/* @(#)85 1.94 src/bos/kernel/sys/limits.h, incstd, bos510 11/30/00 16:29:35 */ /* * COMPONENT_NAME: (INCSTD) Standard Include Files * * FUNCTIONS: * * ORIGINS: 27 * * (C) COPYRIGHT International Business Machines Corp. 1985, 1995 * All Rights Reserved * Licensed Materials - Property of IBM * * US Government Users Restricted Rights - Use, duplication or * disclosure restricted by GSA ADP Schedule Contract with IBM Corp. */ #ifndef _H_LIMITS #define _H_LIMITS #ifdef __cplusplus extern "C" { #endif #ifndef _H_STANDARDS #include #endif /* * * The ANSI and POSIX standards require that certain values be in limits.h. * They also require that if _ANSI_C_SOURCE or _POSIX_SOURCE is * defined then ONLY those standard specific values are present. * This header includes all the ANSI and POSIX required entries. * In addition other entries for the AIX system are included. * */ #ifdef _ANSI_C_SOURCE /* C LANGUAGE LIMITS */ #define CHAR_BIT (8) #if defined(__ia64) && !defined(_CHAR_UNSIGNED) #define CHAR_MAX 127 #define CHAR_MIN (-128) #else #define CHAR_MAX UCHAR_MAX #define CHAR_MIN (0) #endif /* __ia64 && !_CHAR_UNSIGNED */ #define INT_MAX (2147483647) #define INT_MIN (-INT_MAX - 1) #ifdef __64BIT__ #define LONG_MAX (9223372036854775807) #define LONG_MIN (-LONG_MAX - 1) #define ULONG_MAX (18446744073709551615) #else /* __64BIT__ */ #define LONG_MAX INT_MAX #define LONG_MIN INT_MIN #define ULONG_MAX (UINT_MAX) #endif /* __64BIT__ */ #define SCHAR_MAX (127) #define SCHAR_MIN (-SCHAR_MAX - 1) #define SHRT_MAX (32767) #define SHRT_MIN (-SHRT_MAX - 1) #define UCHAR_MAX (255) #define UINT_MAX (4294967295U) #define USHRT_MAX (65535) #define MB_LEN_MAX 4 /* maximum bytes in multibyte char */ #endif /* _ANSI_C_SOURCE */ #ifdef _POSIX_SOURCE /* * The following are values that have historically been in limits.h. * * They are a part of the POSIX defined limits.h and therefore are * included when _POSIX_SOURCE is defined. * */ /* limits on a system conforming to the POSIX standard */ #define _POSIX_ARG_MAX 4096 #define _POSIX_CHILD_MAX 6 #define _POSIX_LINK_MAX 8 #define _POSIX_MAX_CANON 255 #define _POSIX_NAME_MAX 14 #define _POSIX_NGROUPS_MAX 0 #define _POSIX_MAX_INPUT 255 #define _POSIX_OPEN_MAX 16 #define _POSIX_PATH_MAX 255 #define _POSIX_PIPE_BUF 512 #define _POSIX_SSIZE_MAX 32767 #define _POSIX_STREAM_MAX 8 #define _POSIX_THREAD_KEYS_MAX 128 #define _POSIX_THREAD_DATAKEYS_MAX _POSIX_THREAD_KEYS_MAX #define _POSIX_THREAD_THREADS_MAX 64 #define _POSIX_TZNAME_MAX 3 #define _POSIX_LOGIN_NAME_MAX 9 #define _POSIX_TTY_NAME_MAX 9 #define _POSIX_THREAD_DESTRUCTOR_ITERATIONS 4 #define _POSIX_CLOCKRES_MIN 20000000 #define _POSIX_AIO_LISTIO_MAX 2 #define _POSIX_AIO_MAX 1 #define _POSIX_DELAYTIMER_MAX 32 #define _POSIX_MQ_OPEN_MAX 8 #define _POSIX_MQ_PRIO_MAX 32 #define _POSIX_RTSIG_MAX 8 #define _POSIX_SEM_NSEMS_MAX 256 #define _POSIX_SEM_VALUE_MAX 32767 #define _POSIX_SIGQUEUE_MAX 32 #define _POSIX_TIMER_MAX 32 /* The system supports the following utility limit minimum values */ #define _POSIX2_BC_BASE_MAX 99 /* max ibase and obase values for bc */ #define _POSIX2_BC_DIM_MAX 2048 /* max num elements in array for bc */ #define _POSIX2_BC_SCALE_MAX 99 /* max scale value allowed by bc */ #define _POSIX2_BC_STRING_MAX 1000 /* max len of string constant by bc */ #define _POSIX2_EQUIV_CLASS_MAX 2 /* this define is obsolete */ #define _POSIX2_COLL_WEIGHTS_MAX 2 /* max num weight for LC_COLLATE order */ #define _POSIX2_EXPR_NEST_MAX 32 /* max num expression nested for expr */ #define _POSIX2_LINE_MAX 2048 /* max len of utility input line */ #define _POSIX2_RE_DUP_MAX 255 /* max num repeated reg for interval