annotate lib/portability.h @ 713:ff8a27d3ab8f

The headers of uClibc and older glibc got unhappy with O_DIRECTORY and some other stuff. Fix it up in portability.h.
author Rob Landley <rob@landley.net>
date Mon, 26 Nov 2012 23:24:07 -0600
parents 9fb5fe6eb13f
children fb17cd078e63
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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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2 // Instead of polluting the code with strange #ifdefs to work around bugs
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3 // in specific compiler, library, or OS versions, localize all that here
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4 // and in portability.c
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5
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6 // The tendency of gcc to produce stupid warnings continues with
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7 // warn_unused_result, which warns about things like ignoring the return code
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8 // of nice(2) (which is completely useless since -1 is a legitimate return
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9 // value on success and even the man page tells you to use errno instead).
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10
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11 // This makes it stop.
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12
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13 #undef _FORTIFY_SOURCE
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14
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15 // Always use long file support.
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16 #define _FILE_OFFSET_BITS 64
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17
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18 // This isn't in the spec, but it's how we determine what we're using.
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19
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20 #include <features.h>
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21
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22 #ifndef O_DIRECTORY
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23 #define O_DIRECTORY 0200000
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24 #endif
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25
ff8a27d3ab8f The headers of uClibc and older glibc got unhappy with O_DIRECTORY and some other stuff. Fix it up in portability.h.
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26 #if defined(__GLIBC__)
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27 // "Function prototypes shall be provided." but aren't.
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28 // http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/unistd.h.html
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29 char *crypt(const char *key, const char *salt);
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30
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31 // An SUSv4 function that glibc refuses to #define without crazy #defines,
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32 // see http://pubs.opengroup.org/onlinepubs/9699919799/functions/strptime.html
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33 #include <time.h>
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34 char *strptime(const char *buf, const char *format, struct tm *tm);
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35
ff8a27d3ab8f The headers of uClibc and older glibc got unhappy with O_DIRECTORY and some other stuff. Fix it up in portability.h.
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36 // uClibc pretends to be glibc and copied a lot of its bugs, but has a few more
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37 #if defined(__UCLIBC__)
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38 #include <unistd.h>
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39 #include <stdio.h>
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40 ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream);
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parents: 600
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41
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42 // When building under obsolete glibc, hold its hand a bit.
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43 #elif __GLIBC_MINOR__ < 10
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44 #define AT_FDCWD -100
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45 #define AT_SYMLINK_NOFOLLOW 0x100
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46 #define AT_REMOVEDIR 0x200
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47 int fstatat(int dirfd, const char *pathname, void *buf, int flags);
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48 int readlinkat(int dirfd, const char *pathname, char *buf, size_t bufsiz);
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49 char *stpcpy(char *dest, const char *src);
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50 #include <sys/stat.h>
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51 int fchmodat(int dirfd, const char *pathname, mode_t mode, int flags);
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52 int openat(int dirfd, const char *pathname, int flags, ...);
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53 #include <dirent.h>
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54 DIR *fdopendir(int fd);
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55 #include <unistd.h>
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56 int fchownat(int dirfd, const char *pathname,
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57 uid_t owner, gid_t group, int flags);
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58 int isblank(int c);
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59 int unlinkat(int dirfd, const char *pathname, int flags);
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60 #include <stdio.h>
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61 ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream);
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62 #endif
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63
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64 #endif
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65
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66 #ifdef __GNUC__
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67 #define noreturn __attribute__((noreturn))
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68 #else
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69 #define noreturn
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70 #endif
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71
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72 #ifndef __APPLE__
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73 #include <byteswap.h>
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74 #include <endian.h>
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75
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76 #if __BYTE_ORDER == __BIG_ENDIAN
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77 #define IS_BIG_ENDIAN 1
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78 #else
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79 #define IS_BIG_ENDIAN 0
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80 #endif
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81
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82 int clearenv(void);
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83 #else
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84
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85 #ifdef __BIG_ENDIAN__
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86 #define IS_BIG_ENDIAN 1
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87 #else
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88 #define IS_BIG_ENDIAN 0
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89 #endif
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90
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91 #endif
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92
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93 #if IS_BIG_ENDIAN
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94 #define IS_LITTLE_ENDIAN 0
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95 #define SWAP_BE16(x) (x)
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96 #define SWAP_BE32(x) (x)
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97 #define SWAP_BE64(x) (x)
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98 #define SWAP_LE16(x) bswap_16(x)
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99 #define SWAP_LE32(x) bswap_32(x)
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100 #define SWAP_LE64(x) bswap_64(x)
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101 #else
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102 #define IS_LITTLE_ENDIAN 1
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103 #define SWAP_BE16(x) bswap_16(x)
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104 #define SWAP_BE32(x) bswap_32(x)
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105 #define SWAP_BE64(x) bswap_64(x)
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106 #define SWAP_LE16(x) (x)
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107 #define SWAP_LE32(x) (x)
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108 #define SWAP_LE64(x) (x)
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109 #endif
94
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110
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111 // Some versions of gcc produce spurious "may be uninitialized" warnings in
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112 // cases where it provably can't happen. Unfortunately, although this warning
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113 // is calculated and produced separately from the "is definitely used
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114 // uninitialized" warnings, there's no way to turn off the broken spurious "may
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115 // be" warnings without also turning off the non-broken "is" warnings.
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116
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117 #if CFG_TOYBOX_DEBUG
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118 #define GCC_BUG =0
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119 #else
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120 #define GCC_BUG
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121 #endif
549
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122
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123 #if defined(__APPLE__) || defined(__ANDROID__)
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124 ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream);
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125 ssize_t getline(char **lineptr, size_t *n, FILE *stream);
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126 #endif