APUE
2020-02-16 21:47
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Cause the not complement of the jekyll blog and not be able to the use of Markdown.
Take some of the review of today's summary of APUE ch-7.
1. exit ,_exit,_Exit
use this functions to enter the OS
OS use the exec functions to enter the c start pro, then the main function ,then the user function.
2.return 0 , exit(0)
it depends on the compile .
today using :use return 0; to replace the effect of the exit(0);but Unix grep cant find the exit call;
ON the other hand: use the exit(0) and void main(incorrect in programming design,int main() is defined in ISO C and POSIX)
3.there is other functions library in red book C.
print the page and take notes some time.
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