unistd.h

Newlib 嵌入式 C库 标准实现代码

int     _EXFUN(readlink, (const char *__path, char *__buf, int __buflen));
int     _EXFUN(symlink, (const char *__name1, const char *__name2));

#define	F_OK	0
#define	R_OK	4
#define	W_OK	2
#define	X_OK	1

# define	SEEK_SET	0
# define	SEEK_CUR	1
# define	SEEK_END	2

#include <sys/features.h>

#define STDIN_FILENO    0       /* standard input file descriptor */
#define STDOUT_FILENO   1       /* standard output file descriptor */
#define STDERR_FILENO   2       /* standard error file descriptor */

/*
 *  sysconf values per IEEE Std 1003.1, 2004 Edition
 */

#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_JOB_CONTROL                   5
#define _SC_SAVED_IDS                     6
#define _SC_VERSION                       7
#define _SC_PAGESIZE                      8
#define _SC_PAGE_SIZE                     _SC_PAGESIZE
/* These are non-POSIX values we accidentally introduced in 2000 without
   guarding them.  Keeping them unguarded for backward compatibility. */
#define _SC_NPROCESSORS_CONF              9
#define _SC_NPROCESSORS_ONLN             10
#define _SC_PHYS_PAGES                   11
#define _SC_AVPHYS_PAGES                 12
/* End of non-POSIX values. */
#define _SC_MQ_OPEN_MAX                  13
#define _SC_MQ_PRIO_MAX                  14
#define _SC_RTSIG_MAX                    15
#define _SC_SEM_NSEMS_MAX                16
#define _SC_SEM_VALUE_MAX                17
#define _SC_SIGQUEUE_MAX                 18
#define _SC_TIMER_MAX                    19
#define _SC_TZNAME_MAX                   20
#define _SC_ASYNCHRONOUS_IO              21
#define _SC_FSYNC                        22
#define _SC_MAPPED_FILES                 23
#define _SC_MEMLOCK                      24
#define _SC_MEMLOCK_RANGE                25
#define _SC_MEMORY_PROTECTION            26
#define _SC_MESSAGE_PASSING              27
#define _SC_PRIORITIZED_IO               28
#define _SC_REALTIME_SIGNALS             29
#define _SC_SEMAPHORES                   30
#define _SC_SHARED_MEMORY_OBJECTS        31
#define _SC_SYNCHRONIZED_IO              32
#define _SC_TIMERS                       33
#define _SC_AIO_LISTIO_MAX               34
#define _SC_AIO_MAX                      35
#define _SC_AIO_PRIO_DELTA_MAX           36
#define _SC_DELAYTIMER_MAX               37
#define _SC_THREAD_KEYS_MAX              38
#define _SC_THREAD_STACK_MIN             39
#define _SC_THREAD_THREADS_MAX           40
#define _SC_TTY_NAME_MAX                 41
#define _SC_THREADS                      42
#define _SC_THREAD_ATTR_STACKADDR        43
#define _SC_THREAD_ATTR_STACKSIZE        44
#define _SC_THREAD_PRIORITY_SCHEDULING   45
#define _SC_THREAD_PRIO_INHERIT          46
/* _SC_THREAD_PRIO_PROTECT was _SC_THREAD_PRIO_CEILING in early drafts */
#define _SC_THREAD_PRIO_PROTECT          47
#define _SC_THREAD_PRIO_CEILING          _SC_THREAD_PRIO_PROTECT
#define _SC_THREAD_PROCESS_SHARED        48
#define _SC_THREAD_SAFE_FUNCTIONS        49
#define _SC_GETGR_R_SIZE_MAX             50
#define _SC_GETPW_R_SIZE_MAX             51
#define _SC_LOGIN_NAME_MAX               52
#define _SC_THREAD_DESTRUCTOR_ITERATIONS 53
#define _SC_ADVISORY_INFO                54
#define _SC_ATEXIT_MAX                   55
#define _SC_BARRIERS                     56
#define _SC_BC_BASE_MAX                  57
#define _SC_BC_DIM_MAX                   58
#define _SC_BC_SCALE_MAX                 59
#define _SC_BC_STRING_MAX                60
#define _SC_CLOCK_SELECTION              61
#define _SC_COLL_WEIGHTS_MAX             62
#define _SC_CPUTIME                      63
#define _SC_EXPR_NEST_MAX                64
#define _SC_HOST_NAME_MAX                65
#define _SC_IOV_MAX                      66
#define _SC_IPV6                         67
#define _SC_LINE_MAX                     68
#define _SC_MONOTONIC_CLOCK              69
#define _SC_RAW_SOCKETS                  70
#define _SC_READER_WRITER_LOCKS          71
#define _SC_REGEXP                       72
#define _SC_RE_DUP_MAX                   73
#define _SC_SHELL                        74
#define _SC_SPAWN                        75
#define _SC_SPIN_LOCKS                   76
#define _SC_SPORADIC_SERVER              77
#define _SC_SS_REPL_MAX                  78
#define _SC_SYMLOOP_MAX                  79
#define _SC_THREAD_CPUTIME               80
#define _SC_THREAD_SPORADIC_SERVER       81
#define _SC_TIMEOUTS                     82
#define _SC_TRACE                        83
#define _SC_TRACE_EVENT_FILTER           84
#define _SC_TRACE_EVENT_NAME_MAX         85
#define _SC_TRACE_INHERIT                86
#define _SC_TRACE_LOG                    87
#define _SC_TRACE_NAME_MAX               88
#define _SC_TRACE_SYS_MAX                89
#define _SC_TRACE_USER_EVENT_MAX         90
#define _SC_TYPED_MEMORY_OBJECTS         91
#define _SC_V6_ILP32_OFF32               92
#define _SC_XBS5_ILP32_OFF32             _SC_V6_ILP32_OFF32
#define _SC_V6_ILP32_OFFBIG              93
#define _SC_XBS5_ILP32_OFFBIG            _SC_V6_ILP32_OFFBIG
#define _SC_V6_LP64_OFF64                94
#define _SC_XBS5_LP64_OFF64              _SC_V6_LP64_OFF64
#define _SC_V6_LPBIG_OFFBIG              95
#define _SC_XBS5_LPBIG_OFFBIG            _SC_V6_LPBIG_OFFBIG
#define _SC_XOPEN_CRYPT                  96
#define _SC_XOPEN_ENH_I18N               97
#define _SC_XOPEN_LEGACY                 98
#define _SC_XOPEN_REALTIME               99
#define _SC_STREAM_MAX                  100
#define _SC_PRIORITY_SCHEDULING         101
#define _SC_XOPEN_REALTIME_THREADS      102
#define _SC_XOPEN_SHM                   103
#define _SC_XOPEN_STREAMS               104
#define _SC_XOPEN_UNIX                  105
#define _SC_XOPEN_VERSION               106
#define _SC_2_CHAR_TERM                 107
#define _SC_2_C_BIND                    108
#define _SC_2_C_DEV                     109
#define _SC_2_FORT_DEV                  110
#define _SC_2_FORT_RUN                  111
#define _SC_2_LOCALEDEF                 112
#define _SC_2_PBS                       113
#define _SC_2_PBS_ACCOUNTING            114
#define _SC_2_PBS_CHECKPOINT            115
#define _SC_2_PBS_LOCATE                116
#define _SC_2_PBS_MESSAGE               117
#define _SC_2_PBS_TRACK                 118
#define _SC_2_SW_DEV                    119
#define _SC_2_UPE                       120
#define _SC_2_VERSION                   121

