annotate lib/portability.h @ 800:4ffb735aea59

More support for old (~2008) build environments, move the #ifdef checks for symbols out of specific library version checks (shouldn't hurt anything), remove obsolete debug macro.
author Rob Landley <rob@landley.net>
date Mon, 04 Feb 2013 08:07:32 -0600
parents 9a6b08e7fe94
children bbec26ccb40c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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.
Rob Landley <rob@landley.net>
parents: 600
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1 // Workarounds for horrible build environment idiosyncrasies.
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.
Rob Landley <rob@landley.net>
parents: 600
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2 // Instead of polluting the code with strange #ifdefs to work around bugs
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.
Rob Landley <rob@landley.net>
parents: 600
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3 // in specific compiler, library, or OS versions, localize all that here
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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4 // and in portability.c
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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5
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9051cb744d0a Shut up even MORE gcc/glibc spurious warnings.
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6 // 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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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).
9051cb744d0a Shut up even MORE gcc/glibc spurious warnings.
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10
9051cb744d0a Shut up even MORE gcc/glibc spurious warnings.
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11 // This makes it stop.
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12
9051cb744d0a Shut up even MORE gcc/glibc spurious warnings.
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13 #undef _FORTIFY_SOURCE
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14
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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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15 // Always use long file support.
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31215cc6c9f2 Consolidate headers.
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16 #define _FILE_OFFSET_BITS 64
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17
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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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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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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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20 #include <features.h>
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21
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4ffb735aea59 More support for old (~2008) build environments, move the #ifdef checks for symbols out of specific library version checks (shouldn't hurt anything), remove obsolete debug macro.
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parents: 789
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22 // Various constants old build environments might not have even if kernel does
4ffb735aea59 More support for old (~2008) build environments, move the #ifdef checks for symbols out of specific library version checks (shouldn't hurt anything), remove obsolete debug macro.
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parents: 789
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23
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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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24 #ifndef O_DIRECTORY
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25 #define O_DIRECTORY 0200000
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26 #endif
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28 #ifndef O_NOFOLLOW
4ffb735aea59 More support for old (~2008) build environments, move the #ifdef checks for symbols out of specific library version checks (shouldn't hurt anything), remove obsolete debug macro.
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29 #define O_NOFOLLOW 0400000
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parents: 789
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30 #endif
4ffb735aea59 More support for old (~2008) build environments, move the #ifdef checks for symbols out of specific library version checks (shouldn't hurt anything), remove obsolete debug macro.
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31
4ffb735aea59 More support for old (~2008) build environments, move the #ifdef checks for symbols out of specific library version checks (shouldn't hurt anything), remove obsolete debug macro.
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32 #ifndef AT_FDCWD
4ffb735aea59 More support for old (~2008) build environments, move the #ifdef checks for symbols out of specific library version checks (shouldn't hurt anything), remove obsolete debug macro.
Rob Landley <rob@landley.net>
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33 #define AT_FDCWD -100
4ffb735aea59 More support for old (~2008) build environments, move the #ifdef checks for symbols out of specific library version checks (shouldn't hurt anything), remove obsolete debug macro.
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parents: 789
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34 #endif
4ffb735aea59 More support for old (~2008) build environments, move the #ifdef checks for symbols out of specific library version checks (shouldn't hurt anything), remove obsolete debug macro.
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parents: 789
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35
4ffb735aea59 More support for old (~2008) build environments, move the #ifdef checks for symbols out of specific library version checks (shouldn't hurt anything), remove obsolete debug macro.
Rob Landley <rob@landley.net>
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36 #ifndef AT_SYMLINK_NOFOLLOW
4ffb735aea59 More support for old (~2008) build environments, move the #ifdef checks for symbols out of specific library version checks (shouldn't hurt anything), remove obsolete debug macro.
Rob Landley <rob@landley.net>
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37 #define AT_SYMLINK_NOFOLLOW 0x100
4ffb735aea59 More support for old (~2008) build environments, move the #ifdef checks for symbols out of specific library version checks (shouldn't hurt anything), remove obsolete debug macro.
Rob Landley <rob@landley.net>
parents: 789
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38 #endif
4ffb735aea59 More support for old (~2008) build environments, move the #ifdef checks for symbols out of specific library version checks (shouldn't hurt anything), remove obsolete debug macro.
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parents: 789
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39
4ffb735aea59 More support for old (~2008) build environments, move the #ifdef checks for symbols out of specific library version checks (shouldn't hurt anything), remove obsolete debug macro.
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40 #ifndef AT_REMOVEDIR
4ffb735aea59 More support for old (~2008) build environments, move the #ifdef checks for symbols out of specific library version checks (shouldn't hurt anything), remove obsolete debug macro.
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41 #define AT_REMOVEDIR 0x200
4ffb735aea59 More support for old (~2008) build environments, move the #ifdef checks for symbols out of specific library version checks (shouldn't hurt anything), remove obsolete debug macro.
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parents: 789
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42 #endif
4ffb735aea59 More support for old (~2008) build environments, move the #ifdef checks for symbols out of specific library version checks (shouldn't hurt anything), remove obsolete debug macro.
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43
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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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44 #if defined(__GLIBC__)
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45 // "Function prototypes shall be provided." but aren't.
