optstr(9) - NetBSD Manual Pages

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OPTSTR(9)              NetBSD Kernel Developer's Manual              OPTSTR(9)


NAME

     optstr_get -- Options string management


SYNOPSIS

     #include <sys/optstr.h>

     bool
     optstr_get(const char *optstr, const char *key, char *buf,
         size_t bufsize);


DESCRIPTION

     An options string is a list of key/value pairs represented in textual
     form.  Each pair is expressed as `'key=value'' and is separated from
     other pairs by one or more spaces.  For example:

     key1=value1 key2=value2 key3=value3

     Options strings are used to pass information between userland programs
     and the kernel in a binary-agnostic way.  This makes them endianness and
     ABI independent.


FUNCTIONS

     The following functions are provided to manage options strings:

     optstr_get(optstr, key, buf, bufsize)
              Scans the optstr options string looking for the key key and
              stores its value in the buffer pointed to by buf copying a maxi-
              mum of bufsize bytes.  Returns `true' if the key was found or
              `false' otherwise, in which case buf is left unmodified.


CODE REFERENCES

     The options string management functions are implemented within the files
     sys/kern/subr_optstr.c and sys/sys/optstr.h.


HISTORY

     Options strings appeared in NetBSD 4.0.

NetBSD 5.1                      August 11, 2007                     NetBSD 5.1