exit() and return() in a C program
Dr Gareth J. Barker
gbarker at mph.sm.ucl.ac.uk
Wed Aug 8 19:08:02 AEST 1990
Can somebody explain to me what the lint message below means?
titan% cat test.c
main()
{
}
titan% lint test.c
test.c(3): warning: main() returns random value to invocation
environment
titan%
titan% cat test1.c
void exit();
main()
{
exit(0);
}
titan% lint test1.c
test.c(6): warning: main() returns random value to invocation environment
Replacing exit by return makes lint happy.
titan% cat test2.c
main()
{
return(0);
}
titan% lint test2.c
titan%
Is lint just trying to tell me that any function, including main, must
have at least one 'normal' return? Is this a new feature in 4.1, I
don't remember seeing this before?
--
Gareth J. Barker,
Institute of Neurology, Queen Square,
London, UK.
JANET : gbarker at uk.ac.ucl.sm.mph
INTERNET : gbarker at .mph.sm.ucl.ac.uk
BITNET : gbarker%uk.ac.ucl.sm.mph at ukacrl.bitnet
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