On Tue, Sep 22, 2009 at 03:49:40PM +0200, Corin wrote:
> The 'read' command seems to only read the first character and not the whole
> line.
>
> Example / comparison with bash:
>
> # /bin/dash
> # read MAX </proc/sys/net/netfilter/nf_conntrack_max
> # echo $MAX
> 2
>
> # /bin/bash
> # read MAX </proc/sys/net/netfilter/nf_conntrack_max
> # echo $MAX
> 262144
Hi, this doesn't look like a bug in dash, but in the kernel's
implementation of the /proc/sys/net/ hierarchy. If you copy the file to
/tmp/, it works just fine.
cat <<EOT >t.c
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
int main(int argc, char **argv) {
char c;
int fd = open(argv[1], O_RDONLY);
if (fd == -1) return 1;
for (;;) {
int i = read(fd, &c, 1);
if (i == 0) break;
if (i == -1) return 2;
if (write(1, &c, 1) == -1) return 3;
}
write(1, "\n", 1);
return 0;
}
EOT
gcc t.c
./a.out /proc/sys/net/unix/max_dgram_qlen
cat /proc/sys/net/unix/max_dgram_qlen
cp /proc/sys/net/unix/max_dgram_qlen /tmp/
./a.out /tmp/max_dgram_qlen
Regards, Gerrit.
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