Add a "fork" of musl as //fusl.

fusl/include/unistd.h

Index: fusl/include/unistd.h
diff --git a/fusl/include/unistd.h b/fusl/include/unistd.h
new file mode 100644
index 0000000000000000000000000000000000000000..760a1652abece83e3b28f82247acab16b3bf5c61
--- /dev/null
+++ b/fusl/include/unistd.h
@@ -0,0 +1,465 @@
+#ifndef	_UNISTD_H
+#define	_UNISTD_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <features.h>
+
+#define STDIN_FILENO  0
+#define STDOUT_FILENO 1
+#define STDERR_FILENO 2
+
+#define SEEK_SET 0
+#define SEEK_CUR 1
+#define SEEK_END 2
+
+#ifdef __cplusplus
+#define NULL 0L
+#else
+#define NULL ((void*)0)
+#endif
+
+#define __NEED_size_t
+#define __NEED_ssize_t
+#define __NEED_uid_t
+#define __NEED_gid_t
+#define __NEED_off_t
+#define __NEED_pid_t
+#define __NEED_intptr_t
+#define __NEED_useconds_t
+
+#include <bits/alltypes.h>
+
+int pipe(int [2]);
+int pipe2(int [2], int);
+int close(int);
+int posix_close(int, int);
+int dup(int);
+int dup2(int, int);
+int dup3(int, int, int);
+off_t lseek(int, off_t, int);
+int fsync(int);
+int fdatasync(int);
+
+ssize_t read(int, void *, size_t);
+ssize_t write(int, const void *, size_t);
+ssize_t pread(int, void *, size_t, off_t);
+ssize_t pwrite(int, const void *, size_t, off_t);
+
+int chown(const char *, uid_t, gid_t);
+int fchown(int, uid_t, gid_t);
+int lchown(const char *, uid_t, gid_t);
+int fchownat(int, const char *, uid_t, gid_t, int);
+
+int link(const char *, const char *);
+int linkat(int, const char *, int, const char *, int);
+int symlink(const char *, const char *);
+int symlinkat(const char *, int, const char *);
+ssize_t readlink(const char *__restrict, char *__restrict, size_t);
+ssize_t readlinkat(int, const char *__restrict, char *__restrict, size_t);
+int unlink(const char *);
+int unlinkat(int, const char *, int);
+int rmdir(const char *);
+int truncate(const char *, off_t);
+int ftruncate(int, off_t);
+
+#define F_OK 0
+#define R_OK 4
+#define W_OK 2
+#define X_OK 1
+
+int access(const char *, int);
+int faccessat(int, const char *, int, int);
+
+int chdir(const char *);
+int fchdir(int);
+char *getcwd(char *, size_t);
+
+unsigned alarm(unsigned);
+unsigned sleep(unsigned);
+int pause(void);
+
+pid_t fork(void);
+int execve(const char *, char *const [], char *const []);
+int execv(const char *, char *const []);
+int execle(const char *, const char *, ...);
+int execl(const char *, const char *, ...);
+int execvp(const char *, char *const []);
+int execlp(const char *, const char *, ...);
+int fexecve(int, char *const [], char *const []);
+_Noreturn void _exit(int);
+
+pid_t getpid(void);
+pid_t getppid(void);
+pid_t getpgrp(void);
+pid_t getpgid(pid_t);
+int setpgid(pid_t, pid_t);
+pid_t setsid(void);
+pid_t getsid(pid_t);
+char *ttyname(int);
+int ttyname_r(int, char *, size_t);
