STRICT_STRTOULL - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Basic C Library Functions

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NAMEstrict_strtoull − convert a string to an unsigned long long strictly

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

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ARGUMENTScp The string to be converted base The number base to use res The converted result value

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DESCRIPTIONstrict_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

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CHANGE A MODULE PARAMETER IN THE FOLLOWING WAYecho 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​. simple_strtoull just ignores the successive invalid characters and return the converted value of prefix part of the string​.

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