optstr_get(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

GETFSSTAT(2)						      BSD System Calls Manual						      GETFSSTAT(2)

NAME

     getfsstat -- get list of all mounted file systems

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <sys/param.h>
     #include <sys/ucred.h>
     #include <sys/mount.h>

     int
     getfsstat(struct statfs *buf, long bufsize, int flags);

DESCRIPTION

     The getfsstat() system call returns information about all mounted file systems.  The buf argument is a pointer to statfs structures, as
     described in statfs(2).

     Fields that are undefined for a particular file system are set to -1.  The buffer is filled with an array of statfs structures, one for each
     mounted file system up to the byte count specified by bufsize.  Note, the bufsize argument is the number of bytes that buf can hold, not the
     count of statfs structures it will hold.

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

     Normally flags should be specified as MNT_WAIT.  If flags is set to MNT_NOWAIT, getfsstat() will return the information it has available
     without requesting an update from each file system.  Thus, some of the information will be out of date, but getfsstat() will not block wait-
     ing for information from a file system that is unable to respond.

RETURN VALUES

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

ERRORS

     The getfsstat() system call fails if one or more of the following are true:

     [EFAULT]		The buf argument points to an invalid address.

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

SEE ALSO

     statfs(2), fstab(5), mount(8)

HISTORY

     The getfsstat() system call first appeared in 4.4BSD.

BSD
								 November 20, 2003							       BSD