+int isatty(int);
+pid_t tcgetpgrp(int);
+int tcsetpgrp(int, pid_t);
+
+uid_t getuid(void);
+uid_t geteuid(void);
+gid_t getgid(void);
+gid_t getegid(void);
+int getgroups(int, gid_t []);
+int setuid(uid_t);
+int setreuid(uid_t, uid_t);
+int seteuid(uid_t);
+int setgid(gid_t);
+int setregid(gid_t, gid_t);
+int setegid(gid_t);
+
+char *getlogin(void);
+int getlogin_r(char *, size_t);
+int gethostname(char *, size_t);
+char *ctermid(char *);
+
+int getopt(int, char * const [], const char *);
+extern char *optarg;
+extern int optind, opterr, optopt;
+
+long pathconf(const char *, int);
+long fpathconf(int, int);
+long sysconf(int);
+size_t confstr(int, char *, size_t);
+
+#define F_ULOCK 0
+#define F_LOCK  1
+#define F_TLOCK 2
+#define F_TEST  3
+
+#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+int lockf(int, int, off_t);
+long gethostid(void);
+int nice(int);
+void sync(void);
+pid_t setpgrp(void);
+char *crypt(const char *, const char *);
+void encrypt(char *, int);
+void swab(const void *__restrict, void *__restrict, ssize_t);
+#endif
+
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE) \
+ || (defined(_XOPEN_SOURCE) && _XOPEN_SOURCE+0 < 700)
+int usleep(unsigned);
+unsigned ualarm(unsigned, unsigned);
+#endif
+
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+#define L_SET 0
+#define L_INCR 1
+#define L_XTND 2
+int brk(void *);
+void *sbrk(intptr_t);
+pid_t vfork(void);
+int vhangup(void);
+int chroot(const char *);
+int getpagesize(void);
+int getdtablesize(void);
+int sethostname(const char *, size_t);
+int getdomainname(char *, size_t);
+int setdomainname(const char *, size_t);
+int setgroups(size_t, const gid_t *);
+char *getpass(const char *);
+int daemon(int, int);
+void setusershell(void);
+void endusershell(void);
+char *getusershell(void);
+int acct(const char *);
+long syscall(long, ...);
+int execvpe(const char *, char *const [], char *const []);
+int issetugid(void);
+#endif
+
+#ifdef _GNU_SOURCE
+extern char **environ;
+int setresuid(uid_t, uid_t, uid_t);
+int setresgid(gid_t, gid_t, gid_t);
+int getresuid(uid_t *, uid_t *, uid_t *);
+int getresgid(gid_t *, gid_t *, gid_t *);
+char *get_current_dir_name(void);
+int syncfs(int);
+int euidaccess(const char *, int);
+int eaccess(const char *, int);
+#endif
+
+#if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
+#define lseek64 lseek
+#define pread64 pread
+#define pwrite64 pwrite
+#define truncate64 truncate
+#define ftruncate64 ftruncate
+#define lockf64 lockf
+#define off64_t off_t
+#endif
+
+#define POSIX_CLOSE_RESTART     0
+
+#define _XOPEN_VERSION          700
+#define _XOPEN_UNIX             1
+#define _XOPEN_ENH_I18N         1
+
+#define _POSIX_VERSION          200809L
+#define _POSIX2_VERSION         _POSIX_VERSION
+
+#define _POSIX_ADVISORY_INFO    _POSIX_VERSION