/*
 *  pathconf values per IEEE Std 1003.1, 2004 Edition
 */

#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_ASYNC_IO                      9
#define _PC_PRIO_IO                      10
#define _PC_SYNC_IO                      11
#define _PC_FILESIZEBITS                 12
#define _PC_2_SYMLINKS                   13
#define _PC_SYMLINK_MAX                  14
#ifdef __CYGWIN__
/* Ask for POSIX permission bits support. */
#define _PC_POSIX_PERMISSIONS            90
/* Ask for full POSIX permission support including uid/gid settings. */
#define _PC_POSIX_SECURITY               91
#endif

/*
 *  confstr values per IEEE Std 1003.1, 2004 Edition
 */

#ifdef __CYGWIN__	/* Only defined on Cygwin for now. */
#define _CS_PATH                               0
#define _CS_POSIX_V6_ILP32_OFF32_CFLAGS        1
#define _CS_XBS5_ILP32_OFF32_CFLAGS           _CS_POSIX_V6_ILP32_OFF32_CFLAGS
#define _CS_POSIX_V6_ILP32_OFF32_LDFLAGS       2
#define _CS_XBS5_ILP32_OFF32_LDFLAGS          _CS_POSIX_V6_ILP32_OFF32_LDFLAGS
#define _CS_POSIX_V6_ILP32_OFF32_LIBS          3
#define _CS_XBS5_ILP32_OFF32_LIBS             _CS_POSIX_V6_ILP32_OFF32_LIBS
#define _CS_XBS5_ILP32_OFF32_LINTFLAGS         4
#define _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS       5
#define _CS_XBS5_ILP32_OFFBIG_CFLAGS          _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS
#define _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS      6
#define _CS_XBS5_ILP32_OFFBIG_LDFLAGS         _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS
#define _CS_POSIX_V6_ILP32_OFFBIG_LIBS         7
#define _CS_XBS5_ILP32_OFFBIG_LIBS            _CS_POSIX_V6_ILP32_OFFBIG_LIBS
#define _CS_XBS5_ILP32_OFFBIG_LINTFLAGS        8
#define _CS_POSIX_V6_LP64_OFF64_CFLAGS         9
#define _CS_XBS5_LP64_OFF64_CFLAGS            _CS_POSIX_V6_LP64_OFF64_CFLAGS
#define _CS_POSIX_V6_LP64_OFF64_LDFLAGS       10
#define _CS_XBS5_LP64_OFF64_LDFLAGS           _CS_POSIX_V6_LP64_OFF64_LDFLAGS
#define _CS_POSIX_V6_LP64_OFF64_LIBS          11
#define _CS_XBS5_LP64_OFF64_LIBS              _CS_POSIX_V6_LP64_OFF64_LIBS
#define _CS_XBS5_LP64_OFF64_LINTFLAGS         12
#define _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS      13
#define _CS_XBS5_LPBIG_OFFBIG_CFLAGS          _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS
#define _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS     14
#define _CS_XBS5_LPBIG_OFFBIG_LDFLAGS         _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS
#define _CS_POSIX_V6_LPBIG_OFFBIG_LIBS        15
#define _CS_XBS5_LPBIG_OFFBIG_LIBS            _CS_POSIX_V6_LPBIG_OFFBIG_LIBS
#define _CS_XBS5_LPBIG_OFFBIG_LINTFLAGS       16
#define _CS_POSIX_V6_WIDTH_RESTRICTED_ENVS    17
#endif

#ifndef __CYGWIN__
# define	MAXPATHLEN	1024
#endif

#ifdef __cplusplus
}
#endif
#endif /* _SYS_UNISTD_H */