limits(5)							File Formats Manual							 limits(5)

Name
       limits - header files for implementation-specific constants

Syntax
       #include <limits.h>
       #include <float.h>

Description
       The  header  file  <limits.h> specifies the sizes of integral types as required by the proposed ANSI C standard.  The header file <float.h>
       specifies the characteristics of floating types as required by the proposed ANSI C standard.  The constants that refer to long doubles that
       should appear in <float.h> are not specified because RISC does not implement long doubles.

       The file <limits.h> contains the following:
       #define	CHAR_BIT  8	    /* # of bits in a `char'		  */
       #define	SCHAR_MIN (-128)    /* min integer value of a `signed	  */
				    /* char'				  */
       #define	SCHAR_MAX (+127)    /* max integer value of a `signed	  */
				    /* char'				  */
       #define	UCHAR_MAX 255	    /* max integer value of `unsigned	  */
				    /* char'				  */
       #define	CHAR_MIN  (-128)    /* min integer value of a `char'	  */
       #define	CHAR_MAX  (+127)    /* max integer value of a `char'	  */
       #define	SHRT_MIN  (-32768)  /* min decimal value of a `short'	  */
       #define	SHRT_MAX  (+32767)  /* max decimal value of a `short'	  */
       #define	USHRT_MAX 65535     /* max decimal value of `unsigned	  */
				    /* short'				  */
       #define	INT_MIN   (-2147483648) /* min decimal value of an `int'  */
       #define	INT_MAX   (+2147483647) /* max decimal value of a `int'   */
       #define	UINT_MAX  4294967295  /* max decimal value of `unsigned   */
				      /* int'				  */
       #define	LONG_MIN  (-2147483648) /* min decimal value of a `long'  */
       #define	LONG_MAX  (+2147483647) /* max decimal value of a `long'  */
       #define	ULONG_MAX 4294967295  /* max decimal value of `unsigned   */
				      /* long'				  */
       #define	USI_MAX  4294967295    /* max decimal value of `unsigned' */
       #define	WORD_BIT   32		 /* # of bits in a ``word'' or	  */
					 /* `int'			  */
       #define CHILD_MAX       25	/* max # of processes per user id */
       #define CLK_TCK 60		/* # of clock ticks per second	  */
       #define LOCK_MAX    0   */ max # of entries in system		  */
			      /* lock table				  */
       #define LINK_MAX        32766	/* max # of links to a single	  */
					/* file 			  */
       #define LONG_BIT        32	/* # of bits in a "long" (X/OPEN) */
       #define NAME_MAX        255  /* max # of characters in a file name */
       #define NGROUPS_MAX     32	       /* max # of groups	  */
       #define MAX_INPUT       256	 /* max # of bytes in terminal	  */
					 /* input queue 		  */
       #define MAX_CANON       256	 /* max # of bytes in term canon  */
					 /* input line			  */
       #define MAX_CHAR        256	 /* max # of bytes in term canon  */
					 /* input line (X/OPEN) 	  */
       #define OPEN_MAX        64	/* max # of files a process can   */
					/* have open			  */
       #define PASS_MAX        8	/* max # of characters in	  */
					/* a password			  */
       #define PATH_MAX        1024	/* max # of characters in	  */
					/* a path name			  */
       #define PID_MAX	       30000	/* max value for a process ID	  */
       #define SYSPID_MAX      2	/* max value for a system	  */
					/* proc ID (X/OPEN)		  */
       #define PIPE_BUF        4096	/* max # bytes atomic in	  */
					/* write to pipe		  */
       #define PIPE_MAX        4096	/* max # bytes written to a	  */
					/* pipe in a write		  */

       #define PROC_MAX        100    /* max # of simultaneous processes  */
       #define STD_BLK	       8192   /* # bytes in a physical I/O block  */
       #define SYS_NMLN        32 /* # of chars in uname-returned strings */
       #define SYS_OPEN        200 /* max # of files open on system	  */
       #define TMP_MAX 17576 /* max # of calls to tmpnam(3S) before	  */
				/* recycling of names occurs		  */
       #define UID_MAX	       32000	/* max value for a user or group  */
					/* ID				  */
       #define NZERO 20
					/* default nice value (as seen	  */
				       /* by nice(3), not intrinsically)  */
       /*
	* Internationalization constants
	*/
       #define MB_LEN_MAX      1  /* max number of bytes in a multibyte   */
				  /* character, any locale: placeholder   */
       #define NL_ARGMAX       9  /* max value of digits in calls to	  */
				  /* nl_scanf(3S) and nl_printf(3S)	  */
       #define NL_MSGMAX       32767   /* max message number		  */
       #define NL_NMAX	       2    /* max n-to-1 bytes in mapping chars  */
       #define NL_SETMAX       255     /* max set number		  */
       #define NL_TEXTMAX      256     /* max no. of bytes in a message   */
				       /* string			  */
       #define NL_LBLMAX       32767   /* max number of labels		  */
				       /* in catalogue			  */
       #define NL_LANGMAX      32      /* max number of bytes in LANG	  */
				       /* name				  */
       /*
	*      POSIX minimum values
	*
	*      These values are the MINIMUM allowable by POSIX. Actual values
	*      for ULTRIX are defined above.
	*/
       #define _POSIX_ARG_MAX	4096   /* Length of arguments for	  */
				       /* exec( )			  */
       #define _POSIX_CHILD_MAX 6      /* Number of simultaneous	  */
				       /* procs per uid 		  */
       #define _POSIX_LINK_MAX	8      /* Number of file links		  */
       #define _POSIX_MAX_CANON 255    /* Number of bytes in		  */
				       /* a terminal canon		  */
				       /* input queue			  */
       #define _POSIX_MAX_INPUT 255    /* Number of bytes		  */
				       /* for which space is		  */
				       /* guaranteed in terminal	  */
				       /* input queue			  */
       #define _POSIX_NAME_MAX	14     /* Number of bytes in a filename   */
       #define _POSIX_NGROUPS_MAX 0    /* Number of allowable		  */
				       /* supplementary group ID's	  */
       #define _POSIX_OPEN_MAX	16     /* Number of files open at one	  */
				       /* time by a given process.	  */
       #define _POSIX_PATH_MAX	255    /* Number of bytes in a pathname   */
       #define _POSIX_PIPE_BUF	512    /* Number of bytes that is	  */
				       /* guaranteed to be written	  */
				       /* atomically when writing to	  */
				       /* a pipe.			  */

