Man page 9 : proc_dointvec_minmax

proc_dointvec_minmax - read a vector of integers with min/max values

int proc_dointvec_minmax(struct ctl_table *  table , int  write , void __user *  buffer , size_t *  lenp , loff_t *  ppos );

table
    the sysctl table

write
     TRUE if this is a write to the sysctl file

buffer
    the user buffer

lenp
    the size of the user buffer

ppos
    file position

Reads/writes up to table->maxlen/sizeof(unsigned int) integer values from/to the user buffer, treated as an ASCII string.

This routine will ensure the values are within the range specified by table->extra1 (min) and table->extra2 (max).

Returns 0 on success.