There’s limited strace output for our tiny program. That’s great when you’re using strace in anger, but it can be overwhelming at first. The first reason is that strace is verbose. We’re using our tiny program for two reasons. We could just as easily trace any of the Linux commands or any other binary executable. We’ll call strace from the command line and pass the name of our new executable to it as the process that we want to have traced. We saved this into a file called “file-io.c” and compiled it with gcc into an executable called stex, named for “ strace example.” gcc -o stex file-io.c open a file called "strace_demo.txt", or create itįileGeek = fopen("strace_demo.txt", "w") įprintf(fileGeek, "Write this to the file" ) It’s just a quick hack so that we have something to use with strace. It doesn’t do much: It opens a file and writes a line of text to it, and it doesn’t have any error checking in it. We’ll use a small program to demonstrate strace. On Manjaro, the command is: sudo pacman -Sy strace On Fedora, type this command: sudo dnf install strace On Ubuntu, use this command: sudo apt install strace If strace isn’t already installed on your computer, you can install it very easily. RELATED: Debugging with GDB: Getting Started Installing strace There’s a list of hundreds of system calls on the syscalls man page. System calls provide all sorts of low-level functionality, such as read and write actions on files, killing processes, and so on. When the traced program terminates, strace lists the system call information to the terminal window. By comparison, what strace does is capture the system call information as the program is running. It lets you step through the logic of your program and inspect memory and variable values. A debugging program lets you investigate the internal operation of a program as it runs. This isn’t the same as debugging an application with a tool like gdb.
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