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/*
* inet/bindresvport.c
*/
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <unistd.h>
#define START_PORT 600
#define END_PORT (IPPORT_RESERVED - 1)
#define NUM_PORTS (END_PORT - START_PORT)
int bindresvport(int sd, struct sockaddr_in *sin)
{
struct sockaddr_in me;
static short port;
int ret = 0;
int i;
if (sin == NULL) {
sin = &me;
memset(sin, 0, sizeof(me));
sin->sin_port = AF_INET;
}
else if (sin->sin_family != AF_INET) {
errno = EPFNOSUPPORT;
ret = -1;
goto bail;
}
if (port == 0) {
port = START_PORT + (getpid() % NUM_PORTS);
}
for (i = 0; i < NUM_PORTS; i++, port++) {
sin->sin_port = htons(port);
if ((ret = bind(sd, sin, sizeof(*sin))) != -1)
break;
if (port == END_PORT)
port = START_PORT;
}
bail:
return ret;
}
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