* modules/fopen (Depends-on): Add 'largefile'.
* modules/freopen (Depends-on): Likewise.
* modules/fseeko (Depends-on): Likewise.
* modules/ftello (Depends-on): Likewise.
* modules/glob (Depends-on): Likewise.
* modules/lseek (Depends-on): Likewise.
* modules/lstat (Depends-on): Likewise.
* modules/mkostemp (Depends-on): Likewise.
* modules/mkostemps (Depends-on): Likewise.
* modules/mkstemp (Depends-on): Likewise.
* modules/mkstemps (Depends-on): Likewise.
* modules/open (Depends-on): Likewise.
* modules/openat (Depends-on): Likewise.
* modules/pread (Depends-on): Likewise.
* modules/pwrite (Depends-on): Likewise.
* modules/scandir (Depends-on): Likewise.
* modules/stat (Depends-on): Likewise.
* modules/tmpfile (Depends-on): Likewise.
* m4/mkstemp.m4 (gl_FUNC_MKSTEMP): Do not require AC_SYS_LARGEFILE,
since the containing module now depends on the largefile module.
* m4/tempname.m4 (gl_FUNC_GEN_TEMPNAME): Likewise.
* doc/posix-functions/fopen.texi: Mention that the problem of 32-bit
off_t is fixed by gnulib.
* doc/posix-functions/freopen.texi: Likewise.
* doc/posix-functions/fseeko.texi: Likewise.
* doc/posix-functions/fstatat.texi: Likewise.
* doc/posix-functions/ftello.texi: Likewise.
* doc/posix-functions/glob.texi: Likewise.
* doc/posix-functions/lseek.texi: Likewise.
* doc/posix-functions/lstat.texi: Likewise.
* doc/posix-functions/mkstemp.texi: Likewise.
* doc/posix-functions/open.texi: Likewise.
* doc/posix-functions/openat.texi: Likewise.
* doc/posix-functions/pread.texi: Likewise.
* doc/posix-functions/pwrite.texi: Likewise.
* doc/posix-functions/scandir.texi: Likewise.
* doc/posix-functions/stat.texi: Likewise.
* doc/posix-functions/tmpfile.texi: Likewise.
* doc/glibc-functions/mkostemp.texi: Likewise.
* doc/glibc-functions/mkostemps.texi: Likewise.
* doc/glibc-functions/mkstemps.texi: Likewise.

* m4/pread.m4 (gl_FUNC_PREAD): Move AC_LIBOBJ invocation from here...
* modules/pread (configure.ac): ... to here.

