LIBBSD(7)            BSD Miscellaneous Information Manual            LIBBSD(7)

     libbsd -- utility functions from BSD systems

     The libbsd library provides a set if compatibility macros and functions
     commonly found on BSD-based systems.  Its purpose is to make those avail-
     able on non-BSD based systems to ease portability.

     The library can be used in an overlay mode, which is the preferred way,
     so that the code is portable and requires no modification to the original
     BSD code.  This can be done easily with the pkg-config(3) library named
     libbsd-overlay.  Or by adding the system-specific include directory with
     the bsd/ suffix to the list of system include paths.  With gcc this could
     be -isystem ${includedir}/bsd.  In addition the LIBBSD_OVERLAY pre-pro-
     cessor variable needs to be defined.  The includes in this case should be
     the usual system ones, such as <unistd.h>.

     The other way to use the library is to use the namespaced headers, this
     is less portable as it makes using libbsd mandatory and it will not work
     on BSD-based systems, and requires modifying original BSD code.  This can
     be done with the pkg-config(3) library named libbsd.  The includes in
     this case should be namespaced with bsd/, such as <bsd/unistd.h>.

     The package also provides a bsd-ctor static library that can be used to
     inject automatic constructors into a program so that the setproctitle()
     function gets invoked automatically at startup time.  This can be done
     with the pkg-config(3) library named libbsd-ctor.

     The following are the headers provided by libbsd, that extend the stan-
     dard system headers.  They can work in normal or overlay modes, for the
     former they need to be prefixed with bsd/.


     The following is a libbsd specific convenience header, that includes some
     of the extended headers.  It only works in non-overlay mode.


     Some functions have been deprecated, they will emit warnings at compile
     time and possibly while being linked at run-time.  This might be due to
     the functions not being portable at all to other systems, making the
     package not buildable there; not portable in a correct or non-buggy way;
     or because there are better more portable replacements now.

     This is the list of currently deprecated macros and functions:

           Unportable, requires assistance from the stdio layer.  An implemen-
           tation has to choose between leaking buffers or being reentrant for
           a limited amount of streams (this implementation chose the latter
           with a limit of 32).  Use getline(3) instead, which is available in
           many systems and required by IEEE Std 1003.1-2008 (``POSIX.1'').

           Unportable, requires assistance from the stdio layer or some hook
           framework.  On GNU systems the fopencookie() function can be used.
           Otherwise the code needs to be prepared for neither of these func-
           tions being available.

     Some functions have been superseded by implementations in other system
     libraries, and might disappear on the next SONAME bump, assuming those
     other implementation have widespread deployment, or the implementations
     are present in all major libc for example.

           The set of MD5 digest functions are now provided by the libmd com-
           panion library, so it is advised to use that instead.
           This function is provided by glibc 2.25.
           This function is provided by glibc 2.26.

     arc4random(3bsd), bitstring(3bsd), byteorder(3bsd), closefrom(3bsd),
     errc(3bsd), expand_number(3bsd), explicit_bzero(3bsd), fgetln(3bsd),
     fgetwln(3bsd), flopen(3bsd), fmtcheck(3bsd), fparseln(3bsd),
     fpurge(3bsd), funopen(3bsd), getbsize(3bsd), getpeereid(3bsd),
     getprogname(3bsd), heapsort(3bsd), humanize_number(3bsd), md5(3bsd),
     nlist(3bsd), pidfile(3bsd), queue(3bsd), radixsort(3bsd),
     readpassphrase(3bsd), reallocarray(3bsd), reallocf(3bsd), setmode(3bsd),
     setproctitle(3bsd), stringlist(3bsd), strlcpy(3bsd), strmode(3bsd),
     strnstr(3bsd), strtonum(3bsd), timeradd(3bsd), timeval(3bsd), tree(3bsd),
     unvis(3bsd), vis(3bsd), wcslcpy(3bsd).

     The libbsd project started in the Debian GNU/kFreeBSD port as a way to
     ease porting code from FreeBSD to the GNU-based system.  Pretty early on
     it was generalized and a project created on for other
     distributions and projects to use.

     It is now distributed as part of most non-BSD distributions.

BSD                               May 31 2017                              BSD

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