New module 'write'.

[pspp] / ChangeLog

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+2008-09-26  Jim Meyering  <meyering@redhat.com>
+
+       fts: tweak inode comparison function
+       * lib/fts.c (fts_compare_ino): Sort on increasing, not decreasing
+       inode numbers, as documented.
+
+       fts: sort dirent entries on inode number before traversing
+       This avoids a quadratic, seek-related performance penalty when
+       operating on a directory containing many entries (measurable at 10k;
+       3.5 hours at 2 million entries with a cold cache) on certain types
+       of file systems, including ext3 and ext4, but not tmpfs.
+       * lib/fts.c (DT_MUST_BE, NOT_AN_INODE_NUMBER, D_INO): Define.
+       (FTS_INODE_SORT_DIR_ENTRIES_THRESHOLD): Define if not defined.
+       (S_MAGIC_TMPFS, S_MAGIC_NFS): Define.
+       (fs_handles_readdir_ordered_dirents_efficiently): New function.
+       (dirent_inode_sort_may_be_useful, fts_compare_ino): Likewise.
+       (fts_build): Set the stat.st_ino member from D_INO.
+       If it is likely to be useful, sort dirent entries on inode number.
+
+       * m4/fts.m4 (gl_FUNC_FTS_CORE): Check for fstatfs, sys/vfs.h,
+       and the struct statfs.f_type member.
+       * modules/fts (Depends-on): Add d-ino.
+
+2008-09-26  Bruno Haible  <bruno@clisp.org>
+
+       * modules/write: New file.
+       * lib/unistd.in.h: Include <sys/types.h>.
+       (write): New declaration.
+       * lib/write.c: New file.
+       * m4/write.m4: New file.
+       * m4/unistd_h.m4 (gl_UNISTD_H_DEFAULTS): Initialize
+       GNULIB_UNISTD_H_SIGPIPE, GNULIB_WRITE, REPLACE_WRITE.
+       * modules/unistd (Makefile.am): Substitute GNULIB_UNISTD_H_SIGPIPE,
+       GNULIB_WRITE, REPLACE_WRITE.
+       * doc/posix-functions/write.texi: Mention the write, sigpipe modules
+       and the SIGPIPE issue.
+
+       * lib/signal.in.h (SIGPIPE): Define to a replacement value.
+       (raise): New declaration.
+       * lib/sigprocmask.c (SIGPIPE_handler): New variable.
+       (ext_signal): New function.
+       (rpl_raise): New function.
+       * m4/signal_h.m4 (gl_SIGNAL_H_DEFAULTS): Initialize
+       GNULIB_SIGNAL_H_SIGPIPE.
+       * modules/signal (Makefile.am): Substitute GNULIB_SIGNAL_H_SIGPIPE.
+       * doc/posix-headers/signal.texi: Mention the SIGPIPE issue.
+
+       * modules/sigpipe: New file.
+       * m4/sigpipe.m4: New file.
+
 2008-09-25  Derek Price  <derek@ximbiot.com>
             Bruno Haible  <bruno@clisp.org>