I need to profile the performance of an application for which I am using strace. However, I do not really know how to interpret the various system calls the strace emits. Examples of a few of them are below: I would be grateful if someone could briefly explain in plain English what these lines from (A) to (F)…
Tag: c++
pthread – How to start running a new thread without calling join?
I want to start a new thread from the main thread. I can’t use join since I don’t want to wait for the thread to exit and than resume execution. Basically what I need is something like pthread_start(…), can’t find it though. Edit: As all of the answers suggested create_thread should st…
Change process name in Linux
I’m on Linux and I am forking/execing a new process out of my C spawn application. Is it possible to also change the naming of these new child processes? I want to be able to identify the process being started in case something goes wrong and I need to kill it manually. Currently they all have the same …
Getting IP address from struct sockaddr doesn’t work for 32bit compilation
I have a small client/server app that sends/receives UDP discovery packets. When a UDP packet is received I want to display the source IP. The client/server code is based on the UDP example from Beej: https://beej.us/guide/bgnet/html/multi/clientserver.html When I compile for 64bit the IP is displayed as expe…
Linux programmatically up/down an interface kernel
What is the programmatic way of enabling or disabling an interface in kernel space? What should be done? Answer …by using IOCTL’s… … with the IFF_UP bit set or unset depending on whether you want bring the interface up or down accordingly, i.e.: Code copy-pasted from Linux networking d…
Problem in Timers and signal
I have implemented a POSIX timer using timer_create( ) API, and this will generate SIGUSR1 when the timer expires for which i have put a handler code. Now the problem is, if this program receives another SIGUSR1, then the same signal handler will be invoked and caught. Is there any way to prevent this, so tha…
C++/Assembly IDE on Linux [closed]
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. We don’t allow questions seeking recommendations for books, tools, software libraries, and more. You can edit the question so it can be answered with facts and citations. Closed 4 years ago. Improve this ques…
Maximum values for time_t (struct timespec)
I am using the struct timespec structure and here it is: Thing is, user will be entering the values for each of these individual members, and i want to put a check a max. value the user can enter. Can I take the max. value of time_t as int max value? i.e INT_MAX for tv_sec and LONG_MAX (defined in limits.h)
mmap vs sbrk, performance comparison
Which of these calls is faster on average? I’ve heard that mmap is faster for smaller allocations but I haven’t heard a comparison of either. Any information on performance for these would be nice. Answer You should tag this with a particular implementation (like linux) since the answer surely var…
How to send integer with pipe between two processes!
I am trying to send an integer with pipe in a POSIX system but write() function is working for sending string or character data. Is there any way to send integer with a pipe? Regards Answer The safe way is to use snprintf and strtol. But if you know both processes were created using the same version of compil…