Qualcomm Interview Question for Technical Architects


Team: Bangalore
Country: India
Interview Type: In-Person




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1
of 1 vote

sysctl is used to modify kernel parameters at runtime. The parameters are listed under /proc/sys/.
Procfs is required for sysctl support in Linux. You can use sysctl to both read and write sysctl data.
You must login as the root user to use any one of the following command.
Method # 1: Setting value via procfs
You can use standard echo command to write data to variables:
# echo "value" > /proc/sys/location/variable
Method # 2: Temporary on the command line
Use sysctl command with -w option when you want to change a sysctl setting:
sysctl -w variable=value
Method # 3: Configuration file /etc/sysctl.conf
This is recommended way. First open /etc/sysctl.conf file
# vi /etc/sysctl.conf
Now add value:
variable = value
Close and save the changes. Type the following command to load sysctl settings from the file /etc/sysctl.conf file:
# sysctl -p

- Anonymous January 08, 2013 | Flag Reply
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0
of 0 vote

Set the socket to non-blocking mode using:- fcntl(sockfd, F_SETFL, flags | O_NONBLOCK)
To unset the O_NONBLOCK flag:- fcntl(sockfd, F_SETFL, fcntl(sockfd, F_GETFL) & ~O_NONBLOCK);

- G.Simon January 08, 2013 | Flag Reply
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0
of 0 vote

Set the socket to non-blocking mode using:- fcntl(sockfd, F_SETFL, flags | O_NONBLOCK)
To unset the O_NONBLOCK flag:- fcntl(sockfd, F_SETFL, fcntl(sockfd, F_GETFL) & ~O_NONBLOCK);

- G.Simon January 08, 2013 | Flag Reply


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