forked from I2P_Developers/i2p.i2p
f76874ac19
Please note that Xcode project embedds the packing script (meaning it runs "ant" - zip files, and moves it to bundle)
61 lines
1.5 KiB
C
61 lines
1.5 KiB
C
#pragma once
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <errno.h>
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typedef struct sockaddr *sad; /* A necesary dummy typedef */
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int port_check(int portNum)
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{
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int sock; /* Socket that will be bind */
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struct sockaddr_in sin; /* Address Structure */
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/* Create the socket */
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/* PF_INET is the option for make a TCP socket.
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You can try "man socket" for more info */
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sock = socket( PF_INET, SOCK_STREAM, 0 );
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/* The socket creation failed */
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if ( 0 > sock ) {
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perror( "socket" );
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return ( -1 );
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}
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/* Address */
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sin.sin_family = AF_INET;
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sin.sin_port = htons( portNum ); /* htons() convert the number
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to big endian */
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sin.sin_addr.s_addr = INADDR_ANY;
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/* We bind the socket to the port PORT to check if
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the port is in use */
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if ( 0 > bind( sock, (sad)&sin, sizeof( sin ) ) ) {
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/* Bind failed, now we can check if the address is
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in use */
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if ( EADDRINUSE == errno ) {
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/* We put the code necesary to manage this case */
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printf( "The TCP port %d is in use.\n", portNum );
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}
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else
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/* If the error were other than EADDRINUSE, we print it */
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perror( "bind" );
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return 1;
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}
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/* If we arrive to this point, the port weren't in use and
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we have it attached to our program. We can close
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the socket or use it */
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close( sock ); /* Close the socket */
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return 0;
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}
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