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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46 // http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/unistd.h.html
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47 char *crypt(const char *key, const char *salt);
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48
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b2194045c40e Remove "feature test macros", replace non-portable fdprintf() with standard fprintf().
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49 // An SUSv4 function that glibc refuses to #define without crazy #defines,
b2194045c40e Remove "feature test macros", replace non-portable fdprintf() with standard fprintf().
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50 // see http://pubs.opengroup.org/onlinepubs/9699919799/functions/strptime.html
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51 #include <time.h>
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52 char *strptime(const char *buf, const char *format, struct tm *tm);
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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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parents: 702
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53
ff8a27d3ab8f The headers of uClibc and older glibc got unhappy with O_DIRECTORY and some other stuff. Fix it up in portability.h.
Rob Landley <rob@landley.net>
parents: 702
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54 // uClibc pretends to be glibc and copied a lot of its bugs, but has a few more
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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parents: 702
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55 #if defined(__UCLIBC__)
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parents: 702
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56 #include <unistd.h>
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57 #include <stdio.h>
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58 ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream);
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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.
Rob Landley <rob@landley.net>
parents: 600
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59
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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60 // When building under obsolete glibc, hold its hand a bit.
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61 #elif __GLIBC__ == 2 && __GLIBC_MINOR__ < 10
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fb17cd078e63 Fix ancient glibc workaround to force fstatat64
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62 #define fstatat fstatat64
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63 int fstatat64(int dirfd, const char *pathname, void *buf, int flags);
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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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parents: 600
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64 int readlinkat(int dirfd, const char *pathname, char *buf, size_t bufsiz);
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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65 char *stpcpy(char *dest, const char *src);
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.
Rob Landley <rob@landley.net>
parents: 600
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66 #include <sys/stat.h>
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.
Rob Landley <rob@landley.net>
parents: 600
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67 int fchmodat(int dirfd, const char *pathname, mode_t mode, int flags);
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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68 int openat(int dirfd, const char *pathname, int flags, ...);
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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69 #include <dirent.h>
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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70 DIR *fdopendir(int fd);
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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71 #include <unistd.h>
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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72 int fchownat(int dirfd, const char *pathname,
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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73 uid_t owner, gid_t group, int flags);
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.
Rob Landley <rob@landley.net>
parents: 600
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74 int isblank(int c);
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.
Rob Landley <rob@landley.net>
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75 int unlinkat(int dirfd, const char *pathname, int flags);
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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76 #include <stdio.h>
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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77 ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream);
800
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78
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79 // Straight from posix-2008, things old glibc didn't define
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80
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81 int faccessat(int fd, const char *path, int amode, int flag);
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82 int linkat(int fd1, const char *path1, int fd2, const char *path2, int flag);
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83 int mkdirat(int fd, const char *path, mode_t mode);
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84 int symlinkat(const char *path1, int fd, const char *path2);
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85 int mknodat(int fd, const char *path, mode_t mode, dev_t dev);
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86 #include <sys/time.h>
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87 int futimens(int fd, const struct timespec times[2]);
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88 int utimensat(int fd, const char *path, const struct timespec times[2], int flag);
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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89 #endif
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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90
550
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91 #endif
63
69efffcacd70 Add fdprintf(). Remove reread() and rewrite() which handle -EINTR, which
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92
800
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93 // Test for gcc
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94
166
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95 #ifdef __GNUC__
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96 #define noreturn __attribute__((noreturn))
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97 #else
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98 #define noreturn
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99 #endif
100
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100
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101 #ifndef __APPLE__
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102 #include <byteswap.h>
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103 #include <endian.h>
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104
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105 #if __BYTE_ORDER == __BIG_ENDIAN
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106 #define IS_BIG_ENDIAN 1
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107 #else
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108 #define IS_BIG_ENDIAN 0
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109 #endif
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110
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111 int clearenv(void);
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112 #else
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113
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114 #ifdef __BIG_ENDIAN__
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115 #define IS_BIG_ENDIAN 1
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116 #else
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117 #define IS_BIG_ENDIAN 0
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118 #endif
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119
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120 #endif
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121
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122 #if IS_BIG_ENDIAN
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123 #define IS_LITTLE_ENDIAN 0
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124 #define SWAP_BE16(x) (x)
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125 #define SWAP_BE32(x) (x)
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126 #define SWAP_BE64(x) (x)
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127 #define SWAP_LE16(x) bswap_16(x)
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128 #define SWAP_LE32(x) bswap_32(x)
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129 #define SWAP_LE64(x) bswap_64(x)
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130 #else
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131 #define IS_LITTLE_ENDIAN 1
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132 #define SWAP_BE16(x) bswap_16(x)
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133 #define SWAP_BE32(x) bswap_32(x)
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134 #define SWAP_BE64(x) bswap_64(x)
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135 #define SWAP_LE16(x) (x)
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136 #define SWAP_LE32(x) (x)
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137 #define SWAP_LE64(x) (x)
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138 #endif
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139
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140 #if defined(__APPLE__) || defined(__ANDROID__)
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141 ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream);
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142 ssize_t getline(char **lineptr, size_t *n, FILE *stream);
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143 #endif