limits.5 (2010 09)

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limits(5) limits(5)
Number of bits in a longLONG_BIT 32 +
Max decimal value of a longLONG_MAX 2147483647 +
Min decimal value of a longLONG_MIN -2147483648 -
Max number of bytes in terminal canonical
input line
MAX_CANON 512 +*
Max number of bytes in terminal input queue
MAX_CHAR MAX_INPUT =*
Max number of bytes in terminal input queue
MAX_INPUT 512 +*
Max number of bytes in a path name com-
ponent
NAME_MAX 14 +*
Max value of "digits" in calls to the NLS
printf(3S) and scanf(3S) functions
NL_ARGMAX 9=
Max message number in an NLS message cata-
log
NL_MSGMAX 32767 +
Max set number in an NLS message catalog
NL_SETMAX 255 +
Max number of bytes in an NLS message string
NL_TEXTMAX 8192 +
Max number of supplementary groups per pro-
cess
NGROUPS_MAX 20 ++
Max number of files a process can have openOPEN_MAX 60 +*
Max number of chars in a passwordPASS_MAX 8+
Max number of characters in a path name
excluding the null terminator
PATH_MAX 1023 +*
Max value for a process IDPID_MAX 30000 +
Max number of bytes atomic in write to a pipePIPE_BUF 8192 +*
Max number of bytes writable to a pipe in one
write
PIPE_MAX INT_MAX +
Max number of simultaneous processes on sys-
tem
PROC_MAX 84 +-*
Max integer value of a signed charSCHAR_MAX 127 =
Min integer value of a signed charSCHAR_MIN -128 =
Max decimal value of a shortSHRT_MAX 32767 +
Min decimal value of a shortSHRT_MIN -32768 -
Number of bytes in a physical I/O blockSTD_BLK 512 +
Max process ID of system processesSYSPID_MAX 4 +-*
Length of strings returned by uname(2)SYS_NMLN 8+*
Max number of files open on systemSYS_OPEN 120 +-*
Max number of unique names generated by
tmpnam(3S)
TMP_MAX 17576 +
Max integer value of an unsigned charUCHAR_MAX 255 =
Smallest unattainable value for a user or group
ID
UID_MAX 2147483647 +
Max decimal value of an unsigned intUINT_MAX 4294967295 +
Max decimal value of an unsigned longULONG_MAX 4294967295 +
Max decimal value of an unsigned shortUSHRT_MAX 65535 +
Max decimal value of an unsigned intUSI_MAX UINT_MAX =*
Number of bits in a "word" (int)WORD_BIT 32 +
EXAMPLES
UID_MAX has an HP-UX value of 2147483647 +, which means that on all HP-UX systems the smallest
unattainable value for a user or group ID is at least 2147483647. A particular system might be capable of
supporting more than 2147483647 user or group IDs, in which case its <limits.h> file sets UID_MAX
to a higher value; however, any application assuming such a higher value is not guaranteed to be portable
to all HP-UX systems.
NGROUPS_MAX has an HP-UX value of 20 ++, which means that on all HP-UX systems the smallest
maximum number of supplementary groups per process is at least 20. A particular system might be capa-
ble of supporting more than 20 supplementary groups per process, in which case
sysconf(_SC_NGROUPS_MAX) will return a larger value than that specified in <limits.h>;
2 Hewlett-Packard Company − 2 − HP-UX 11i Version 3: September 2010