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  1. #include <netdb.h>
  2.  
  3. int
  4. main(void)
  5. {
  6.     struct protoent *p;
  7.  
  8.     setprotoent(0);
  9.     p = getprotobyname("tcp");
  10.     printf("%d\n", p->p_proto);
  11.  
  12.     return 0;
  13. }
Success #stdin #stdout 0s 4536KB
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stdin 
Standard input is empty
stdout 
6
https://ideone.com/OudRVH
language:
C (gcc 8.3)
created:
5 years ago
visibility:
public

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