       The file <limits.h> contains the following values for RISC architecture:
       #define ARG_MAX	       20480   /* max length of arguments to exec */
       #define HUGE_VAL        1.8e+308 /* infinity			  */

       The file <limits.h> contains the following value for VAX architecture:
       #define ARG_MAX	       10240   /* max length of arguments to exec */

       The file <limits.h> contains the following value for VAX D-float architecture:
       #define HUGE_VAL        1.701411834604692293e+38

       The file <limits.h> contains the following value for VAX G-float architecture:
       #define HUGE_VAL        8.9884656743115790e+307

       The file <float.h> contains the following values for RISC architecture:
       #define	FLT_RADIX  2 /* radix of exponent representation	  */
       #define	FLT_ROUNDS  1 /* addition rounds			  */
			      /* (>0 implementation-defined)		  */
       /* number of base-FLT_RADIX digits in the floating point mantissa  */
       #define	FLT_MANT_DIG  24
       #define	DBL_MANT_DIG  53
       /* minimum positive floating-point number x such that		  */
       /* 1.0 + x < > 1.0						 */
       #define	FLT_EPSILON  1.19209290e-07
       #define	DBL_EPSILON  2.2204460492503131e-16
       /* number of decimal digits of precision 			  */
       #define	FLT_DIG  6
       #define	DBL_DIG  15
       /* minimum negative integer such that FLT_RADIX raised to that	  */
       /* power minus 1 is a normalized floating point number		  */
       #define	FLT_MIN_EXP  (-125)
       #define	DBL_MIN_EXP  (-1021)
       /* minimum normalized positive floating-point number		  */
       #define	FLT_MIN  1.17549435e-38
       #define	DBL_MIN  2.2250738585072014e-308
       /* minimum negative integer such that 10 raised to		  */
       /* that power is in the range of normalized floating-point numbers */
       #define	FLT_MIN_10_EXP	(-37)
       #define	DBL_MIN_10_EXP	(-307)
       /* maximum integer such that FLT_RADIX raised to that		  */
       /* power minus 1 is a representable finite floating-point number   */
       #define	FLT_MAX_EXP  +128
       #define	DBL_MAX_EXP  +1024
       /* maximum representable finite floating-point number		  */
       #define	FLT_MAX  3.40282347e+38
       #define	DBL_MAX  1.7976931348623157e+308
       /* maximum integer such that 10 raised to that power is in	  */
       /* the range of representable finite floating-point numbers	  */
       #define	FLT_MAX_10_EXP	38
       #define	DBL_MAX_10_EXP	308

       The file <float.h> contains the following values for VAX architecture:
       #define	FLT_RADIX  2 /* radix of exponent representation	  */
       #define	FLT_ROUNDS  1 /* addition rounds			  */
			      /* (>0 implementation-defined)		  */
       #define FLT_MIN_10_EXP  (-37)
       #define DBL_MIN_10_EXP  (-307)
       #define LDBL_MIN_10_EXP

       #define FLT_MANT_DIG 24
       #define FLT_EPSILON 5.96046448e-08
       #define FLT_DIG	6
       #define FLT_MIN_EXP  (-127)
       #define FLT_MIN float  2.93873588e-39
       #define FLT_MIN_10_EXP  (-38)
       #define FLT_MAX_EXP     127
       #define FLT_MAX 1.701411733192644299e+38
       #define FLT_MAX_10_EXP  380

       The file <float.h> contains the following values for VAX D-float:
       #define DBL_MANT_DIG    56
       #define DBL_EPSILON     1.3877787807814457e-17
       #define DBL_DIG 16
       #define DBL_MIN_EXP     (-127)
       #define DBL_MIN 2.93873587705571880e-39
       #define DBL_MIN_10_EXP  (-38)
       #define DBL_MAX_EXP     127
       #define DBL_MAX 1.701411834604692293e+38
       #define DBL_MAX_10_EXP  38

       The file <float.h> contains the following values for VAX G-float (cc - Mg):
       #define DBL_MANT_DIG    53
       #define DBL_EPSILON     1.1102230246251570e-016
       #define DBL_DIG 15
       #define DBL_MIN_EXP     (-1023)
       #define DBL_MIN 5.56268464626800350e-309
       #define DBL_MIN_10_EXP  (-308)
       #define DBL_MAX_EXP     1023
       #define DBL_MAX 8.9884656743115790e+307
       #define DBL_MAX_10_EXP  307

								       RISC								 limits(5)