not */ /* The system supports the following symbolic utility limits */ #define BC_BASE_MAX _POSIX2_BC_BASE_MAX #define BC_DIM_MAX _POSIX2_BC_DIM_MAX #define BC_SCALE_MAX _POSIX2_BC_SCALE_MAX #define BC_STRING_MAX 2048 #define EQUIV_CLASS_MAX 4 /* EQUIV_CLASS_MAX is obsolete */ #define COLL_WEIGHTS_MAX 4 #define EXPR_NEST_MAX _POSIX2_EXPR_NEST_MAX #define LINE_MAX _POSIX2_LINE_MAX #ifndef RE_DUP_MAX /* NLregexp.h */ #define RE_DUP_MAX _POSIX2_RE_DUP_MAX #endif /* RE_DUP_MAX */ /* RUN-TIME INVARIANT VALUES The system supports the following fixed magnitude limitations. */ #define MAX_INPUT 512 /* max bytes in terminal input queue, >= 256+64 */ #define NGROUPS_MAX 64 /* max number of supplementary group IDs per process, >= 0 */ #define SSIZE_MAX LONG_MAX /* largest value of ssize_t: LONG_MAX */ #define _SSIZE_MAX LONG_MAX /* largest value of ssize_t: LONG_MAX */ /* The following values will be undefined if the system supports a value that is equal or greater than the stated minimum AND the supported value is indeterminate (e.g. dependent on memory space). */ /* * Max length of arguments for exec() in bytes, including environ data, >= 4096. */ #define ARG_MAX 24576 #define MAX_CANON 256 /* max bytes in a terminal canonical input line, >= 256 */ #define CHILD_MAX 128 /* maximum processes per uid */ #define OPEN_MAX 32767 /* max num of files per process */ #define STREAM_MAX 32767 /* This value MUST be the same as FOPEN_MAX in stdio.h */ #define PTHREAD_KEYS_MAX 450 /* MUST be the same as PTHREAD_KEYS_MAX computed in pthread.h */ #ifdef _LARGE_THREADS #define PTHREAD_THREADS_MAX 32767 #else #define PTHREAD_THREADS_MAX 512 /* MUST be the same as PTHREAD_THREADS_MAX in pthread.h */ #endif /* _LARGE_THREADS */ #ifdef _ALL_SOURCE #define PTHREAD_DATAKEYS_MAX PTHREAD_KEYS_MAX #endif /* _ALL_SOURCE */ #define TZNAME_MAX 255 #define TTY_NAME_MAX PATH_MAX /* max len TTY name */ /* These are the runtime limit names for POSIX 1003.1c Realtime */ /* Realtime is not supported */ #define AIO_LISTIO_MAX 4096 #define AIO_MAX 4096 #define AIO_PRIO_DELTA_MAX 0 #define DELAYTIMER_MAX _POSIX_DELAYTIMER_MAX #define MQ_OPEN_MAX _POSIX_MQ_OPEN_MAX #define MQ_PRIO_MAX _POSIX_MQ_PRIO_MAX #define RTSIG_MAX _POSIX_RTSIG_MAX #define SEM_NSEMS_MAX _POSIX_SEM_NSEMS_MAX #define SEM_VALUE_MAX _POSIX_SEM_VALUE_MAX #define SIGQUEUE_MAX _POSIX_SIGQUEUE_MAX #define TIMER_MAX _POSIX_TIMER_MAX /* PATH NAME VARIABLE VALUES */ /* The value of NAME_MAX must be retrieved by a call to the pathconf() or * fpathconf() functions. */ #undef NAME_MAX /* max bytes in a file name (not a string length; does not include a terminating null) */ #define PATH_MAX 1023 /* max number of bytes in a pathname. (not string length; doesn't include a terminating null */ /* RUN-TIME INCREASABLE VALUES The following values are the minimum supported by this system. A specific instance of this system may support larger values. */ #define LINK_MAX SHRT_MAX /* max of a file's ilink counts, >= 8 */ #define LOGIN_NAME_MAX 9 /* max login name inc. null */ #define PIPE_BUF 32768 /* max number of bytes that is guaranteed to be atomic when writing to a pipe, >= 512 */ #endif /* _POSIX_SOURCE */ #ifdef _XOPEN_SOURCE /* Some of the value in are required in limits.h by XPG3, but are not allowed by Posix.1. The include must remain in _XOPEN_SOURCE. */ #ifdef _ALL_SOURCE #ifndef _H_FLOAT #include /* FLT_MAX, FLT_MIN, DBL_MAX, FLT_DIG, DBL_DIG */ #endif /* SFPMIN, SFPMAX, DFPMAX, DBL_MIN, DFPMIN */ #else #ifndef DBL_DIG #define DBL_DIG 15 #endif #ifndef FLT_DIG #define FLT_DIG 6 #endif #ifndef DBL_MAX #define DBL_MAX 1.7976931348623158e+308 /* max