+#define _POSIX_CHOWN_RESTRICTED 1
+#define _POSIX_IPV6             _POSIX_VERSION
+#define _POSIX_JOB_CONTROL      1
+#define _POSIX_MAPPED_FILES     _POSIX_VERSION
+#define _POSIX_MEMLOCK          _POSIX_VERSION
+#define _POSIX_MEMLOCK_RANGE    _POSIX_VERSION
+#define _POSIX_MEMORY_PROTECTION _POSIX_VERSION
+#define _POSIX_MESSAGE_PASSING  _POSIX_VERSION
+#define _POSIX_FSYNC            _POSIX_VERSION
+#define _POSIX_NO_TRUNC         1
+#define _POSIX_RAW_SOCKETS      _POSIX_VERSION
+#define _POSIX_REALTIME_SIGNALS _POSIX_VERSION
+#define _POSIX_REGEXP           1
+#define _POSIX_SAVED_IDS        1
+#define _POSIX_SHELL            1
+#define _POSIX_SPAWN            _POSIX_VERSION
+#define _POSIX_VDISABLE         0
+
+#define _POSIX_THREADS          _POSIX_VERSION
+#define _POSIX_THREAD_PROCESS_SHARED _POSIX_VERSION
+#define _POSIX_THREAD_SAFE_FUNCTIONS _POSIX_VERSION
+#define _POSIX_THREAD_ATTR_STACKADDR _POSIX_VERSION
+#define _POSIX_THREAD_ATTR_STACKSIZE _POSIX_VERSION
+#define _POSIX_THREAD_PRIORITY_SCHEDULING _POSIX_VERSION
+#define _POSIX_THREAD_CPUTIME   _POSIX_VERSION
+#define _POSIX_TIMERS           _POSIX_VERSION
+#define _POSIX_TIMEOUTS         _POSIX_VERSION
+#define _POSIX_MONOTONIC_CLOCK  _POSIX_VERSION
+#define _POSIX_CPUTIME          _POSIX_VERSION
+#define _POSIX_CLOCK_SELECTION  _POSIX_VERSION
+#define _POSIX_BARRIERS         _POSIX_VERSION
+#define _POSIX_SPIN_LOCKS       _POSIX_VERSION
+#define _POSIX_READER_WRITER_LOCKS _POSIX_VERSION
+#define _POSIX_ASYNCHRONOUS_IO  _POSIX_VERSION
+#define _POSIX_SEMAPHORES       _POSIX_VERSION
+#define _POSIX_SHARED_MEMORY_OBJECTS _POSIX_VERSION
+
+#define _POSIX2_C_BIND          _POSIX_VERSION
+
+#include <bits/posix.h>
+
+
+
+#define _PC_LINK_MAX	0
+#define _PC_MAX_CANON	1
+#define _PC_MAX_INPUT	2
+#define _PC_NAME_MAX	3
+#define _PC_PATH_MAX	4
+#define _PC_PIPE_BUF	5
+#define _PC_CHOWN_RESTRICTED	6
+#define _PC_NO_TRUNC	7
+#define _PC_VDISABLE	8
+#define _PC_SYNC_IO	9
+#define _PC_ASYNC_IO	10
+#define _PC_PRIO_IO	11
+#define _PC_SOCK_MAXBUF	12
+#define _PC_FILESIZEBITS	13
+#define _PC_REC_INCR_XFER_SIZE	14
+#define _PC_REC_MAX_XFER_SIZE	15
+#define _PC_REC_MIN_XFER_SIZE	16
+#define _PC_REC_XFER_ALIGN	17
+#define _PC_ALLOC_SIZE_MIN	18
+#define _PC_SYMLINK_MAX	19
+#define _PC_2_SYMLINKS	20
+
+#define _SC_ARG_MAX	0
+#define _SC_CHILD_MAX	1
+#define _SC_CLK_TCK	2
+#define _SC_NGROUPS_MAX	3
+#define _SC_OPEN_MAX	4
+#define _SC_STREAM_MAX	5
+#define _SC_TZNAME_MAX	6
+#define _SC_JOB_CONTROL	7
+#define _SC_SAVED_IDS	8
+#define _SC_REALTIME_SIGNALS	9
+#define _SC_PRIORITY_SCHEDULING	10
+#define _SC_TIMERS	11
+#define _SC_ASYNCHRONOUS_IO	12
+#define _SC_PRIORITIZED_IO	13
+#define _SC_SYNCHRONIZED_IO	14
+#define _SC_FSYNC	15
+#define _SC_MAPPED_FILES	16
+#define _SC_MEMLOCK	17
+#define _SC_MEMLOCK_RANGE	18
