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- // Workarounds for horrible build environment idiosyncrasies.
- // Instead of polluting the code with strange #ifdefs to work around bugs
- // in specific compiler, library, or OS versions, localize all that here
- // and in portability.c
- // Always use long file support.
- // This must come before we #include any system header file to take effect!
- #define _FILE_OFFSET_BITS 64
- // For musl
- #define _ALL_SOURCE
- #include <regex.h>
- #ifndef REG_STARTEND
- #define REG_STARTEND 0
- #endif
- #ifdef __APPLE__
- // macOS 10.13 doesn't have the POSIX 2008 direct access to timespec in
- // struct stat, but we can ask it to give us something equivalent...
- // (This must come before any #include!)
- #define _DARWIN_C_SOURCE
- // ...and then use macros to paper over the difference.
- #define st_atim st_atimespec
- #define st_ctim st_ctimespec
- #define st_mtim st_mtimespec
- #endif
- // Test for gcc (using compiler builtin #define)
- #ifdef __GNUC__
- #ifndef __clang__
- #define QUIET = 0 // shut up false positive "may be used uninitialized" warning
- #else
- #define QUIET
- #endif
- #define printf_format __attribute__((format(printf, 1, 2)))
- #else
- #define printf_format
- #endif
- // This isn't in the spec, but it's how we determine what libc we're using.
- // Types various replacement prototypes need.
- // This also lets us determine what libc we're using. Systems that
- // have <features.h> will transitively include it, and ones that don't --
- // macOS -- won't break.
- #include <sys/types.h>
- // Various constants old build environments might not have even if kernel does
- #ifndef AT_FDCWD
- #define AT_FDCWD -100
- #endif
- #ifndef AT_SYMLINK_NOFOLLOW
- #define AT_SYMLINK_NOFOLLOW 0x100
- #endif
- #ifndef AT_REMOVEDIR
- #define AT_REMOVEDIR 0x200
- #endif
- #ifndef RLIMIT_RTTIME
- #define RLIMIT_RTTIME 15
- #endif
- // Introduced in Linux 3.1
- #ifndef SEEK_DATA
- #define SEEK_DATA 3
- #endif
- #ifndef SEEK_HOLE
- #define SEEK_HOLE 4
- #endif
- // We don't define GNU_dammit because we're not part of the gnu project, and
- // don't want to get any FSF on us. Unfortunately glibc (gnu libc)
- // won't give us Linux syscall wrappers without claiming to be part of the
- // gnu project (because Stallman's "GNU owns Linux" revisionist history
- // crusade includes the kernel, even though Linux was inspired by Minix).
- // We use most non-posix Linux syscalls directly through the syscall() wrapper,
- // but even many posix-2008 functions aren't provided by glibc unless you
- // claim it's in the name of Gnu.
- #if defined(__GLIBC__)
- // "Function prototypes shall be provided." but aren't.
- // http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/unistd.h.html
- char *crypt(const char *key, const char *salt);
- // According to posix, #include header, get a function definition. But glibc...
- // http://pubs.opengroup.org/onlinepubs/9699919799/functions/wcwidth.html
- #include <wchar.h>
- int wcwidth(wchar_t wc);
- // see http://pubs.opengroup.org/onlinepubs/9699919799/functions/strptime.html
- #include <time.h>
- char *strptime(const char *buf, const char *format, struct tm *tm);
- // They didn't like posix basename so they defined another function with the
- // same name and if you include libgen.h it #defines basename to something
- // else (where they implemented the real basename), and that define breaks
- // the table entry for the basename command. They didn't make a new function
- // with a different name for their new behavior because gnu.
- //
- // Solution: don't use their broken header, provide an inline to redirect the
- // correct name to the broken name.
- char *dirname(char *path);
- char *__xpg_basename(char *path);
- static inline char *basename(char *path) { return __xpg_basename(path); }
- char *strcasestr(const char *haystack, const char *needle);
- void *memmem(const void *haystack, size_t haystack_length,
- const void *needle, size_t needle_length);
- #endif // defined(glibc)
- // getopt_long(), getopt_long_only(), and struct option.
- #include <getopt.h>
- #if !defined(__GLIBC__)
- // POSIX basename.
