Cygwin: include/cygwin/limits.h: new header
The new header defines some Cygwin-specific limits, using private names. It is included by include/limits.h. For example, we now have #define __OPEN_MAX 3200 in include/cygwin/limits.h and #define OPEN_MAX __OPEN_MAX in include/limits.h. The purpose is to hide implementation details from users who view <limits.h>.
This commit is contained in:
Ken Brown
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/* cygwin/limits.h
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#ifndef _CYGWIN_LIMITS_H__
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#define _CYGWIN_LIMITS_H__
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#define __AIO_LISTIO_MAX 32
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#define __AIO_MAX 8
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#define __AIO_PRIO_DELTA_MAX 0
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/* 32000 is the safe value used for Windows processes when called from
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Cygwin processes. */
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#define __ARG_MAX 32000
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#define __ATEXIT_MAX 32
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#define __CHILD_MAX 256
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#define __DELAYTIMER_MAX __INT_MAX__
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#define __HOST_NAME_MAX 255
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#define __IOV_MAX 1024
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#define __LOGIN_NAME_MAX 256 /* equal to UNLEN defined in w32api/lmcons.h */
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#define __MQ_OPEN_MAX 256
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#define __MQ_PRIO_MAX INT_MAX
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#define __OPEN_MAX 3200 /* value of the old OPEN_MAX_MAX */
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#define __PAGESIZE 65536
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#define __PTHREAD_DESTRUCTOR_ITERATIONS 4
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/* Tls has 1088 items - and we don't want to use them all :] */
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#define __PTHREAD_KEYS_MAX 1024
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/* Actually the minimum stack size is somewhat of a split personality.
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The size parameter in a CreateThread call is the size of the initially
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commited stack size, which can be specified as low as 4K. However, the
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default *reserved* stack size is 1 Meg, unless the .def file specifies
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another STACKSIZE value. And even if you specify a stack size below 64K,
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the allocation granularity is in the way. You can never squeeze multiple
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threads in the same allocation granularity slot. Oh well. */
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#define __PTHREAD_STACK_MIN 65536
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/* FIXME: We only support one realtime signal in 32 bit mode, but
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_POSIX_RTSIG_MAX is 8. */
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#if __WORDSIZE == 64
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#define __RTSIG_MAX 33
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#else
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#define __RTSIG_MAX 1
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#endif
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#define __SEM_VALUE_MAX 1147483648
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#define __SIGQUEUE_MAX 32
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#define __STREAM_MAX 20
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#define __SYMLOOP_MAX 10
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#define __TIMER_MAX 32
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#define __TTY_NAME_MAX 32
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#define __FILESIZEBITS 64
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#define __LINK_MAX 1024
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#define __MAX_CANON 255
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#define __MAX_INPUT 255
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#define __NAME_MAX 255
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/* Keep in sync with __PATHNAME_MAX__ in cygwin/config.h */
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#define __PATH_MAX 4096
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#define __PIPE_BUF 4096
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#endif /* _CYGWIN_LIMITS_H__ */
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@ -10,6 +10,7 @@ details. */
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#include <features.h>
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#include <bits/wordsize.h>
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#include <cygwin/limits.h>
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#ifndef _MACH_MACHLIMITS_H_
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@ -156,67 +157,66 @@ details. */
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/* Maximum number of I/O operations in a single list I/O call supported by
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the implementation. */
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#define AIO_LISTIO_MAX 32
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#define AIO_LISTIO_MAX __AIO_LISTIO_MAX
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/* Maximum number of outstanding asynchronous I/O operations supported by
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the implementation. */
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#define AIO_MAX 8
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#define AIO_MAX __AIO_MAX
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/* The maximum amount by which a process can decrease its asynchronous I/O