+#define _SC_MEMORY_PROTECTION	19
+#define _SC_MESSAGE_PASSING	20
+#define _SC_SEMAPHORES	21
+#define _SC_SHARED_MEMORY_OBJECTS	22
+#define _SC_AIO_LISTIO_MAX	23
+#define _SC_AIO_MAX	24
+#define _SC_AIO_PRIO_DELTA_MAX	25
+#define _SC_DELAYTIMER_MAX	26
+#define _SC_MQ_OPEN_MAX	27
+#define _SC_MQ_PRIO_MAX	28
+#define _SC_VERSION	29
+#define _SC_PAGE_SIZE	30
+#define _SC_PAGESIZE	30 /* !! */
+#define _SC_RTSIG_MAX	31
+#define _SC_SEM_NSEMS_MAX	32
+#define _SC_SEM_VALUE_MAX	33
+#define _SC_SIGQUEUE_MAX	34
+#define _SC_TIMER_MAX	35
+#define _SC_BC_BASE_MAX	36
+#define _SC_BC_DIM_MAX	37
+#define _SC_BC_SCALE_MAX	38
+#define _SC_BC_STRING_MAX	39
+#define _SC_COLL_WEIGHTS_MAX	40
+#define _SC_EXPR_NEST_MAX	42
+#define _SC_LINE_MAX	43
+#define _SC_RE_DUP_MAX	44
+#define _SC_2_VERSION	46
+#define _SC_2_C_BIND	47
+#define _SC_2_C_DEV	48
+#define _SC_2_FORT_DEV	49
+#define _SC_2_FORT_RUN	50
+#define _SC_2_SW_DEV	51
+#define _SC_2_LOCALEDEF	52
+#define _SC_UIO_MAXIOV	60 /* !! */
+#define _SC_IOV_MAX	60
+#define _SC_THREADS	67
+#define _SC_THREAD_SAFE_FUNCTIONS	68
+#define _SC_GETGR_R_SIZE_MAX	69
+#define _SC_GETPW_R_SIZE_MAX	70
+#define _SC_LOGIN_NAME_MAX	71
+#define _SC_TTY_NAME_MAX	72
+#define _SC_THREAD_DESTRUCTOR_ITERATIONS	73
+#define _SC_THREAD_KEYS_MAX	74
+#define _SC_THREAD_STACK_MIN	75
+#define _SC_THREAD_THREADS_MAX	76
+#define _SC_THREAD_ATTR_STACKADDR	77
+#define _SC_THREAD_ATTR_STACKSIZE	78
+#define _SC_THREAD_PRIORITY_SCHEDULING	79
+#define _SC_THREAD_PRIO_INHERIT	80
+#define _SC_THREAD_PRIO_PROTECT	81
+#define _SC_THREAD_PROCESS_SHARED	82
+#define _SC_NPROCESSORS_CONF	83
+#define _SC_NPROCESSORS_ONLN	84
+#define _SC_PHYS_PAGES	85
+#define _SC_AVPHYS_PAGES	86
+#define _SC_ATEXIT_MAX	87
+#define _SC_PASS_MAX	88
+#define _SC_XOPEN_VERSION	89
+#define _SC_XOPEN_XCU_VERSION	90
+#define _SC_XOPEN_UNIX	91
+#define _SC_XOPEN_CRYPT	92
+#define _SC_XOPEN_ENH_I18N	93
+#define _SC_XOPEN_SHM	94
+#define _SC_2_CHAR_TERM	95
+#define _SC_2_UPE	97
+#define _SC_XOPEN_XPG2	98
+#define _SC_XOPEN_XPG3	99
+#define _SC_XOPEN_XPG4	100
+#define _SC_NZERO	109
+#define _SC_XBS5_ILP32_OFF32	125
+#define _SC_XBS5_ILP32_OFFBIG	126
+#define _SC_XBS5_LP64_OFF64	127
+#define _SC_XBS5_LPBIG_OFFBIG	128
+#define _SC_XOPEN_LEGACY	129
+#define _SC_XOPEN_REALTIME	130
+#define _SC_XOPEN_REALTIME_THREADS	131
+#define _SC_ADVISORY_INFO	132
+#define _SC_BARRIERS	133
+#define _SC_CLOCK_SELECTION	137
+#define _SC_CPUTIME	138
+#define _SC_THREAD_CPUTIME	139
+#define _SC_MONOTONIC_CLOCK	149
+#define _SC_READER_WRITER_LOCKS	153
+#define _SC_SPIN_LOCKS	154
+#define _SC_REGEXP	155
+#define _SC_SHELL	157
+#define _SC_SPAWN	159
+#define _SC_SPORADIC_SERVER	160
+#define _SC_THREAD_SPORADIC_SERVER	161
+#define _SC_TIMEOUTS	164
+#define _SC_TYPED_MEMORY_OBJECTS	165
+#define _SC_2_PBS	168
+#define _SC_2_PBS_ACCOUNTING	169