* modules/accept (Depends-on): Add conditions to the dependencies.
* modules/acosl (Depends-on): Likewise.
* modules/argz (Depends-on): Likewise.
* modules/asinl (Depends-on): Likewise.
* modules/atanl (Depends-on): Likewise.
* modules/atoll (Depends-on): Likewise.
* modules/bind (Depends-on): Likewise.
* modules/btowc (Depends-on): Likewise.
* modules/canonicalize-lgpl (Depends-on): Likewise.
* modules/ceil (Depends-on): Likewise.
* modules/ceilf (Depends-on): Likewise.
* modules/ceill (Depends-on): Likewise.
* modules/chdir-long (Depends-on): Likewise.
* modules/chown (Depends-on): Likewise.
* modules/close (Depends-on): Likewise.
* modules/connect (Depends-on): Likewise.
* modules/cosl (Depends-on): Likewise.
* modules/dirfd (Depends-on): Likewise.
* modules/dprintf (Depends-on): Likewise.
* modules/dprintf-posix (Depends-on): Likewise.
* modules/error (Depends-on): Likewise.
* modules/euidaccess (Depends-on): Likewise.
* modules/expl (Depends-on): Likewise.
* modules/faccessat (Depends-on): Likewise.
* modules/fchdir (Depends-on): Likewise.
* modules/fclose (Depends-on): Likewise.
* modules/fcntl (Depends-on): Likewise.
* modules/fdopendir (Depends-on): Likewise.
* modules/fflush (Depends-on): Likewise.
* modules/floor (Depends-on): Likewise.
* modules/floorf (Depends-on): Likewise.
* modules/floorl (Depends-on): Likewise.
* modules/fnmatch (Depends-on): Likewise.
* modules/fopen (Depends-on): Likewise.
* modules/fprintf-posix (Depends-on): Likewise.
* modules/frexp (Depends-on): Likewise.
* modules/frexp-nolibm (Depends-on): Likewise.
* modules/frexpl (Depends-on): Likewise.
* modules/frexpl-nolibm (Depends-on): Likewise.
* modules/fseek (Depends-on): Likewise.
* modules/fsusage (Depends-on): Likewise.
* modules/ftell (Depends-on): Likewise.
* modules/ftello (Depends-on): Likewise.
* modules/futimens (Depends-on): Likewise.
* modules/getcwd (Depends-on): Likewise.
* modules/getcwd-lgpl (Depends-on): Likewise.
* modules/getdelim (Depends-on): Likewise.
* modules/getdomainname (Depends-on): Likewise.
* modules/getgroups (Depends-on): Likewise.
* modules/gethostname (Depends-on): Likewise.
* modules/getline (Depends-on): Likewise.
* modules/getlogin_r (Depends-on): Likewise.
* modules/getopt-posix (Depends-on): Likewise.
* modules/getpeername (Depends-on): Likewise.
* modules/getsockname (Depends-on): Likewise.
* modules/getsockopt (Depends-on): Likewise.
* modules/getsubopt (Depends-on): Likewise.
* modules/getusershell (Depends-on): Likewise.
* modules/glob (Depends-on): Likewise.
* modules/grantpt (Depends-on): Likewise.
* modules/iconv_open (Depends-on): Likewise.
* modules/iconv_open-utf (Depends-on): Likewise.
* modules/inet_ntop (Depends-on): Likewise.
* modules/inet_pton (Depends-on): Likewise.
* modules/ioctl (Depends-on): Likewise.
* modules/isapipe (Depends-on): Likewise.
* modules/isfinite (Depends-on): Likewise.
* modules/isinf (Depends-on): Likewise.
* modules/lchown (Depends-on): Likewise.
* modules/ldexpl (Depends-on): Likewise.
* modules/link (Depends-on): Likewise.
* modules/linkat (Depends-on): Likewise.
* modules/listen (Depends-on): Likewise.
* modules/logl (Depends-on): Likewise.
* modules/lstat (Depends-on): Likewise.
* modules/mbrlen (Depends-on): Likewise.
* modules/mbrtowc (Depends-on): Likewise.
* modules/mbsinit (Depends-on): Likewise.
* modules/mbsnrtowcs (Depends-on): Likewise.
* modules/mbsrtowcs (Depends-on): Likewise.
* modules/mbtowc (Depends-on): Likewise.
* modules/memcmp (Depends-on): Likewise.
* modules/mkdir (Depends-on): Likewise.
* modules/mkdtemp (Depends-on): Likewise.
* modules/mkfifo (Depends-on): Likewise.
* modules/mkfifoat (Depends-on): Likewise.
* modules/mknod (Depends-on): Likewise.
* modules/mkostemp (Depends-on): Likewise.
* modules/mkostemps (Depends-on): Likewise.
* modules/mkstemp (Depends-on): Likewise.
* modules/mkstemps (Depends-on): Likewise.
* modules/mktime (Depends-on): Likewise.
* modules/nanosleep (Depends-on): Likewise.
* modules/open (Depends-on): Likewise.
* modules/openat (Depends-on): Likewise.
* modules/perror (Depends-on): Likewise.
* modules/poll (Depends-on): Likewise.
* modules/popen (Depends-on): Likewise.
