Excerpts from Norbert Hartl's message of 2015-03-19 14:09:28 +0100:
> That's my point. Or better I like to know how the plugin can distinguish
> them. Usually there shouldn't be a difference. I know the /proc filesystem.
> It is what unix is all about. Make every information available as file. You
> say it is a virtual filesystem? Yes, but there are only virtual filesystems
> in linux. Below is always a device driver accessing disks, cdroms, etc.
> Memory or the kernel does not make a difference. They are all the same and
> they should according to unix. So I still not understand the problem.
files in /proc are not seekable.
that or something related may be the problem.
compare this strace:
/proc/uptime:
lstat64("/proc/uptime", {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
open("/proc/uptime", O_RDONLY) = 8
fstat64(8, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xfffffffff722e000
fstat64(8, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
_llseek(8, 0, [0], SEEK_SET) = 0
_llseek(8, 0, [0], SEEK_SET) = 0
_llseek(8, 0, [0], SEEK_SET) = 0
_llseek(8, 0, [0], SEEK_SET) = 0
close(8) = 0
/etc/profile:
lstat64("/etc/profile", {st_mode=S_IFREG|0644, st_size=1750, ...}) = 0
open("/etc/profile", O_RDONLY) = 8
fstat64(8, {st_mode=S_IFREG|0644, st_size=1750, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xfffffffff722e000
fstat64(8, {st_mode=S_IFREG|0644, st_size=1750, ...}) = 0
_llseek(8, 0, [0], SEEK_SET) = 0
read(8, "# /etc/profile\n\n# System wide en"..., 1750) = 1750
_llseek(8, 1750, [1750], SEEK_SET) = 0
_llseek(8, 1750, [1750], SEEK_SET) = 0
read(8, "", 4096) = 0
_llseek(8, 0, [0], SEEK_SET) = 0
close(8) = 0
/proc/uptime comes with a filesize of 0, and this, pharo tries to read 0 bytes
from it.
or rather, since there is no read() call, it concludes that there is nothing to
read.
greetings, martin.
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