- #include <libgen.h>
- #endif
- // Work out how to do endianness
- #ifdef __APPLE__
- #include <libkern/OSByteOrder.h>
- #ifdef __BIG_ENDIAN__
- #define IS_BIG_ENDIAN 1
- #else
- #define IS_BIG_ENDIAN 0
- #endif
- #define bswap_16(x) OSSwapInt16(x)
- #define bswap_32(x) OSSwapInt32(x)
- #define bswap_64(x) OSSwapInt64(x)
- #elif defined(__FreeBSD__) || defined(__OpenBSD__)
- #include <sys/endian.h>
- #if _BYTE_ORDER == _BIG_ENDIAN
- #define IS_BIG_ENDIAN 1
- #else
- #define IS_BIG_ENDIAN 0
- #endif
- #else
- #include <byteswap.h>
- #include <endian.h>
- #if __BYTE_ORDER == __BIG_ENDIAN
- #define IS_BIG_ENDIAN 1
- #else
- #define IS_BIG_ENDIAN 0
- #endif
- #endif
- #if IS_BIG_ENDIAN
- #define IS_LITTLE_ENDIAN 0
- #define SWAP_BE16(x) (x)
- #define SWAP_BE32(x) (x)
- #define SWAP_BE64(x) (x)
- #define SWAP_LE16(x) bswap_16(x)
- #define SWAP_LE32(x) bswap_32(x)
- #define SWAP_LE64(x) bswap_64(x)
- #else
- #define IS_LITTLE_ENDIAN 1
- #define SWAP_BE16(x) bswap_16(x)
- #define SWAP_BE32(x) bswap_32(x)
- #define SWAP_BE64(x) bswap_64(x)
- #define SWAP_LE16(x) (x)
- #define SWAP_LE32(x) (x)
- #define SWAP_LE64(x) (x)
- #endif
- // Linux headers not listed by POSIX or LSB
- #include <sys/mount.h>
- #ifdef __linux__
- #include <sys/statfs.h>
- #include <sys/swap.h>
- #include <sys/sysinfo.h>
- #endif
- #ifdef __APPLE__
- #include <util.h>
- #elif !defined(__FreeBSD__) && !defined(__OpenBSD__)
- #include <pty.h>
- #else
- #include <termios.h>
- #ifndef IUTF8
- #define IUTF8 0
- #endif
- #endif
- #ifdef __linux__
- #include <sys/personality.h>
- #else
- #define PER_LINUX32 0
- int personality(int);
- #endif
- #if defined(__APPLE__) || defined(__linux__)
- // Linux and macOS has both have getxattr and friends in <sys/xattr.h>, but
- // they aren't compatible.
- #include <sys/xattr.h>
- ssize_t xattr_get(const char *, const char *, void *, size_t);
- ssize_t xattr_lget(const char *, const char *, void *, size_t);
- ssize_t xattr_fget(int fd, const char *, void *, size_t);
- ssize_t xattr_list(const char *, char *, size_t);
- ssize_t xattr_llist(const char *, char *, size_t);
- ssize_t xattr_flist(int, char *, size_t);
- ssize_t xattr_set(const char*, const char*, const void*, size_t, int);
- ssize_t xattr_lset(const char*, const char*, const void*, size_t, int);
- ssize_t xattr_fset(int, const char*, const void*, size_t, int);
- #endif
- #if defined(__APPLE__)
- // macOS doesn't have these functions, but we can fake them.
- int mknodat(int, const char*, mode_t, dev_t);
- int posix_fallocate(int, off_t, off_t);
- // macOS keeps newlocale(3) in the non-POSIX <xlocale.h> rather than <locale.h>.
- #include <xlocale.h>
- #endif
- #if defined(__APPLE__) || defined(__FreeBSD__) || defined(__OpenBSD__)
- static inline long statfs_bsize(struct statfs *sf) { return sf->f_iosize; }
- static inline long statfs_frsize(struct statfs *sf) { return sf->f_bsize; }
- #else
- static inline long statfs_bsize(struct statfs *sf) { return sf->f_bsize; }
- static inline long statfs_frsize(struct statfs *sf) { return sf->f_frsize; }
- #endif
- // Android is missing some headers and functions
- // "generated/config.h" is included first
- #if __has_include(<shadow.h>)
- #include <shadow.h>
- #endif
- #if __has_include(<utmpx.h>)
- #include <utmpx.h>
- #else
- struct utmpx {int ut_type;};
- #define USER_PROCESS 0
- static inline struct utmpx *getutxent(void) {return 0;}
- static inline void setutxent(void) {;}
- static inline void endutxent(void) {;}
- #endif
- // Some systems don't define O_NOFOLLOW, and it varies by architecture, so...
- #include <fcntl.h>
- #ifndef O_NOFOLLOW
- #define O_NOFOLLOW 0
- #endif
- #ifndef O_NOATIME
- #define O_NOATIME 01000000
- #endif
- #ifndef O_CLOEXEC
- #define O_CLOEXEC 02000000
- #endif
- #ifndef O_PATH
- #define O_PATH 010000000
- #endif
- #ifndef SCHED_RESET_ON_FORK
- #define SCHED_RESET_ON_FORK (1<<30)
- #endif
- // Glibc won't give you linux-kernel constants unless you say "no, a BUD lite"
- // even though linux has nothing to do with the FSF and never has.
