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OPTSTR(9) 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 maximum 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 8.0 August 11, 2007 NetBSD 8.0