Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
A simple question:
I need to add some logging to my program.
If two processes use “fwrite” on the same file but not the same file descriptor will the written log messages be atomic or mixed. Is there a length limit?
Is it defined ANSI-C behaviour or implementation defined?
If the later what is on MacOSX, Linux and Windows MSVC?
It can be mixed.
If you have more than one thread/process writing to the same file, you need to use locking.
An alternative is to send log messages to a dedicated service/thread. An excellent tool to adopt is syslog, which is surely installed on all unixes and can be run on Windows.