The proc tag has no wiki summary.
-1
votes
0answers
33 views
create a /proc symlink
I'm trying to build a module using the method shown in this answer.
Basically I need to create a symlink I got it to build, when I try to load it using insmod I get:
-1 invalid module format
and ...
7
votes
4answers
298 views
Linking /proc/mnt to /proc/mounts
I understand that /proc filesystem reflects the output of various processes. Unfortunately, I have a propietary (romdump) binary that expects the mount table to appear as /proc/mtd, while my Android ...
1
vote
1answer
34 views
iotop but for particular disk?
Is there a tool like iotop but for monitoring IO on specific volumes? (Or perhaps I missed a way to filter iotop?) If not is there any way to get at this information via (say)/proc? (dstat etc. ...
3
votes
1answer
171 views
Arch linux : pacman does not work when chrooting
I have Ubuntu installed on my computer. I decided to install Arch linux, but I skipped the part about Grub installation as it is already installed. Seeing that Arch does not show up in Grub's menu ...
2
votes
2answers
63 views
files in /proc/$PID (e.g. ssh-agent, Chrome) are not owned by user but by root
I am just answering another question here :-) and thus had a look – wanted to have a look at /proc/$PID/fd of ssh-agent in order to find out which socket it uses. But I can't. I am quite surprised to ...
2
votes
1answer
66 views
Explain EV in /proc/bus/input/devices data
Can anybody explain to me what the EV value in /proc/bus/input/devices is?
The keyboard always has value 120013. Why?
19
votes
2answers
540 views
How frequently is the proc file system updated on Linux?
How frequently is the proc file system updated on Linux? Is it 20 milliseconds (time quantum)?
1
vote
1answer
73 views
How to clone a read-only portion of /proc file system
The problem with reading /proc file system is that it is not atomic. I tried using a library (procfs in Python) that wishes to read it, but it has glitches about 5% of the time because the process ...
5
votes
1answer
165 views
Linux /proc/sys/kernel: where are the files sysrq-sticky, sysrq-key, and sysrq-timer?
Documentation for Red Hat Enterprise Linux 3 (section 5.3.9.3) mentions these files in /proc/sys/kernel/:
sysrq
sysrq-key
sysrq-sticky
sysrq-timer
The documentation for RHEL 5 also mentions them.
...
1
vote
1answer
57 views
Do kernel counters for jiffies in state exist in Linux?
I am looking to get time/jiffie stats on the state of a daemon process. The states I'm referring to are mentioned in the Linux Kernel Proc Filesystem document. Running, Sleeping, uninterruptible ...
8
votes
2answers
244 views
A hidden process, what it is?
[root@datacenteronline ~]# ssh root@192.168.1.172
Last login: Wed Apr 17 09:55:45 2013 from 192.168.1.187
[root@localhost ~]# ls /proc/ | grep 2266
[root@localhost ~]# cd /proc/2266
[root@localhost ...
1
vote
1answer
31 views
Looking for /procfs documentation, describing values and units of measurement
Surprisingly, comprehensive documentation for /procfs is hard to find.
For my specific question, I am looking at: cat /proc/1/statm (let's use pid=1 because it seems to be always there). I just ran ...
1
vote
0answers
29 views
Viewing shared segments created by shmget
I'm trying to "visualize" shared memory between two processes. I've created a little server-client example where the client writes some data to a shared memory location and the server reads from it. ...
1
vote
0answers
36 views
Determine how much a process is using each disk?
How do I tell how much load a particular process is contributing to each of several available volumes/mounts? Seems that dstat only shows aggregate stats across all processes per disk, and iotop only ...
1
vote
2answers
61 views
Is it possible to tell df to use /proc/mounts instead of /etc/mtab?
Installing gentoo in chroot I found that commands like mount and df doesn't work: they try to read file /etc/mtab (which of course is empty).
Can I (for future use) setup or even recompile them so, ...
2
votes
0answers
51 views
/proc/net/wireless does not show values unless run as root
cat /proc/net/wireless does not show statistics for wireless devices unless it is run as root, even though the permissions on the file are 444. The same seems to apply when accessing statistics via ...
38
votes
3answers
16k views
How do I read from /proc/$pid/mem under Linux?
