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Questions tagged [sysctl]

The sysctl is a Unix interface used to modify variables that the kernel uses to determine behavior. There are two ways to work with sysctl: by directly reading and modifying files in /proc/sys and by using the sysctl program supplied with most distributions. The regedit interface is the closest parallel for Windows.

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modify kernel parameters in linux without using sysctl

I have an embedded system. An old linux OS runs on it. When i enter "uname -r" command i get the version information as "3.3.8-3.4". I want to modify some of network kernel parameters (increase tcp receive buffer size etc.) in /proc/sys. But sysctl…
mehmet riza oz
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sysctl doesn't creates file in proc

To communicate in kernel mode and user space, I am using this C program. I am using following Makefile to create .ko file to load. bj-m := sysctl_test.o KDIR := /lib/modules/$(shell uname -r)/build PWD := $(shell pwd) default: …
Nitinkumar Ambekar
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Is it possible to set a process's command name (p_comm)?

iTerm2 on OS X sets the tab title based on the active process's command name, as given by kp.kp_proc.p_comm from the kinfo_proc structure (see…
asmeurer
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Android Edit Sysctl Settings

In my app i need to edit sysctl settings in Android. I've seen few apps that can do this, for example but i have no idea how do they do this programmatically, any ideas how to do this?
HellCat2405
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Does Apple allow the usage of sysctl.h within iOS applications?

Does Apple allow the usage of sysctl.h within iOS applications? PS: App Scanner, a third party tool that checks code for possible private-API usage seems to think it's okay. Note: There is one more question like this : How can I know if I'm using…
boopathi
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Inconsistent runtime kernel parameters in DOCKER container and on host

my host is on Ubuntu 14.04.2 LTS and I'm using the latest centos base image in order to create a DOCKER image of IBM InfoSphere BigInsights in order to push it to the Bluemix Container Cloud. I've solved nearly everything but I'm stuck with setting…
Romeo Kienzler
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Temporarily disable AES-NI hw.optional.aes setting via sysctl

For testing reasons I would like to temporarily disable the hw.optional.aes setting on my OS X MacBook (10.10). Since I couldn't change the value directly via "sysctl -w hw.optional.aes=0" I tried to create a sysctl.conf in /etc/ and wrote the line…
user1683766
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Performance Issue on Nginx Static File Serving 10Gbps Server

I'm using Nginx to Serve Static Files on Dedicated Servers. The server has no website, it is only a File Download Server. File sizes range from MB to GBs. Previously I had 8 Dedicated Servers with 500 Mbps at unmetered.com. Each of them was…
Umar Hayat
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Why is sysctl producing E_INVAL on Mac OS X?

Below is a pared-down (error/null checks omitted) snippet of C/Obj-C code that uses sysctl to get the argv of a particular process with PID 50. ... int getProcessArgs[3] = { CTL_KERN, KERN_PROCARGS, 50 }; sysctl(getProcessArgs, 3, NULL, &length,…
DNS
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Detect app (process) state is currently running on iOS using sysctl

Is it possible at runtime to detect the state of the running processes (apps) in iOS? I would like to know if the currently running apps are running in background or foreground? Is that even possible. I've been trying for a week now to find a…
James Laurenstin
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Using sysctl(3) to write safe, portable code: good idea?

When writing safe code in straight C, I'm sick and tired of coming up with arbitrary numbers to represent limitations -- specifically, the maximum amount of memory to allocate for a single line of text. I know I can always say stuff like #define…
christiank
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Handling process information from a KEXT

Inside a KEXT, I need to do some processing where I would get either a proc_t or just a pid. If I go the pid route, I would do a sysctl() of sorts. Unfortunately, I can't do either. proc_t is undefined and sysctl() isn't either. sysctlbyname() can…
E.T
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setting tcp delayed ack using sysctl programmatically

I am trying to change the delayed_ack value to 0 from 3(default) in OS X. I can change the send space programmatically, but not the delayed_ack. Thoughts ? thanks. int sendspace,retval,new_sendspace,len; len = sizeof(sendspace); new_sendspace =…
cocoacoder
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Detect other running iOS app using systcl

I use sysctl () function to get the process list, but is there a way to detect currently running app? My app is location based app and it runs in the background. I want to detect which app is running in foreground at certain time intervals. Is this…
Rukshan
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Linux and KERN_PROC

I'm attempting to get the information of another process via the sysctl interface int mib[4] = {0}; size_t len = sizeof( mib ) / sizeof( int ); struct kinfo_proc kp; mib[0] = CTL_KERN; mib[1] = KERN_PROC; mib[2] = KERN_PROC_PID; …
Ben Crowhurst
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