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1. Jan Schaumann (jschauma@mstdn.social)'s status on Tuesday, 26-Nov-2024 15:58:47 UTC Jan Schaumann

   in reply to

   Advanced #Programming in the #UNIX Environment

   sizeof != strlen

   Now that we know how to use gdb(1), we use it to help us understand a common mistake made when programming in C: misunderstanding the unary 'sizeof' operator, which returns the _storage size of an expression or a data type_, not the length of a string or size of a dynamic buffer.

   (This ultimately lead me to write the 'sizeof' manual page now included in #FreeBSD: https://man.freebsd.org/cgi/man.cgi?query=sizeof&apropos=0&sektion=0&manpath=FreeBSD+14.1-RELEASE+and+Ports&arch=default&format=html )

   https://youtu.be/FyPqII2rewA

   #apue

   • Jan Schaumann (jschauma@mstdn.social)'s status on Tuesday, 26-Nov-2024 15:58:48 UTC Jan Schaumann

     in reply to

     Advanced #Programming in the #UNIX Environment

     Week 5, Unix Development Tools: gdb(1), part IV

     We're (finally) wrapping up this week's materials by using the debugger to examine memory locations in a running program and illustrating how pointers and arrays work in the C programming language. We also learn that a buffer overflow does not _necessarily_ lead to a segfault.

     https://youtu.be/hr-rn0yUhAw

     #apue

   • Jan Schaumann (jschauma@mstdn.social)'s status on Tuesday, 26-Nov-2024 15:58:49 UTC Jan Schaumann

     Advanced #Programming in the #UNIX Environment

     Week 5, Unix Development Tools: gdb(1), part III

     We use our newly learned debugging skills to analyze and fix yet another flawed program. In the process, we learn to debug code from multiple source files and find out how to change the value of variables while the program is running.

     https://youtu.be/hgcj7iAxhhU

     #apue