STRICT_STRTOULL

Section: Basic C Library Functions (9)
Updated: February 2011
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NAME

strict_strtoull - convert a string to an unsigned long long strictly

SYNOPSIS

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

ARGUMENTS

: The string to be converted

base

: The number base to use

res

: The converted result value

DESCRIPTION

strict_strtoull converts a string to an unsigned long long only if the string is really an unsigned long 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 of the string.

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.