kc3-lang/gnulib/lib/i-ring-test.c

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• Hash : 7f01591a
  Author :
  Date : 2006-11-12T17:35:38
  

  Make fts (in FTS_CWDFD mode) more efficient by caching a few open
  file descriptors.  This also averts a failure on systems with
  native openat support when a traversed directory lacks "x" access.
  * lib/fts_.h: Include "i-ring.h"
  (struct FTS) [fts_fd_ring]: New member.
  * lib/fts.c (RESTORE_INITIAL_CWD): Also call fd_ring_clear.
  (FCHDIR): Add parentheses.
  (fd_ring_check, fd_ring_print) [!FTS_DEBUG]: Define away.
  (cwd_advance_fd): Add a 3rd parameter.  Adjust all callers.
  When descending, rather than simply closing the previous
  fts_cwd_fd value, push that file descriptor onto the ring.
  (same_fd, fd_ring_print, fd_ring_check) [FTS_DEBUG]: New functions.
  (fts_open): Initialize the new fd_ring member.
  (fts_close): Clear the ring.
  (fts_safe_changedir): When possible, use our new fd_ring to skip
  the diropen and fstat and dev/ino comparison that would normally
  accompany a virtual `chdir ("..")'.
  
  * modules/fts (Depends-on): Add i-ring.
  * modules/i-ring: New module.
  * lib/i-ring.c, lib/i-ring.h, lib/i-ring-test.c: New files.
  * m4/i-ring.m4: New file.
  

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• lib/i-ring-test.c

• #include <assert.h>
  #include "i-ring.h"
  /* Test with this:
     gcc -I. -Wall -W -O i-ring-test.c i-ring.c -L. -lcoreutils && ./a.out
  */
  
  int
  main ()
  {
    I_ring ir;
    i_ring_init (&ir, -1);
    int o = i_ring_push (&ir, 1);
    assert (o == -1);
    o = i_ring_push (&ir, 2);
    assert (o == -1);
    o = i_ring_push (&ir, 3);
    assert (o == -1);
    o = i_ring_push (&ir, 4);
    assert (o == -1);
    o = i_ring_push (&ir, 5);
    assert (o == 1);
    o = i_ring_push (&ir, 6);
    assert (o == 2);
    o = i_ring_push (&ir, 7);
    assert (o == 3);
  
    o = i_ring_pop (&ir);
    assert (o == 7);
    o = i_ring_pop (&ir);
    assert (o == 6);
    o = i_ring_pop (&ir);
    assert (o == 5);
    o = i_ring_pop (&ir);
    assert (o == 4);
    assert (i_ring_empty (&ir));
  
    o = i_ring_push (&ir, 8);
    assert (o == -1);
    o = i_ring_pop (&ir);
    assert (o == 8);
    assert (i_ring_empty (&ir));
  
    return 0;
  }
  

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