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priority level from its own scheduling priority. Not yet implemented. */
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#define AIO_PRIO_DELTA_MAX 0
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#define AIO_PRIO_DELTA_MAX __AIO_PRIO_DELTA_MAX
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/* Maximum number of bytes in arguments and environment passed in an exec
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call. 32000 is the safe value used for Windows processes when called
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from Cygwin processes. */
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call. */
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#undef ARG_MAX
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#define ARG_MAX 32000
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#define ARG_MAX __ARG_MAX
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#if __XSI_VISIBLE || __POSIX_VISIBLE >= 200809
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/* Maximum number of functions that may be registered with atexit(). */
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#undef ATEXIT_MAX
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#define ATEXIT_MAX 32
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#define ATEXIT_MAX __ATEXIT_MAX
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#endif
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/* Maximum number of simultaneous processes per real user ID. */
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#undef CHILD_MAX
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#define CHILD_MAX 256
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#define CHILD_MAX __CHILD_MAX
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/* Maximum number of timer expiration overruns. Not yet implemented. */
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#undef DELAYTIMER_MAX
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#define DELAYTIMER_MAX __INT_MAX__
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#define DELAYTIMER_MAX __DELAYTIMER_MAX
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/* Maximum length of a host name. */
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#undef HOST_NAME_MAX
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#define HOST_NAME_MAX 255
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#define HOST_NAME_MAX __HOST_NAME_MAX
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#if __XSI_VISIBLE
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/* Maximum number of iovcnt in a writev (an arbitrary number) */
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#undef IOV_MAX
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#define IOV_MAX 1024
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#define IOV_MAX __IOV_MAX
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#endif
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/* Maximum number of characters in a login name. */
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#undef LOGIN_NAME_MAX
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#define LOGIN_NAME_MAX 256 /* equal to UNLEN defined in w32api/lmcons.h */
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#define LOGIN_NAME_MAX __LOGIN_NAME_MAX
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/* The maximum number of open message queue descriptors a process may hold. */
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#undef MQ_OPEN_MAX
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#define MQ_OPEN_MAX OPEN_MAX
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#define MQ_OPEN_MAX __MQ_OPEN_MAX
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/* The maximum number of message priorities supported by the implementation. */
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#undef MQ_PRIO_MAX
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#define MQ_PRIO_MAX INT_MAX
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#define MQ_PRIO_MAX __MQ_PRIO_MAX
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/* # of open files per process. This limit is returned by
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getdtablesize(), sysconf(_SC_OPEN_MAX), and
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getrlimit(RLIMIT_NOFILE). */
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#undef OPEN_MAX
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#define OPEN_MAX 3200
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#define OPEN_MAX __OPEN_MAX
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/* Size in bytes of a page. */
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#undef PAGESIZE
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#define PAGESIZE 65536
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#define PAGESIZE __PAGESIZE
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#if __XSI_VISIBLE
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#undef PAGE_SIZE
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#define PAGE_SIZE PAGESIZE
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@ -225,23 +225,15 @@ details. */
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/* Maximum number of attempts made to destroy a thread's thread-specific
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data values on thread exit. */
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#undef PTHREAD_DESTRUCTOR_ITERATIONS
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#define PTHREAD_DESTRUCTOR_ITERATIONS 4
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#define PTHREAD_DESTRUCTOR_ITERATIONS __PTHREAD_DESTRUCTOR_ITERATIONS
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/* Maximum number of data keys that can be created by a process. */
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/* Tls has 1088 items - and we don't want to use them all :] */
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#undef PTHREAD_KEYS_MAX
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#define PTHREAD_KEYS_MAX 1024
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#define PTHREAD_KEYS_MAX __PTHREAD_KEYS_MAX
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/* Minimum size in bytes of thread stack storage. */
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/* Actually the minimum stack size is somewhat of a split personality.