The Linux proc(5) man page tells me that /proc/$pid/mem “can be used to access the pages of a process's memory”. But a straightforward attempt to use it only gives me
$ cat /proc/$$/mem ...
6
votes
2answers
258 views
Why do I have four CPUs listed in /proc/cpuinfo?
When I bought my Lenovo Thinkpad 520, it had Windows installed. I promptly cleaned that out and installed Fedora 16. I recently visited the /proc/cpuinfo and, much to my surprise, discovered that it ...
2
votes
6answers
11k views
Tell fs to free space from deleted files NOW
Is there a way to tell the kernel to give back the free disk space now? Like a write to something in /proc/ ? Using Ubuntu 11.10 with ext4.
This is probably an old and very repeated theme.
After ...
1
vote
0answers
52 views
how long use of linux? [duplicate]
/proc/uptime shows how long the system has been running since the last time I turned it on. Is there a way to determine the total amount of time the system has ever been on since I first installed it? ...
1
vote
1answer
325 views
Is there a faster interface for info from /proc/net/tcp?
Given a linux TCP socket's inode (obtained via /proc/<pid>/fd), is there a faster way to look up the information that I can get from /proc/net/tcp about this socket?
I have written a ...
1
vote
1answer
101 views
vmstat on virtual machine and large values
Hi I'm using vmstat to track machine performance during some tests (jmeter).
This is virtual machine running on a big machine where lots of other virtual machines are installed (about 20 virtual ...
12
votes
2answers
264 views
When was a process started
To know when was a process started, my first guess was to check the time when /proc/<pid>/cmdline was written/modified the last time.
ps also shows a START field. I thought both of these ...
6
votes
1answer
230 views
Files bigger than max(off64_t) on Solaris, eg “/proc/../as”
How do I read or seek from a file that's bigger than the maximum off64_t? The problem arises because the address space of a process is represented in the /proc/.../as file, which is a huge sparse file ...
0
votes
0answers
96 views
Very large values for utime and stime for foo. Is foo still running?
I am running a program foo
It has been running for close to 30 days now (even more)
Until around 10 days ago (I cannot be very exact) it used 100% of one cpu on my dual core laptop (it was at the ...
2
votes
2answers
190 views
No /proc in a Busybox-based embedded Linux distribution
I am making an embedded Linux distribution and my board is a Raspberry Pi. My kernel version is 3.2.27 without initramfs and my root file system as follows:
/lib /* contains ...
2
votes
1answer
80 views
“ps” output and comments
I'm pretty sure you cant do this but maybe someone has some weird hack...
Is there a way to get comments (#blahblah) to show up in ps output?
My problem is that i have a script, lets call it ...
0
votes
1answer
109 views
About sector and blocks, and a little confusion in /proc/diskstats
I've been studying about diskstats lately, and I get that the amount of hdd read comes in sectors. But in most places I've noticed that there exists a slight misunderstanding about sectors and blocks. ...
10
votes
2answers
430 views
Contents of /proc
Is there a site someplace that lists the contents of /proc and what each entry means?
3
votes
1answer
154 views
Timestamp of socket in /proc/<pid>/fd
If I list /proc/<pid>/fd I see a number of entries for sockets. These entries have timestamps. At first I thought they were when the socket was created. But it doesn't always appear to be the ...
2
votes
1answer
206 views
System IDLE Time > System Uptime?
I was testing out the linux api while working on something but got stuck on the following output.
[Abhii@localhost net]$ cat /proc/uptime
39135.53 149657.73
As per specs the first number should be ...
1
vote
2answers
413 views
File delete versus overwrite and link at /proc/pid/fd
It is well known that UNIX systems won't actually delete a file on disk while the file is in use. So if a file is being accessed by process 1 and process 2 deletes the file using rm, process 1 ...
1
vote
2answers
348 views
How can I disable /proc pseudo-filesystem on a shared Linux environment?
Is it possible to disable the /proc pseudo-filesystem to prevent w, ps, top, etc, from showing what other users are doing? Of course, I still want "everything else" to work correctly. Is there a ...
3
votes
1answer
167 views
Plotting the sleep/wait chain of a process
I often want to know why a process in the middle of a pipeline is sleeping and not busy processing data. My current method is:
find the pid of interest
sudo strace -pt pid to get the blocking ...
