- 1 year ago
gdb doesn't like fprintf(stdout, ...); and shows an error
If gdb
is showing an error when encountering fprintf(stdout, ...)
statements in your code, it might be related to how gdb
handles redirection of standard output (stdout
). By default, gdb
redirects the output of the program being debugged to its own console and does not support redirection to stdout
.
To work around this issue, you can try the following approaches:
Use
gdb
'scall
command: Instead of relying onfprintf(stdout, ...)
, you can usegdb
'scall
command to execute a function call that performs the desired output. For example, you can define a simple function in your code that prints tostdout
usingprintf
, and then call that function usinggdb
. This way, the output will be displayed ingdb
's console.Redirect output to a file: Instead of printing to
stdout
directly, you can redirect the output to a file within your program. This can be done usingfreopen
or other file redirection techniques in C/C++. By redirecting the output to a file, you can examine the contents of the file using a text editor or another tool while debugging withgdb
.
Please note that these approaches might require modifying your code temporarily for debugging purposes. Once you have identified and resolved the issue, you can revert the changes and restore the original behavior of fprintf(stdout, ...)
.