* modules/posix_spawn (Depends-on): Likewise.
* modules/posix_spawn_file_actions_addclose (Depends-on): Likewise.
* modules/posix_spawn_file_actions_adddup2 (Depends-on): Likewise.
* modules/posix_spawn_file_actions_addopen (Depends-on): Likewise.
* modules/posix_spawnp (Depends-on): Likewise.
* modules/pread (Depends-on): Likewise.
* modules/printf-posix (Depends-on): Likewise.
* modules/ptsname (Depends-on): Likewise.
* modules/putenv (Depends-on): Likewise.
* modules/pwrite (Depends-on): Likewise.
* modules/readline (Depends-on): Likewise.
* modules/readlink (Depends-on): Likewise.
* modules/readlinkat (Depends-on): Likewise.
* modules/recv (Depends-on): Likewise.
* modules/recvfrom (Depends-on): Likewise.
* modules/regex (Depends-on): Likewise.
* modules/remove (Depends-on): Likewise.
* modules/rename (Depends-on): Likewise.
* modules/renameat (Depends-on): Likewise.
* modules/rmdir (Depends-on): Likewise.
* modules/round (Depends-on): Likewise.
* modules/roundf (Depends-on): Likewise.
* modules/roundl (Depends-on): Likewise.
* modules/rpmatch (Depends-on): Likewise.
* modules/select (Depends-on): Likewise.
* modules/send (Depends-on): Likewise.
* modules/sendto (Depends-on): Likewise.
* modules/setenv (Depends-on): Likewise.
* modules/setlocale (Depends-on): Likewise.
* modules/setsockopt (Depends-on): Likewise.
* modules/shutdown (Depends-on): Likewise.
* modules/sigaction (Depends-on): Likewise.
* modules/signbit (Depends-on): Likewise.
* modules/sigprocmask (Depends-on): Likewise.
* modules/sinl (Depends-on): Likewise.
* modules/sleep (Depends-on): Likewise.
* modules/snprintf (Depends-on): Likewise.
* modules/snprintf-posix (Depends-on): Likewise.
* modules/socket (Depends-on): Likewise.
* modules/sprintf-posix (Depends-on): Likewise.
* modules/sqrtl (Depends-on): Likewise.
* modules/stat (Depends-on): Likewise.
* modules/strchrnul (Depends-on): Likewise.
* modules/strdup-posix (Depends-on): Likewise.
* modules/strerror (Depends-on): Likewise.
* modules/strerror_r-posix (Depends-on): Likewise.
* modules/strndup (Depends-on): Likewise.
* modules/strnlen (Depends-on): Likewise.
* modules/strptime (Depends-on): Likewise.
* modules/strsep (Depends-on): Likewise.
* modules/strsignal (Depends-on): Likewise.
* modules/strstr-simple (Depends-on): Likewise.
* modules/strtod (Depends-on): Likewise.
* modules/strtoimax (Depends-on): Likewise.
* modules/strtok_r (Depends-on): Likewise.
* modules/strtoumax (Depends-on): Likewise.
* modules/symlink (Depends-on): Likewise.
* modules/symlinkat (Depends-on): Likewise.
* modules/tanl (Depends-on): Likewise.
* modules/tcgetsid (Depends-on): Likewise.
* modules/tmpfile (Depends-on): Likewise.
* modules/trunc (Depends-on): Likewise.
* modules/truncf (Depends-on): Likewise.
* modules/truncl (Depends-on): Likewise.
* modules/uname (Depends-on): Likewise.
* modules/unlink (Depends-on): Likewise.
* modules/unlockpt (Depends-on): Likewise.
* modules/unsetenv (Depends-on): Likewise.
* modules/usleep (Depends-on): Likewise.
* modules/utimensat (Depends-on): Likewise.
* modules/vasprintf (Depends-on): Likewise.
* modules/vdprintf (Depends-on): Likewise.
* modules/vdprintf-posix (Depends-on): Likewise.
* modules/vfprintf-posix (Depends-on): Likewise.
* modules/vprintf-posix (Depends-on): Likewise.
* modules/vsnprintf (Depends-on): Likewise.
* modules/vsnprintf-posix (Depends-on): Likewise.
* modules/vsprintf-posix (Depends-on): Likewise.
* modules/wcrtomb (Depends-on): Likewise.
* modules/wcscasecmp (Depends-on): Likewise.
* modules/wcscspn (Depends-on): Likewise.
* modules/wcsdup (Depends-on): Likewise.
* modules/wcsncasecmp (Depends-on): Likewise.
* modules/wcsnrtombs (Depends-on): Likewise.
* modules/wcspbrk (Depends-on): Likewise.
* modules/wcsrtombs (Depends-on): Likewise.
* modules/wcsspn (Depends-on): Likewise.
* modules/wcsstr (Depends-on): Likewise.
* modules/wcstok (Depends-on): Likewise.
* modules/wcswidth (Depends-on): Likewise.
* modules/wctob (Depends-on): Likewise.
* modules/wctomb (Depends-on): Likewise.
* modules/wctype (Depends-on): Likewise.
* modules/wcwidth (Depends-on): Likewise.
* modules/write (Depends-on): Likewise.

