optstr(9) [netbsd man page]

OPTSTR(9)						   BSD 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.

BSD
								  August 11, 2007							       BSD

GETVFSSTAT(2)						      BSD System Calls Manual						     GETVFSSTAT(2)

NAME

     getvfsstat -- get list of all mounted file systems

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <sys/types.h>
     #include <sys/statvfs.h>

     int
     getvfsstat(struct statvfs *buf, size_t bufsize, int flags);

DESCRIPTION

     getvfsstat() returns information about all mounted file systems.  buf is a pointer to an array of statvfs structures defined in statvfs(5).

     The buffer is filled with an array of statvfs structures, one for each mounted file system up to the size specified by bufsize.

     If buf is given as NULL, getvfsstat() returns just the number of mounted file systems.

     Normally flags should be specified as ST_WAIT.  If flags is set to ST_NOWAIT, getvfsstat() will return the information it has available with-
     out requesting an update from each file system.  Thus, some of the information will be out of date, but getvfsstat() will not block waiting
     for information from a file system that is unable to respond.

RETURN VALUES

     Upon successful completion, the number of statvfs structures is returned.	Otherwise, -1 is returned and the global variable errno is set to
     indicate the error.

ERRORS

     getvfsstat() fails if one or more of the following are true:

     [EFAULT]		buf points to an invalid address.

     [EIO]		An I/O error occurred while reading from or writing to the file system.

SEE ALSO

     statvfs(2), getmntinfo(3), fstab(5), mount(8)

HISTORY

     The getvfsstat() function first appeared in NetBSD 3.0 to replace getfsstat() which appeared in 4.4BSD.

BSD
								   May 19, 2006 							       BSD