+#define _SC_2_PBS_LOCATE	170
+#define _SC_2_PBS_MESSAGE	171
+#define _SC_2_PBS_TRACK	172
+#define _SC_SYMLOOP_MAX	173
+#define _SC_STREAMS	174
+#define _SC_2_PBS_CHECKPOINT	175
+#define _SC_V6_ILP32_OFF32	176
+#define _SC_V6_ILP32_OFFBIG	177
+#define _SC_V6_LP64_OFF64	178
+#define _SC_V6_LPBIG_OFFBIG	179
+#define _SC_HOST_NAME_MAX	180
+#define _SC_TRACE	181
+#define _SC_TRACE_EVENT_FILTER	182
+#define _SC_TRACE_INHERIT	183
+#define _SC_TRACE_LOG	184
+
+#define _SC_IPV6	235
+#define _SC_RAW_SOCKETS	236
+#define _SC_V7_ILP32_OFF32	237
+#define _SC_V7_ILP32_OFFBIG	238
+#define _SC_V7_LP64_OFF64	239
+#define _SC_V7_LPBIG_OFFBIG	240
+#define _SC_SS_REPL_MAX	241
+#define _SC_TRACE_EVENT_NAME_MAX	242
+#define _SC_TRACE_NAME_MAX	243
+#define _SC_TRACE_SYS_MAX	244
+#define _SC_TRACE_USER_EVENT_MAX	245
+#define _SC_XOPEN_STREAMS	246
+#define _SC_THREAD_ROBUST_PRIO_INHERIT	247
+#define _SC_THREAD_ROBUST_PRIO_PROTECT	248
+
+#define _CS_PATH	0
+#define _CS_POSIX_V6_WIDTH_RESTRICTED_ENVS	1
+#define _CS_GNU_LIBC_VERSION	2
+#define _CS_GNU_LIBPTHREAD_VERSION	3
+#define _CS_POSIX_V5_WIDTH_RESTRICTED_ENVS	4
+#define _CS_POSIX_V7_WIDTH_RESTRICTED_ENVS	5
+
+#define _CS_POSIX_V6_ILP32_OFF32_CFLAGS	1116
+#define _CS_POSIX_V6_ILP32_OFF32_LDFLAGS	1117
+#define _CS_POSIX_V6_ILP32_OFF32_LIBS	1118
+#define _CS_POSIX_V6_ILP32_OFF32_LINTFLAGS	1119
+#define _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS	1120
+#define _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS	1121
+#define _CS_POSIX_V6_ILP32_OFFBIG_LIBS	1122
+#define _CS_POSIX_V6_ILP32_OFFBIG_LINTFLAGS	1123
+#define _CS_POSIX_V6_LP64_OFF64_CFLAGS	1124
+#define _CS_POSIX_V6_LP64_OFF64_LDFLAGS	1125
+#define _CS_POSIX_V6_LP64_OFF64_LIBS	1126
+#define _CS_POSIX_V6_LP64_OFF64_LINTFLAGS	1127
+#define _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS	1128
+#define _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS	1129
+#define _CS_POSIX_V6_LPBIG_OFFBIG_LIBS	1130
+#define _CS_POSIX_V6_LPBIG_OFFBIG_LINTFLAGS	1131
+#define _CS_POSIX_V7_ILP32_OFF32_CFLAGS	1132
+#define _CS_POSIX_V7_ILP32_OFF32_LDFLAGS	1133
+#define _CS_POSIX_V7_ILP32_OFF32_LIBS	1134
+#define _CS_POSIX_V7_ILP32_OFF32_LINTFLAGS	1135
+#define _CS_POSIX_V7_ILP32_OFFBIG_CFLAGS	1136
+#define _CS_POSIX_V7_ILP32_OFFBIG_LDFLAGS	1137
+#define _CS_POSIX_V7_ILP32_OFFBIG_LIBS	1138
+#define _CS_POSIX_V7_ILP32_OFFBIG_LINTFLAGS	1139
+#define _CS_POSIX_V7_LP64_OFF64_CFLAGS	1140
+#define _CS_POSIX_V7_LP64_OFF64_LDFLAGS	1141
+#define _CS_POSIX_V7_LP64_OFF64_LIBS	1142
+#define _CS_POSIX_V7_LP64_OFF64_LINTFLAGS	1143
+#define _CS_POSIX_V7_LPBIG_OFFBIG_CFLAGS	1144
+#define _CS_POSIX_V7_LPBIG_OFFBIG_LDFLAGS	1145
+#define _CS_POSIX_V7_LPBIG_OFFBIG_LIBS	1146
+#define _CS_POSIX_V7_LPBIG_OFFBIG_LINTFLAGS	1147
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif