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extern char *optarg;

extern int optind, opterr, optopt;
 

           const char *optstring,

           const struct option *longopts, int *longindex);

optstring is a string containing the legitimate option characters. If such a character is followed by a colon, the option requires an argument, so getopt() places a pointer to the following text in the same argv-element, or the text of the following argv-element, in optarg. Two colons mean an option takes an optional arg; if there is text in the current argv-element (i.e., in the same word as the option name itself, for example, "-oarg"), then it is returned in optarg, otherwise optarg is set to zero. This is a GNU extension. If optstring contains W followed by a semicolon, then -W foo is treated as the long option --foo. (The -W option is reserved by POSIX.2 for implementation extensions.) This behavior is a GNU extension, not available with libraries before glibc 2. 
 

err = snd_output_stdio_attach(&output, stdout, 0);

if (err < 0) {

        printf("Output failed: %s\n", snd_strerror(err));

        return 0;

}
 

void showstat(snd_pcm_t *handle, size_t frames)

{

        int err;

        snd_pcm_status_t *status;

        snd_pcm_status_alloca(&status);

        if ((err = snd_pcm_status(handle, status)) < 0) {

                printf("Stream status error: %s\n", snd_strerror(err));

                exit(0);

        }

        printf("*** frames = %li ***\n", (long)frames);

        snd_pcm_status_dump(status, output);

`configure' configures this package to adapt to many kinds of systems.

Usage: ./configure [OPTION]... [VAR=VALUE]...

To assign environment variables (e.g., CC, CFLAGS...), specify them as

VAR=VALUE.  See below for descriptions of some of the useful variables.

Defaults for the options are specified in brackets.

Configuration:

  -h, --help              display this help and exit

      --help=short        display options specific to this package

      --help=recursive    display the short help of all the included packages

  -V, --version           display version information and exit

  -q, --quiet, --silent   do not print `checking ...' messages

      --cache-file=FILE   cache test results in FILE [disabled]

  -C, --config-cache      alias for `--cache-file=config.cache'

  -n, --no-create         do not create output files

      --srcdir=DIR        find the sources in DIR [configure dir or `..']

Installation directories:

  --prefix=PREFIX         install architecture-independent files in PREFIX

                          [/usr]

  --exec-prefix=EPREFIX   install architecture-dependent files in EPREFIX

                          [PREFIX]

By default, `make install' will install all the files in

`/usr/bin', `/usr/lib' etc.  You can specify

an installation prefix other than `/usr' using `--prefix',

for instance `--prefix=$HOME'.

For better control, use the options below.

Fine tuning of the installation directories:

  --bindir=DIR            user executables [EPREFIX/bin]

  --sbindir=DIR           system admin executables [EPREFIX/sbin]

  --libexecdir=DIR        program executables [EPREFIX/libexec]

  --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]

  --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]

  --localstatedir=DIR     modifiable single-machine data [PREFIX/var]

  --libdir=DIR            object code libraries [EPREFIX/lib]

  --includedir=DIR        C header files [PREFIX/include]

  --oldincludedir=DIR     C header files for non-gcc [/usr/include]

  --datarootdir=DIR       read-only arch.-independent data root [PREFIX/share]

  --datadir=DIR           read-only architecture-independent data [DATAROOTDIR]

  --infodir=DIR           info documentation [DATAROOTDIR/info]

  --localedir=DIR         locale-dependent data [DATAROOTDIR/locale]

  --mandir=DIR            man documentation [DATAROOTDIR/man]

  --docdir=DIR            documentation root [DATAROOTDIR/doc/PACKAGE]

  --htmldir=DIR           html documentation [DOCDIR]

  --dvidir=DIR            dvi documentation [DOCDIR]

  --pdfdir=DIR            pdf documentation [DOCDIR]

  --psdir=DIR             ps documentation [DOCDIR]

Program names:

  --program-prefix=PREFIX            prepend PREFIX to installed program names

  --program-suffix=SUFFIX            append SUFFIX to installed program names

  --program-transform-name=PROGRAM   run sed PROGRAM on installed program names

System types:

  --build=BUILD     configure for building on BUILD [guessed]

  --host=HOST       cross-compile to build programs to run on HOST [BUILD]

Optional Features:

  --disable-option-checking  ignore unrecognized --enable/--with options

  --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)

  --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]

  --disable-dependency-tracking  speeds up one-time build

  --enable-dependency-tracking   do not reject slow dependency extractors

  --enable-shared[=PKGS]  build shared libraries [default=yes]

  --enable-static[=PKGS]  build static libraries [default=yes]

  --enable-fast-install[=PKGS]

                          optimize for fast installation [default=yes]

  --disable-libtool-lock  avoid locking (might break parallel builds)

  --disable-pcm           disable PCM interface

  --disable-mixer         disable mixer interface

  --enable-rawmidi        enable rawmidi interface

  --enable-hwdep          enable hwdep interface

  --enable-timer          enable timer interface

  --enable-conf           enable dummy conf functions

  --enable-seq            enable seq functions

  --enable-tlv            enable TLV (dB) support

  --disable-user-elem     disable user-space control element support

  --enable-async          enable async handler support

  --enable-libasound      build a ABI-compatible libasound.so

  --disable-deprecated    don't mark deprecated attribute for non-working

                          functions

  --enable-output-buffer  support the string output via snd_output_*()

                          functions

  --disable-delight-valgrind

                          do not initialize unnecessary fields for ioctls

  --disable-symbolic-functions

                          use -Bsymbolic-functions option if available

                          (optmization for size and speed)

  --enable-float          support floatin-point unit

  --disable-4bit          drop the support for 4bit PCM (IMA ADPCM)

  --enable-abicheck       enable library ABI check

  --enable-everything     enable everything :)

Optional Packages:

  --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]

  --without-PACKAGE       do not use PACKAGE (same as --with-PACKAGE=no)

  --with-gnu-ld           assume the C compiler uses GNU ld [default=no]

  --with-pic              try to use only PIC/non-PIC objects [default=use

                          both]

  --with-tags[=TAGS]      include additional configurations [automatic]

  --with-compat-version=VERSION

                          specify the compatible version with ALSA-lib

                          (default=1.0.25)

  --with-alsa-devdir=dir  directory with ALSA device files (default /dev/snd)

Some influential environment variables:

  CC          C compiler command

  CFLAGS      C compiler flags

  LDFLAGS     linker flags, e.g. -L<lib dir> if you have libraries in a

              nonstandard directory <lib dir>

  LIBS        libraries to pass to the linker, e.g. -l<library>

  CPPFLAGS    (Objective) C/C++ preprocessor flags, e.g. -I<include dir> if

              you have headers in a nonstandard directory <include dir>

  CPP         C preprocessor

  CXX         C++ compiler command

  CXXFLAGS    C++ compiler flags

  CXXCPP      C++ preprocessor

  F77         Fortran 77 compiler command

  FFLAGS      Fortran 77 compiler flags

Use these variables to override the choices made by `configure' or to help

it to find libraries and programs with nonstandard names/locations.