* lib/unistd.in.h: Include <sys/types.h> also for 'read'.
(read): New declaration.
* lib/read.c: New file.
* lib/stdio.in.h (_GL_ATTRIBUTE_FORMAT_SCANF,
_GL_ATTRIBUTE_FORMAT_SCANF_SYSTEM): New macros.
(fgetc, fgets, fread, fscanf, getc, getchar, gets, scanf, vfscanf,
vscanf): New declarations.
* lib/stdio-read.c: New file.
* m4/read.m4: New file.
* m4/unistd_h.m4 (gl_UNISTD_H_DEFAULTS): Initialize GNULIB_READ,
REPLACE_READ.
* m4/stdio_h.m4 (gl_STDIO_H): Set GNULIB_FGETC, GNULIB_FGETS,
GNULIB_FREAD, GNULIB_FSCANF, GNULIB_GETC, GNULIB_GETCHAR, GNULIB_GETS,
GNULIB_SCANF, GNULIB_VFSCANF, GNULIB_VSCANF. In non-blocking I/O is
desired and needs workarounds, set REPLACE_STDIO_READ_FUNCS.
(gl_STDIO_H_DEFAULTS): Initialize GNULIB_FGETC, GNULIB_FGETS,
GNULIB_FREAD, GNULIB_FSCANF, GNULIB_GETC, GNULIB_GETCHAR, GNULIB_GETS,
GNULIB_SCANF, GNULIB_VFSCANF, GNULIB_VSCANF, REPLACE_STDIO_READ_FUNCS.
* modules/read: New file.
* modules/nonblocking (Files): Add lib/stdio-read.c.
* modules/unistd (Makefile.am): Substitute GNULIB_READ, REPLACE_READ.
* modules/stdio (Makefile.am): Substitute GNULIB_FGETC, GNULIB_FGETS,
GNULIB_FREAD, GNULIB_FSCANF, GNULIB_GETC, GNULIB_GETCHAR, GNULIB_GETS,
GNULIB_SCANF, GNULIB_VFSCANF, GNULIB_VSCANF, REPLACE_STDIO_READ_FUNCS.
* modules/pread (Depends-on): Add read.
* modules/safe-read (Depends-on): Likewise.
* tests/test-stdio-c++.cc (fgetc, fgets, fread, fscanf, getc, getchar,
gets, scanf, vfscanf, vscanf): Verify signatures.
* doc/posix-functions/read.texi: Mention 'nonblocking' module and
problem with non-blocking pipes.
* doc/posix-functions/fgetc.texi: Likewise.
* doc/posix-functions/fgets.texi: Likewise.
* doc/posix-functions/fread.texi: Likewise.
* doc/posix-functions/fscanf.texi: Likewise.
* doc/posix-functions/getc.texi: Likewise.
* doc/posix-functions/getchar.texi: Likewise.
* doc/posix-functions/gets.texi: Likewise.
* doc/posix-functions/scanf.texi: Likewise.
* doc/posix-functions/vfscanf.texi: Likewise.
* doc/posix-functions/vscanf.texi: Likewise.

* modules/pread (Depends-on): Add extensions.
* modules/pwrite (Depends-on): Likewise.

Signed-off-by: Eric Blake <eblake@redhat.com>

* modules/pread (Depends-on): Depend on lseek, for portability to
e.g., mingw.  Suggested by Eric Blake.
* lib/pread.c (__libc_read): Define.  Reported by Richard W.M. Jones.

* modules/pread: New file.
* lib/pread.c (pread): New file.
* m4/pread.m4: Likewise.
* lib/unistd.in.h (pread): Define/declare.
* m4/unistd_h.m4 (gl_UNISTD_H_DEFAULTS): Define defaults.
* modules/unistd (Makefile.am): Substitute witnesses.
* doc/posix-functions/pread.texi (pread): Update.
* MODULES.html.sh: Add pread.