)
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129 #define SWAP_BE32(x) (x)
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130 #define SWAP_BE64(x) (x)
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131 #define SWAP_LE16(x) bswap_16(x)
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132 #define SWAP_LE32(x) bswap_32(x)
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133 #define SWAP_LE64(x) bswap_64(x)
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134 #else
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135 #define IS_LITTLE_ENDIAN 1
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136 #define SWAP_BE16(x) bswap_16(x)
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137 #define SWAP_BE32(x) bswap_32(x)
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138 #define SWAP_BE64(x) bswap_64(x)
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139 #define SWAP_LE16(x) (x)
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140 #define SWAP_LE32(x) (x)
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141 #define SWAP_LE64(x) (x)
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142 #endif
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143
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144 #if defined(__APPLE__) || defined(__ANDROID__)
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145 ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream);
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146 ssize_t getline(char **lineptr, size_t *n, FILE *stream);
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147 #endif
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148
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149 #include "generated/portability.h"