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Full Discussion: Change value for POSIX
Top Forums UNIX for Advanced & Expert Users Change value for POSIX Post 303002702 by Don Cragun on Thursday 31st of August 2017 01:45:07 AM
Old 08-31-2017
You have not given any reason why _POSIX_ARG_MAX should be changed in the standards. Why are you trying to restrict your code to the smallest argument list size guaranteed to be available on every system instead of using the resources that your system tells you are available on your system? There is no reason to restrict yourself to the value of _POSIX_ARG_MAX in <limits.h>. Just restrict yourself to the value of ARG_MAX in <limits.h> on your system (which you have shown us is 2093093 bytes, approximately 2Mb - 4Kb). Or, assuming that there aren't huge variations in the size of each argument, just use 250k arguments on 2 invocations instead of 175 arguments on a little under 3000 invocations.

Or, if you're using shell instead of C to invoke commands with varying numbers of arguments based on the limits of your system, find ... -exec utility initial_arg... {} + and xargs are perfectly capable of performing these calculations without your script needing to care about the limits.
 

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XPRINTF(3)						   BSD Library Functions Manual 						XPRINTF(3)

NAME
asxprintf, dxprintf, fxprintf, sxprintf, xprintf, vasxprintf, vdxprintf, vfxprintf, vsxprintf, vxprintf -- extensible printf SYNOPSIS
#include <printf.h> int asxprintf(char ** restrict ret, printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, ...); int dxprintf(int fd, printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, ...); int fxprintf(FILE * restrict stream, printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, ...); int sxprintf(char * restrict str, size_t size, printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, ...); int xprintf(printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, ...); #include <stdarg.h> int vasxprintf(char ** restrict ret, printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, va_list ap); int vdxprintf(int fd, printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, va_list ap); int vfxprintf(FILE * restrict stream, printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, va_list ap); int vsxprintf(char * restrict str, size_t size, printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, va_list ap); int vxprintf(printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, va_list ap); DESCRIPTION
These extensible printf (see xprintf(5)) variants behave like their normal printf counterparts (see printf(3)) without 'x' in the name (except sxprintf() and vsxprintf() behave like snprintf() and vsnprintf(), respectively). The domain argument must be a pointer to a printf domain structure, as returned by one of the functions described in xprintf_domain(3). The loc argument should be an extended locale (see xlocale(3)) or NULL, which means to use the current locale in effect (either the per-thread locale if set, or the global locale by default). SEE ALSO
printf(3), xlocale(3), xprintf_domain(3), xprintf(5) Darwin Aug 19, 2012 Darwin
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