limits(4)
_________________________________________________________________
limits File Format
file header for implementation-specific constants
_________________________________________________________________
SYNTAX
#include <limits.h>
DESCRIPTION
The header file <limits.h> is a list of magnitude limitations
imposed by a specific implementation of the operating system.
All values are specified in decimal.
#define ARG_MAX 5120 /* max length of arguments to exec */
#define CHAR_BIT 8 /* # of bits in a "char" */
#define CHAR_MAX 255 /* max integer value of a "char" */
#define CHAR_MIN 0 /* min integer value of a "char" */
#define CHILD_MAX 25 /* max # of processes per user id */
#define CLK_TCK 100 /* # of clock ticks per second */
#define DBL_DIG 16 /* digits of precision of a "double" */
#define DBL_MAX 7.237005577332266e+75 /*max decimal value of a
"double"*/
#define DBL_MIN 5.397605346934028e-79 /*min decimal value of a
"double"*/
#define FCHR_MAX 2147483647 /* max size of a file in bytes */
#define FLT_DIG 7 /* digits of precision of a "float" */
#define FLT_MAX 7.23005145973118e+75 /*max decimal value of a
"float" */
#define FLT_MIN 5.397605346934028e-79 /*min decimal value of a
"float" */
#define HUGE_VAL 7.237005145973118e+75 /*error value returned by
Math lib*/
DG/UX 4.00 Page 1
Licensed material--property of copyright holder(s)
limits(4)
#define INT_MAX 2147483647 /* max decimal value of an "int" */
#define INT_MIN -2147483648 /* min decimal value of an "int"
*/
#define LINK_MAX 1000 /* max # of links to a single file */
#define LONG_MAX 2147483647 /* max decimal value of a "long" */
#define LONG_MIN -2147483648 /* min decimal value of a "long"
*/
#define NAME_MAX 255 /* max # of characters in a filename */
#define OPEN_MAX 20 /* max # of files a process can have open
*/
#define PASS_MAX 8 /* max # of characters in a password */
#define PATH_MAX 1023 /* max # of characters in a pathname */
#define PID_MAX 30000 /* max value for a process ID */
#define PIPE_BUF 5120 /* max # bytes atomic in write to a pipe
*/
#define PIPE_MAX 5120 /* max # bytes written to a pipe in a
write */
#define SHRT_MAX 32767 /* max decimal value of a "short" */
#define SHRT_MIN -32768 /* min decimal value of a "short" */
#define STD_BLK 512 /* # bytes in a physical I/O block */
#define SYS_NMLN 9 /* # of chars in uname-returned strings */
#define UID_MAX 60000 /* max value for a user or group id */
#define USI_MAX 4294967296 /* max decimal value of an
"unsigned" */
#define WORD_BIT 32 /* # of bits in a "word" or "int" */
DG/UX 4.00 Page 2
Licensed material--property of copyright holder(s)