aboutsummaryrefslogtreecommitdiff
path: root/libio/tst-mmap2-eofsync.c
diff options
context:
space:
mode:
authorRoland McGrath <roland@gnu.org>2002-08-02 01:29:37 +0000
committerRoland McGrath <roland@gnu.org>2002-08-02 01:29:37 +0000
commitacbee5f637fe1f2acda89cf2dbddf0d327005dd2 (patch)
tree1c4021979dcc5f419ad94871bdf4f2be23807dba /libio/tst-mmap2-eofsync.c
parente42637b67781ed47a1581c6062421de514560cb3 (diff)
downloadglibc-acbee5f637fe1f2acda89cf2dbddf0d327005dd2.zip
glibc-acbee5f637fe1f2acda89cf2dbddf0d327005dd2.tar.gz
glibc-acbee5f637fe1f2acda89cf2dbddf0d327005dd2.tar.bz2
* libio/fileops.c (_IO_file_sync_mmap): New function.
(_IO_file_jumps_mmap): Use it. (_IO_file_underflow_mmap): Rewritten. If after EOF or fflush, repeat the stat check and resize the mapped buffer as necessary. 2002-07-31 Roland McGrath <roland@frob.com> * libio/fileops.c (decide_maybe_mmap): New static function. Code taken from libio/iofopen.c:__fopen_maybe_mmap to try to mmap the file contents. Then switch the jump tables to the mmap tables if it worked, or the vanilla file tables if not. (_IO_file_underflow_maybe_mmap): New function. (_IO_file_seekoff_maybe_mmap): New function. (_IO_file_xsgetn_maybe_mmap): New function. (_IO_file_jumps_maybe_mmap): New variable, jump table using those. * libio/libioP.h: Declare those. * libio/wfileops.c (_IO_wfile_underflow_maybe_mmap): New function. (_IO_wfile_jumps_maybe_mmap): New variable, jump table using that. * libio/iofopen.c (__fopen_maybe_mmap): Don't try to mmap here. If the stream is read-only, set its jump tables to those new ones. * libio/iofdopen.c (_IO_new_fdopen) [_G_HAVE_MMAP]: Set the initial jump tables to the maybe_mmap ones, and don't call __fopen_maybe_mmap. We need the tables set before _IO_file_attach. * libio/tst-mmap-eofsync.c: New file. * libio/tst-mmap-fflushsync.c: New file. * libio/bug-mmap-fflush.c: New file. * libio/tst-mmap2-eofsync.c: New file. * libio/Makefile (tests): Add them. * libio/wfileops.c (_IO_wfile_underflow_mmap): Don't set EOF bit when _IO_file_underflow_mmap fails, it already set the appropriate bit.
Diffstat (limited to 'libio/tst-mmap2-eofsync.c')
-rw-r--r--libio/tst-mmap2-eofsync.c137
1 files changed, 137 insertions, 0 deletions
diff --git a/libio/tst-mmap2-eofsync.c b/libio/tst-mmap2-eofsync.c
new file mode 100644
index 0000000..4275d4a
--- /dev/null
+++ b/libio/tst-mmap2-eofsync.c
@@ -0,0 +1,137 @@
+/* Test program for synchronization of stdio state with file after EOF. */
+
+#include <stdio.h>
+#include <error.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+
+static void do_prepare (void);
+#define PREPARE(argc, argv) do_prepare ()
+static int do_test (void);
+#define TEST_FUNCTION do_test ()
+#include <test-skeleton.c>
+
+static char *temp_file;
+static int temp_fd;
+
+static char *pages;
+
+static void
+do_prepare (void)
+{
+ pages = malloc (getpagesize () * 2);
+ memset (pages, 'a', getpagesize ());
+ memset (pages + getpagesize (), 'b', getpagesize ());
+
+ temp_fd = create_temp_file ("tst-mmap2-eofsync.", &temp_file);
+ if (temp_fd == -1)
+ error (1, errno, "cannot create temporary file");
+ else
+ {
+ ssize_t cc = write (temp_fd, pages, getpagesize ());
+ if (cc != getpagesize ())
+ error (1, errno, "cannot write to temporary file");
+ }
+}
+
+static int
+do_test (void)
+{
+ const size_t pagesize = getpagesize ();
+ FILE *f;
+ char buf[pagesize];
+ int result = 0;
+ int c;
+
+ f = fopen (temp_file, "r");
+ if (f == NULL)
+ {
+ perror (temp_file);
+ return 1;
+ }
+
+ if (fread (buf, pagesize, 1, f) != 1)
+ {
+ perror ("fread");
+ return 1;
+ }
+
+ if (memcmp (buf, pages, pagesize))
+ {
+ puts ("data mismatch in page 1");
+ result = 1;
+ }
+
+ printf ("feof = %d, ferror = %d immediately after fread\n",
+ feof (f), ferror (f));
+
+ c = fgetc (f);
+ if (c == EOF)
+ printf ("fgetc -> EOF (feof = %d, ferror = %d)\n",
+ feof (f), ferror (f));
+ else
+ {
+ printf ("fgetc returned %o (feof = %d, ferror = %d)\n",
+ c, feof (f), ferror (f));
+ result = 1;
+ }
+
+ c = write (temp_fd, pages + pagesize, pagesize);
+ if (c == pagesize)
+ printf ("wrote more to file\n");
+ else
+ {
+ printf ("wrote %d != %d (%m)\n", c, pagesize);
+ result = 1;
+ }
+
+ if (fread (buf, pagesize, 1, f) != 1)
+ {
+ printf ("second fread fails: feof = %d, ferror = %d (%m)\n",
+ feof (f), ferror (f));
+ clearerr (f);
+ if (fread (buf, pagesize, 1, f) != 1)
+ {
+ printf ("retry fread fails: feof = %d, ferror = %d (%m)\n",
+ feof (f), ferror (f));
+ result = 1;
+ }
+ }
+ if (result == 0 && memcmp (buf, pages + pagesize, pagesize))
+ {
+ puts ("data mismatch in page 2");
+ result = 1;
+ }
+
+ fseek (f, pagesize - 1, SEEK_SET);
+ c = fgetc (f);
+ if (c != 'a')
+ {
+ printf ("fgetc at end of page 1 read '%c' (%m)\n", c);
+ result = 1;
+ }
+
+ if (ftruncate (temp_fd, pagesize) < 0)
+ {
+ printf ("ftruncate failed: %m\n");
+ result = 1;
+ }
+
+ fflush (f);
+
+ c = fgetc (f);
+ if (c == EOF)
+ printf ("after truncate fgetc -> EOF (feof = %d, ferror = %d)\n",
+ feof (f), ferror (f));
+ else
+ {
+ printf ("after truncate fgetc returned '%c' (feof = %d, ferror = %d)\n",
+ c, feof (f), ferror (f));
+ result = 1;
+ }
+
+ fclose (f);
+
+ return result;
+}