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OPTSTR(9) NetBSD Kernel Developer's Manual OPTSTR(9)
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optstr_get -- Options string management
optstr_get(const char *optstr, const char *key, char *buf,
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
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.
The options string management functions are implemented within the files
sys/kern/subr_optstr.c and sys/sys/optstr.h.
Options strings appeared in NetBSD 4.0.
NetBSD 9.99 August 11, 2007 NetBSD 9.99