3
votes
1answer
355 views
When do jiffies increment? How a process runs in a jiffy?
I know that jiffies length is selected at kernel compile time and it is defaulted to 250 (4ms). Source: man 7 time - The Software Clock, HZ, and Jiffies
I wonder what happens inside a jiffy. What are ...
2
votes
1answer
158 views
What is the connection between jiffies and IPS? How to convert jiffies to IPS?
Reading from /proc/PID/stat a lot of information can be processed. I would like to see how many percentages has been used of CPU power by this process. There are a lot of variable around here (utime, ...
2
votes
3answers
307 views
Chroot Risks w/ /dev and /proc
I am planning to set up a few chroot jails for some users to run/test Java applications (lets just assume each application is untrusted). Is there any risk involved with mounting /dev and /proc into ...
3
votes
2answers
342 views
How can I test whether a block device is read-only from /sys or /proc?
On a CentOS6 system I have /dev/block/sr0 (read only) and /dev/block/sda (read/write). How can I find out programmatically which devices are read-only? There is a ro file in there, but it's '0' for ...
7
votes
2answers
2k views
/proc/PID/fd/X link number
In Linux, in /proc/PID/fd/X, the links for file descriptors that are pipes or sockets have a number, like:
l-wx------ 1 user user 64 Mar 24 00:05 1 -> pipe:[6839]
l-wx------ 1 user user 64 Mar 24 ...
3
votes
2answers
871 views
File descriptor linked to socket or pipe in proc [duplicate]
Possible Duplicate:
/proc/PID/fd/X link number
i have a question regarding the file descriptors and their linkage in the proc file system. I've observed that if i list the file descriptors ...
0
votes
0answers
19 views
Is there a way to read memory of a process belonging to the same user? [duplicate]
Possible Duplicate:
How do I read from /proc/$pid/mem under Linux?
I'm trying to read /proc/$pid/mem file. It's another process run by the same user. File permissions seems to be ...
12
votes
4answers
2k views
Read the stack of another process?
I'm trying to read a child process's stack but with no luck.
I know it is possible using ptrace, but ptrace's interface allows you to read only one word at a time, and I'm trying to scan a larger ...
3
votes
1answer
374 views
Do I have PCLMUL instruction set support?
Here are the flags from /proc/cpuinfo:
fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc ...
13
votes
1answer
413 views
“ss” command in iproute package; why query slab table for timewait sockets?
Forgive me if this isn't the best forum for this question, but it seems more relevant to the kernel than to the programming itself.
I'm writing a script that queries the system for open ports so that ...
5
votes
2answers
201 views
Is it possible to create a directory and file inside /proc/sys?
I am running CentOS 6.2 and I need to create a subdirectory named "crypto" inside /proc/sys. Inside /proc/sys/crypto, I need to create a file named test which contains the value "1".
I have tried ...
5
votes
1answer
460 views
change environment of a running process
How might it be possible to alter some variable in the env of an already running process, for example through /proc/PID/environ? That "file" is read-only.
Need to change or unset the DISPLAY variable ...
3
votes
2answers
827 views
How is /proc/self implemented in Linux?
I was tinkering around with the /proc filesystem in Linux, and I came across /proc/self, which is a symbolic link to the process directory of the current process. I would like to know how it is ...
0
votes
1answer
317 views
Connecting various process attributes reported by top, ps, /proc/pid/statm, /proc/pid/status, /proc/pid/smaps [closed]
Here are some of the common attributes I figured out:
top(VIRT) , smem(VSS), /proc/pid/statm (1st entry in pages), /proc/pid/status (VmSize), ps(VSZ)
top(RES) , smem(RSS), /proc/pid/statm (2nd entry ...
1
vote
0answers
172 views
Process VSS and Size: entry in /proc/pid/smaps
I was wondering why the sum of all 'Size:' entries in /proc/pid/smaps does not equal the process VSS as reported by top, ps, /proc/pid/status VmSize, /proc/pid/statm 1st entry?
Any clues?
2
votes
3answers
287 views
Is there a way to identify which process turns into Zombie process
One of the ubuntu server has 82 zombie processes. All processes shows '[sh] defunct' as process command. Is there a way to find out which process is becoming a zombie process?
I tried checking the ...
