can any tell me what this code does...i am a university student and baffled about what this code does, lol

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/* make_contact.c */

#include "cnaiapi.h"

/*-----------------------------------------------------------------------
* make_contact - open a new TCP connection to the specified IP address
* (c) and port e(a).
*-----------------------------------------------------------------------
*/
connection
make_contact(computer c, appnum a)
{
struct sockaddr_in sockaddr;
int sock;

cnaiapi_init();

sock = socket(PF_INET, SOCK_STREAM, 0);
if (sock < 0)
return -1;

(void) memset(&sockaddr, 0, sizeof(struct sockaddr_in));

sockaddr.sin_family = AF_INET;
sockaddr.sin_port = htons(a);
sockaddr.sin_addr.s_addr = c;

if (connect(sock, (struct sockaddr *) &sockaddr, sizeof(struct sockaddr_in)) < 0) {
#if defined(LINUX) || defined(SOLARIS)
close(sock);
#elif defined(WINDOWS)
closesocket(sock);
#endif
return -1;
}
return sock;
}

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thanks