53 lines
1.0 KiB
C
53 lines
1.0 KiB
C
/* Check that the ftruncate syscall works trivially.
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#progos: linux
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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void
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perr (const char *s)
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{
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perror (s);
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exit (1);
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}
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int
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main (void)
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{
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FILE *f;
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const char fname[] = "sk1test.dat";
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const char tsttxt1[]
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= "This is the first and only line of this file.\n";
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const char tsttxt2[] = "Now there is a second line.\n";
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char buf[sizeof (tsttxt1) + sizeof (tsttxt2) - 1] = "";
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f = fopen (fname, "w+");
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if (f == NULL
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|| fwrite (tsttxt1, 1, strlen (tsttxt1), f) != strlen (tsttxt1))
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perr ("open or fwrite");
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if (fflush (f) != 0)
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perr ("fflush");
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if (ftruncate (fileno (f), strlen(tsttxt1) - 20) != 0)
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perr ("ftruncate");
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if (fclose (f) != 0)
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perr ("fclose");
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f = fopen (fname, "r");
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if (f == NULL
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|| fread (buf, 1, sizeof (buf), f) != strlen (tsttxt1) - 20
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|| strncmp (buf, tsttxt1, strlen (tsttxt1) - 20) != 0
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|| fclose (f) != 0)
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{
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printf ("fail\n");
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exit (1);
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}
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printf ("pass\n");
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exit (0);
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}
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