Standards / Extensions | C or C++ | Dependencies |
---|---|---|
XPG4.2 |
both |
#define _XOPEN_SOURCE_EXTENDED 1
#include <netdb.h>
struct protoent *getprotobyname(const char *name);
#define _OE_SOCKETS
#include <netdb.h>
struct protoent *getprotobyname(char name);
The getprotobyname() call returns a pointer to a protoent structure for the network protocol specified on the call. getprotobyname(), getprotobynumber(), and getprotoent() all use the same static area to return the protoent structure. This static area is only valid until the next one of these functions is called on the same thread.
Special behavior for C++: To use this function with C++, you must use the _XOPEN_SOURCE_EXTENDED 1 feature test macro.
If successful, getprotobyname() returns a pointer to a protoent structure. The return value points to data that is overwritten by subsequent calls returning the same data structure.
If unsuccessful, getprotobyname() returns a NULL pointer, indicating an error or End Of File (EOF).