retitle 650667 kfreebsd-9: problems with reading of /proc/self/maps
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Hi,
I looked into ktrace of midori, we have problem with
reading of /proc/self/maps.
The kfreebsd-8 kernel handles it sufficiently.
It is possible to read /proc/self/maps in blocks,
It is possible to read more blocks,
given /proc/self/maps is bigger than block.
The kfreebsd-9 kernel allows only read of one block.
Iff the size of /proc/self/maps is bigger, even the first read fails.
Test code is bellow, try to play with BS.
Or even by
dd if=/proc/self/maps bs=200
dd if=/proc/self/maps bs=2000
Petr
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#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/mman.h>
#define BS 128
int main()
{
int i, fd;
int sum;
char buf[BS+1];
#if 0 // enable to enlarge /proc/self/maps
fd = open ("/etc/hosts", O_RDONLY);
for (i = 0; i < 100; i++)
{
mmap(NULL, 4096, PROT_READ, MAP_SHARED, fd, 0);
};
close (fd);
#endif
fd = open ("/proc/self/maps", O_RDONLY);
sum = 0;
while ((i = read(fd, buf, BS)) > 0)
{
sum += i;
buf[i] = 0;
printf("%s", buf);
}
printf("\n\nTotal %d bytes\n", sum);
};
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