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 KiB
C
100 lines
2 KiB
C
/* Test program for synchronization of stdio state with file after fflush. */
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#include <stdio.h>
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#include <error.h>
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#include <errno.h>
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static void do_prepare (void);
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#define PREPARE(argc, argv) do_prepare ()
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static int do_test (void);
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#define TEST_FUNCTION do_test ()
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#include <test-skeleton.c>
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static char *temp_file;
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static int temp_fd;
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static char text1[] = "Line the first\n";
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static char text2[] = "Line the second\n";
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static void
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do_prepare (void)
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{
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temp_fd = create_temp_file ("tst-mmap-eofsync.", &temp_file);
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if (temp_fd == -1)
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error (1, errno, "cannot create temporary file");
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else
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{
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ssize_t cc = write (temp_fd, text1, sizeof text1 - 1);
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if (cc != sizeof text1 - 1)
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error (1, errno, "cannot write to temporary file");
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}
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}
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static int
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do_test (void)
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{
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FILE *f;
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char buf[128];
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int result = 0;
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int c;
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f = fopen (temp_file, "r");
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if (f == NULL)
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{
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perror (temp_file);
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return 1;
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}
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if (fgets (buf, sizeof buf, f) == NULL)
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{
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perror ("fgets");
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return 1;
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}
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if (strcmp (buf, text1))
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{
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printf ("read \"%s\", expected \"%s\"\n", buf, text1);
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result = 1;
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}
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printf ("feof = %d, ferror = %d immediately after fgets\n",
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feof (f), ferror (f));
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if (fflush (f) != 0)
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{
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printf ("fflush failed! %m\n");
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result = 1;
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}
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c = write (temp_fd, text2, sizeof text2 - 1);
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if (c == sizeof text2 - 1)
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printf ("wrote more to file\n");
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else
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{
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printf ("wrote %d != %d (%m)\n", c, sizeof text2 - 1);
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result = 1;
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}
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if (fgets (buf, sizeof buf, f) == NULL)
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{
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printf ("second fgets fails: feof = %d, ferror = %d (%m)\n",
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feof (f), ferror (f));
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clearerr (f);
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if (fgets (buf, sizeof buf, f) == NULL)
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{
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printf ("retry fgets fails: feof = %d, ferror = %d (%m)\n",
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feof (f), ferror (f));
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result = 1;
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}
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}
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if (result == 0 && strcmp (buf, text2))
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{
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printf ("second time read \"%s\", expected \"%s\"\n", buf, text2);
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result = 1;
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}
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fclose (f);
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return result;
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}
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