suse man page for strict_strtoul

STRICT_STRTOUL(9)					     Basic C Library Functions						 STRICT_STRTOUL(9)

NAME
       strict_strtoul - convert a string to an unsigned long strictly

SYNOPSIS
       int strict_strtoul(const char * cp, unsigned int base, unsigned long * res);

ARGUMENTS
       cp
	   The string to be converted

       base
	   The number base to use

       res
	   The converted result value

DESCRIPTION
       strict_strtoul converts a string to an unsigned long only if the string is really an unsigned long string, any string containing any
       invalid char at the tail will be rejected and -EINVAL is returned, only a newline char at the tail is acceptible because people generally

CHANGE A MODULE PARAMETER IN THE FOLLOWING WAY
       echo 1024 > /sys/module/e1000/parameters/copybreak

       echo will append a newline to the tail.

       It returns 0 if conversion is successful and *res is set to the converted value, otherwise it returns -EINVAL and *res is set to 0.

       simple_strtoul just ignores the successive invalid characters and return the converted value of prefix part of the string.

COPYRIGHT
Kernel Hackers Manual 2.6.					     July 2010							 STRICT_STRTOUL(9)