decimal value of a double */ #endif #ifndef FLT_MAX #define FLT_MAX 3.4028234663852886e+38F /* max decimal value of a float */ #endif #if (_XOPEN_SOURCE != 500) #ifndef DBL_MIN #define DBL_MIN 2.2250738585072014e-308 #endif #ifndef FLT_MIN #define FLT_MIN 1.1754943508222875e-38F /* min decimal value of a float */ #endif #endif /* _XOPEN_SOURCE != 500 */ #endif /* _ALL_SOURCE */ /* ANSI C requires TMP_MAX to be in stdio.h, however, XOPEN requires it to be * in limits.h. */ #ifndef TMP_MAX #define TMP_MAX 16384 /* The number of unique names generated by the tmpnam() function */ #endif /* TMP_MAX */ /* defines for message catalog usage */ #define NL_ARGMAX 9 /* max number of printf args */ #define NL_MSGMAX 65535 /* max number of messages per set */ #define NL_SETMAX 65535 /* max number of set per catalog */ #define NL_TEXTMAX 8192 /* max message length in bytes */ #define PASS_MAX 32 /* max number of bytes in a password (not a string length; doesn't include terminating null), >= 32 */ #define NL_LANGMAX 14 /* max number of of bytes in a LANG name */ #define NL_NMAX 10 /* max number of bytes in N-to-1 mapping characters */ #ifndef NZERO #define NZERO 20 /* default process priority */ #endif /* NZERO */ #ifdef __64BIT__ #define LONG_BIT 64 /* number of bits in a long */ #else #define LONG_BIT 32 /* number of bits in a long */ #endif #define WORD_BIT 32 /* number of bits in a "word" or int */ #define CHARCLASS_NAME_MAX 14 /* Maximum # of bytes in a character class name */ #if _XOPEN_SOURCE_EXTENDED==1 #define ATEXIT_MAX 2048 /* max num of registered functions for atexit() function, also defined in stdlib.h */ #define _XOPEN_IOV_MAX 16 /* Maximum number of iov's on readv() */ /* or writev() */ #ifndef IOV_MAX /* Also Defined in sys/uio.h */ #define IOV_MAX _XOPEN_IOV_MAX #endif /* IOV_MAX */ #define PAGE_SIZE 4096 /* page size granularity of memory */ #define PAGESIZE PAGE_SIZE #if _XOPEN_SOURCE==500 #undef FILESIZEBITS /* # bits needed to hold file offset, undef means must get from pathconf() */ #ifndef PTHREAD_STACK_MIN #ifdef _AIX_PTHREADS_D7 #define PTHREAD_STACK_MIN ( PAGESIZE * 24 ) /* Must be a multiple of 16k */ #else /* _AIX_PTHREADS_D7 */ #ifdef __64BIT__ #define PTHREAD_STACK_MIN ( 2 * PAGESIZE * 2 ) #else /* __64BIT__ */ #define PTHREAD_STACK_MIN ( PAGESIZE * 2 ) #endif /* __64BIT */ #endif /* _AIX_PTHREADS_D7 */ #endif /* PTHREAD_STACK_MIN */ #define PTHREAD_DESTRUCTOR_ITERATIONS _POSIX_THREAD_DESTRUCTOR_ITERATIONS /* # tries to destroy thread- specific data values on exit */ #endif /* _XOPEN_SOURCE==500 */ #endif /* _XOPEN_SOURCE_EXTENDED */ #endif /* _XOPEN_SOURCE */ #ifdef _ALL_SOURCE /* Asynchronous I/O limits. */ #define AIO_PRIO_DFL 1 #define AIO_PRIO_MAX 1 #define AIO_PRIO_MIN 1 #define AIO_LISTIO_MAX_SIZE AIO_LISTIO_MAX #define PID_MAX INT_MAX /* max value for a process ID, >=30000 */ #define UID_MAX UINT_MAX /* max value for a user or group ID */ #ifdef _LONG_LONG /* * Support for 64-bit integers, called long long int and unsigned long long int * -(2**63) = -9,223,372,036,854,775,808 * 2**63 - 1 = +9,223,372,036,854,775,807 * 2**64 - 1 = +18,446,744,073,709,551,616 */ #define LONGLONG_MAX (0x7fffffffffffffffLL) #define LONGLONG_MIN (-LONGLONG_MAX - 1) #define ULONGLONG_MAX (0xffffffffffffffffuLL) /* * File offset limits. */ /* DEV_OFF_MAX is not intended to be used by user applications */ #ifdef __64BIT_KERNEL #define DEV_OFF_MAX LONGLONG_MAX #else #define DEV_OFF_MAX 0xffffffffffLL #endif #endif /* _LONG_LONG */ #define OFF_MAX 0x7fffffff /* Max size of a regular file 2^31 -1 */ #endif /*_ALL_SOURCE */ #ifdef __cplusplus } #endif #endif /* _H_LIMITS */