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    \$\begingroup\$ do you need to add #include <signal.h> in the code listing? \$\endgroup\$ Commented Nov 28, 2016 at 8:16
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    \$\begingroup\$ @FlorianCastellane: in C90 and lower, for any function call done without a visible declaration, the compiler implicitly declares it as int func(). i.e. a function returning int, taking unspecified parameters. In this case raise is a function returning int, taking an int argument, so this works out (even if the compiler complains). \$\endgroup\$ Commented Nov 28, 2016 at 13:26
  • \$\begingroup\$ @Hasturkun main(){main();} \$\endgroup\$ Commented Mar 9, 2020 at 1:16