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6cc68c1ccf
Found by Joe Guo during preperation for automated code coverage output. In order to allow the Makefile wrapper to work we need to rename the test directory to tests. Signed-off-by: Andrew Bartlett <abartlet@samba.org> Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
84 lines
1.8 KiB
C
84 lines
1.8 KiB
C
/* In OpenBSD, if you write to a file, another process doesn't see it
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* in its mmap. Returns with exit status 0 if that is the case, 1 if
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* it's coherent, and other if there's a problem. */
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#include <err.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#define DATA "coherent.mmap"
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int main(int argc, char *argv[])
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{
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int tochild[2], toparent[2];
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int fd;
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volatile unsigned char *map;
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unsigned char *page;
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const char *fname = argv[1];
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char c = 0;
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if (pipe(tochild) != 0 || pipe(toparent) != 0)
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err(2, "Creating pipe");
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if (!fname)
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fname = DATA;
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fd = open(fname, O_RDWR|O_CREAT|O_TRUNC, 0600);
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if (fd < 0)
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err(2, "opening %s", fname);
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unlink(fname);
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switch (fork()) {
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case -1:
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err(2, "Fork");
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case 0:
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close(tochild[1]);
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close(toparent[0]);
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/* Wait for parent to create file. */
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if (read(tochild[0], &c, 1) != 1)
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err(2, "reading from parent");
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/* Alter first byte. */
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pwrite(fd, &c, 1, 0);
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if (write(toparent[1], &c, 1) != 1)
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err(2, "writing to parent");
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exit(0);
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default:
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close(tochild[0]);
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close(toparent[1]);
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/* Create a file and mmap it. */
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page = malloc(getpagesize());
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memset(page, 0x42, getpagesize());
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if (write(fd, page, getpagesize()) != getpagesize())
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err(2, "writing first page");
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map = mmap(NULL, getpagesize(), PROT_READ|PROT_WRITE,
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MAP_SHARED, fd, 0);
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if (map == MAP_FAILED)
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err(2, "mapping file");
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if (*map != 0x42)
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errx(2, "first byte isn't 0x42!");
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/* Tell child to alter file. */
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if (write(tochild[1], &c, 1) != 1)
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err(2, "writing to child");
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if (read(toparent[0], &c, 1) != 1)
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err(2, "reading from child");
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if (*map)
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errx(0, "mmap incoherent: first byte isn't 0.");
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exit(1);
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}
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}
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