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8022fc7d51
With fortification enabled, system calls return result needs to be checked, has it gets the __wur macro enabled. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
57 lines
1.0 KiB
C
57 lines
1.0 KiB
C
/* Test for bug in fflush synchronization behavior. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <support/xstdlib.h>
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static char *fname;
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static void prepare (void);
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#define PREPARE(argc, argv) prepare ()
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#define TEST_FUNCTION do_test ()
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static int do_test (void);
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#include "../test-skeleton.c"
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static void
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prepare (void)
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{
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int fd = create_temp_file ("bug-mmap-fflush.", &fname);
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if (fd == -1)
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exit (3);
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/* We don't need the descriptor. */
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close (fd);
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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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off_t o;
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char buffer[1024];
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snprintf (buffer, sizeof (buffer), "echo 'From foo@bar.com' > %s", fname);
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xsystem (buffer);
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f = fopen (fname, "r");
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fseek (f, 0, SEEK_END);
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o = ftello (f);
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fseek (f, 0, SEEK_SET);
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fflush (f);
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snprintf (buffer, sizeof (buffer), "echo 'From bar@baz.edu' >> %s", fname);
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xsystem (buffer);
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fseek (f, o, SEEK_SET);
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if (fgets (buffer, 1024, f) == NULL)
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exit (1);
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if (strncmp (buffer, "From ", 5) != 0)
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exit (1);
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fclose (f);
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exit (0);
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}
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