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The size parameter in a CreateThread call is the size of the initially
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commited stack size, which can be specified as low as 4K. However, the
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default *reserved* stack size is 1 Meg, unless the .def file specifies
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another STACKSIZE value. And even if you specify a stack size below 64K,
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the allocation granularity is in the way. You can never squeeze multiple
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threads in the same allocation granularity slot. Oh well. */
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#undef PTHREAD_STACK_MIN
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#define PTHREAD_STACK_MIN 65536
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#define PTHREAD_STACK_MIN __PTHREAD_STACK_MIN
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/* Maximum number of threads that can be created per process. */
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/* Windows allows any arbitrary number of threads per process. */
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@ -249,14 +241,8 @@ details. */
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/* #define PTHREAD_THREADS_MAX unspecified */
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/* Maximum number of realtime signals reserved for application use. */
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/* FIXME: We only support one realtime signal in 32 bit mode, but
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_POSIX_RTSIG_MAX is 8. */
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#undef RTSIG_MAX
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#if __WORDSIZE == 64
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#define RTSIG_MAX 33
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#else
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#define RTSIG_MAX 1
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#endif
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#define RTSIG_MAX __RTSIG_MAX
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/* Maximum number of semaphores that a process may have. */
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/* Windows allows any arbitrary number of semaphores per process. */
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@ -265,12 +251,12 @@ details. */
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/* The maximum value a semaphore may have. */
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#undef SEM_VALUE_MAX
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#define SEM_VALUE_MAX 1147483648
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#define SEM_VALUE_MAX __SEM_VALUE_MAX
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/* Maximum number of queued signals that a process may send and have pending
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at the receiver(s) at any time. */
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#undef SIGQUEUE_MAX
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#define SIGQUEUE_MAX 32
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#define SIGQUEUE_MAX __SIGQUEUE_MAX
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/* The maximum number of replenishment operations that may be simultaneously
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pending for a particular sporadic server scheduler. Not implemented. */
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@ -279,15 +265,15 @@ details. */
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/* Number of streams that one process can have open at one time. */
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#undef STREAM_MAX
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#define STREAM_MAX 20
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#define STREAM_MAX __STREAM_MAX
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/* Maximum number of nested symbolic links. */
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#undef SYMLOOP_MAX
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#define SYMLOOP_MAX 10
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#define SYMLOOP_MAX __SYMLOOP_MAX
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/* Maximum number of timer expiration overruns. */
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#undef TIMER_MAX
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#define TIMER_MAX 32
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#define TIMER_MAX __TIMER_MAX
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/* Maximum length of the trace event name. Not implemented. */
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#undef TRACE_EVENT_NAME_MAX
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@ -311,7 +297,7 @@ details. */
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/* Maximum number of characters in a tty name. */
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#undef TTY_NAME_MAX
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#define TTY_NAME_MAX 32
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#define TTY_NAME_MAX __TTY_NAME_MAX
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/* Maximum number of bytes supported for the name of a timezone (not of the TZ variable). Not implemented. */
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#undef TZNAME_MAX
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@ -322,35 +308,35 @@ details. */
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/* Minimum bits needed to represent the maximum size of a regular file. */
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#undef FILESIZEBITS
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#define FILESIZEBITS 64
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#define FILESIZEBITS __FILESIZEBITS
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/* Maximum number of hardlinks to a file. */
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#undef LINK_MAX
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#define LINK_MAX 1024
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#define LINK_MAX __LINK_MAX
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/* Maximum number of bytes in a terminal canonical input line. */
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#undef MAX_CANON
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#define MAX_CANON 255
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#define MAX_CANON __MAX_CANON
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/* Minimum number of bytes available in a terminal input queue. */
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#undef MAX_INPUT
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#define MAX_INPUT 255
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#define MAX_INPUT __MAX_INPUT
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/* Maximum length of a path component. */
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#undef NAME_MAX
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#define NAME_MAX 255
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#define NAME_MAX __NAME_MAX
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/* Maximum length of a path given to API functions including trailing NUL.
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Deliberately set to the same default value as on Linux. Internal paths
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may be longer. */
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/* Keep in sync with __PATHNAME_MAX__ in cygwin/config.h */
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#undef PATH_MAX
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#define PATH_MAX 4096
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#define PATH_MAX __PATH_MAX
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/* # of bytes in a pipe buf. This is the max # of bytes which can be
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written to a pipe in one atomic operation. */
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#undef PIPE_BUF
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#define PIPE_BUF 4096
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#define PIPE_BUF __PIPE_BUF
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/* Minimum number of bytes of storage actually allocated for any portion
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of a file. Not implemented. */
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