- #ifndef F_SETPIPE_SZ
- #define F_SETPIPE_SZ 1031
- #endif
- #ifndef F_GETPIPE_SZ
- #define F_GETPIPE_SZ 1032
- #endif
- #if defined(__SIZEOF_DOUBLE__) && defined(__SIZEOF_LONG__) \
- && __SIZEOF_DOUBLE__ <= __SIZEOF_LONG__
- typedef double FLOAT;
- #else
- typedef float FLOAT;
- #endif
- #ifndef __uClinux__
- pid_t xfork(void);
- #endif
- // gratuitously memsets ALL the extra space with zeroes (not just a terminator)
- // but to make up for it truncating doesn't null terminate the output at all.
- // There are occasions to use it, but it is NOT A GENERAL PURPOSE FUNCTION.
- // #define strncpy(...) @@strncpyisbadmmkay@@
- // strncat writes a null terminator one byte PAST the buffer size it's given.
- #define strncat(...) strncatisbadmmkay(__VA_ARGS__)
- // Support building the Android tools on glibc, so hermetic AOSP builds can
- // use toybox before they're ready to switch to host bionic.
- #ifdef __BIONIC__
- #include <android/log.h>
- #else
- typedef enum android_LogPriority {
- ANDROID_LOG_UNKNOWN = 0,
- ANDROID_LOG_DEFAULT,
- ANDROID_LOG_VERBOSE,
- ANDROID_LOG_DEBUG,
- ANDROID_LOG_INFO,
- ANDROID_LOG_WARN,
- ANDROID_LOG_ERROR,
- ANDROID_LOG_FATAL,
- ANDROID_LOG_SILENT,
- } android_LogPriority;
- #endif
- #if !defined(__BIONIC__) || defined(__ANDROID_NDK__)
- // Android NDKv18 has liblog.so but not liblog.a for static builds.
- static inline int stub_out_log_write(int pri, const char *tag, const char *msg)
- {
- return -1;
- }
- #ifdef __ANDROID_NDK__
- #define __android_log_write(a, b, c) stub_out_log_write(a, b, c)
- #endif
- #endif
- // libprocessgroup is an Android platform library not included in the NDK.
- #if defined(__BIONIC__)
- #if __has_include(<processgroup/sched_policy.h>)
- #include <processgroup/sched_policy.h>
- #define GOT_IT
- #endif
- #endif
- #ifdef GOT_IT
- #undef GOT_IT
- #else
- static inline int get_sched_policy(int tid, void *policy) {return 0;}
- static inline char *get_sched_policy_name(int policy) {return "unknown";}
- #endif
- #ifndef SYSLOG_NAMES
- typedef struct {char *c_name; int c_val;} CODE;
- extern CODE prioritynames[], facilitynames[];
- #endif
- #if __has_include (<sys/random.h>)
- #include <sys/random.h>
- #endif
- void xgetrandom(void *buf, unsigned len);
- // Android's bionic libc doesn't have confstr.
- #ifdef __BIONIC__
- #define _CS_PATH 0
- #define _CS_V7_ENV 1
- #include <string.h>
- static inline void confstr(int a, char *b, int c) {strcpy(b, a ? "POSIXLY_CORRECT=1" : "/bin:/usr/bin");}
- #endif
- // Paper over the differences between BSD kqueue and Linux inotify for tail.
- struct xnotify {
- char **paths;
- int max, *fds, count, kq;
- };
- struct xnotify *xnotify_init(int max);
- int xnotify_add(struct xnotify *not, int fd, char *path);
- int xnotify_wait(struct xnotify *not, char **path);
- int sig_to_num(char *s);
- char *num_to_sig(int sig);
- struct signame {
- int num;
- char *name;
- };
- void xsignal_all_killers(void *handler);
- // Different OSes encode major/minor device numbers differently.
- int dev_minor(int dev);
- int dev_major(int dev);
- int dev_makedev(int major, int minor);
- char *fs_type_name(struct statfs *statfs);
- int get_block_device_size(int fd, unsigned long long *size);
- #ifdef __APPLE__
- // Apple doesn't have POSIX timers; this is "just enough" for timeout(1).
- typedef int timer_t;
- struct itimerspec {
- struct timespec it_value;
- };
- int timer_create(clock_t c, struct sigevent *se, timer_t *t);
- int timer_settime(timer_t t, int flags, struct itimerspec *new, void *old);
- #elif defined(__GLIBC__)
- // Work around a glibc bug that interacts badly with a gcc bug.
- #include <syscall.h>
- #include <signal.h>
- #include <time.h>
- int timer_create_wrap(clockid_t c, struct sigevent *se, timer_t *t);
- #define timer_create(...) timer_create_wrap(__VA_ARGS__)
- int timer_settime_wrap(timer_t t, int flags, struct itimerspec *val,
- struct itimerspec *old);
- #define timer_settime(...) timer_settime_wrap(__VA_ARGS__)
- #endif
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