mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-06 05:10:05 +00:00
acbee5f637
(_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.
100 lines
2.0 KiB
C
100 lines
2.0 KiB
C
/* Test program for synchronization of stdio state with file after fflush. */
|
|
|
|
#include <stdio.h>
|
|
#include <error.h>
|
|
#include <errno.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 text1[] = "Line the first\n";
|
|
static char text2[] = "Line the second\n";
|
|
|
|
static void
|
|
do_prepare (void)
|
|
{
|
|
temp_fd = create_temp_file ("tst-mmap-eofsync.", &temp_file);
|
|
if (temp_fd == -1)
|
|
error (1, errno, "cannot create temporary file");
|
|
else
|
|
{
|
|
ssize_t cc = write (temp_fd, text1, sizeof text1 - 1);
|
|
if (cc != sizeof text1 - 1)
|
|
error (1, errno, "cannot write to temporary file");
|
|
}
|
|
}
|
|
|
|
static int
|
|
do_test (void)
|
|
{
|
|
FILE *f;
|
|
char buf[128];
|
|
int result = 0;
|
|
int c;
|
|
|
|
f = fopen (temp_file, "r");
|
|
if (f == NULL)
|
|
{
|
|
perror (temp_file);
|
|
return 1;
|
|
}
|
|
|
|
if (fgets (buf, sizeof buf, f) == NULL)
|
|
{
|
|
perror ("fgets");
|
|
return 1;
|
|
}
|
|
|
|
if (strcmp (buf, text1))
|
|
{
|
|
printf ("read \"%s\", expected \"%s\"\n", buf, text1);
|
|
result = 1;
|
|
}
|
|
|
|
printf ("feof = %d, ferror = %d immediately after fgets\n",
|
|
feof (f), ferror (f));
|
|
|
|
if (fflush (f) != 0)
|
|
{
|
|
printf ("fflush failed! %m\n");
|
|
result = 1;
|
|
}
|
|
|
|
c = write (temp_fd, text2, sizeof text2 - 1);
|
|
if (c == sizeof text2 - 1)
|
|
printf ("wrote more to file\n");
|
|
else
|
|
{
|
|
printf ("wrote %d != %d (%m)\n", c, sizeof text2 - 1);
|
|
result = 1;
|
|
}
|
|
|
|
if (fgets (buf, sizeof buf, f) == NULL)
|
|
{
|
|
printf ("second fgets fails: feof = %d, ferror = %d (%m)\n",
|
|
feof (f), ferror (f));
|
|
clearerr (f);
|
|
if (fgets (buf, sizeof buf, f) == NULL)
|
|
{
|
|
printf ("retry fgets fails: feof = %d, ferror = %d (%m)\n",
|
|
feof (f), ferror (f));
|
|
result = 1;
|
|
}
|
|
}
|
|
if (result == 0 && strcmp (buf, text2))
|
|
{
|
|
printf ("second time read \"%s\", expected \"%s\"\n", buf, text2);
|
|
result = 1;
|
|
}
|
|
|
|
fclose (f);
|
|
|
|
return result;
|
|
}
|