maximum number of arguments Post: 302141257

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Top Forums UNIX for Dummies Questions & Answers maximum number of arguments Post 302141257 by jim mcnamara on Thursday 18th of October 2007 09:52:11 AM

10-18-2007

Registered User

POSIX_LINE_MAX or LINE_MAX talks about the max length of records that can be read in by utilities like awk.

According to POSIX:

Quote:

{ARG_MAX}
Maximum length of argument to the exec functions including environment data.
Minimum Acceptable Value: {_POSIX_ARG_MAX}

which is what Porter was talking about earlier.

Short answer: For POSIX, it is not the number of arguments, but the total size of data (arguments and env) that invokes a limit. This is why you see results that vary.

Plus you shoud try:

Code:

total=$(( `set | wc -c`  + ` set | wc -l `))

and substract that value from ARG_MAX in limits.h to see how much space your arguments have left to occupy. Each argument and each environment variable has overhead, possibly alignment overhead, and definitely trailing nuls for strings.

Environment variables are stored like this in memory

Code:

ENV_variable_name=some value\000

jim mcnamara

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LEARN ABOUT HPUX

fmaxl

fmax(3M)																  fmax(3M)

NAME

       fmax(), fmaxf(), fmaxl(), fmaxw(), fmaxq() - maximum value functions

SYNOPSIS

   HP Integrity Server Only
DESCRIPTION

       The function determines the maximum numeric value of its arguments.

   Integrity Server Only
       is a version of it takes arguments and returns a result.

       is a version of it takes arguments and returns a result.

       is an version of it takes arguments and returns an result.

       is equivalent to on HP-UX systems.

USAGE

       To  use	this function, compile either with the default option or with the and options.	To use (for Integrity servers) or compile with the
       option.	Make sure your program includes Link in the math library by specifying on the compiler or linker command line.

RETURN VALUE

       The function returns the maximum numeric value of its arguments.

       If one argument is a NaN and the other is numeric, returns the numeric argument.

       If both arguments are NaNs, returns NaN.

ERRORS

       No errors are defined.

SEE ALSO

       fdim(3M), fmin(3M), math(5).

STANDARDS CONFORMANCE

       : ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')

																	  fmax(3M)