Checking if errno != EINTR: what does it mean?

Question

I\'ve found this piece of code used several times (also a similar one where it\'s used open() instead of write()).

int c = write(fd         


        

Answer 1

the answers here are really good and i want to add some internal details :

System calls that are interrupted by signals can either abort and return EINTR or automatically restart themselves if and only if SA_RESTART is specified in sigaction(2)

and the one responsible for this task is the restart_block which used to track information and arguments for restarting system calls