#include <stdio.h>#include <errno.h>#include <unistd.h>#include <string.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h> struct socket_testcase {	int	domain;	int	type;	int	protocol; 	/* 0    = valid file descriptor	 * -foo = error foo	 */	int	expect; 	/* If non-zero, accept EAFNOSUPPORT to handle the case	 * of the protocol not being configured into the kernel.	 */	int	nosupport_ok;}; static struct socket_testcase tests[] = {	{ AF_MAX,  0,           0,           -EAFNOSUPPORT,    0 },	{ AF_INET, SOCK_STREAM, IPPROTO_TCP, 0,                1  },	{ AF_INET, SOCK_DGRAM,  IPPROTO_TCP, -EPROTONOSUPPORT, 1  },	{ AF_INET, SOCK_DGRAM,  IPPROTO_UDP, 0,                1  },	{ AF_INET, SOCK_STREAM, IPPROTO_UDP, -EPROTONOSUPPORT, 1  },}; #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))#define ERR_STRING_SZ	64 static int run_tests(void){	char err_string1[ERR_STRING_SZ];	char err_string2[ERR_STRING_SZ];	int i, err; 	err = 0;	for (i = 0; i < ARRAY_SIZE(tests); i++) {		struct socket_testcase *s = &tests[i];		int fd; 		fd = socket(s->domain, s->type, s->protocol);		if (fd < 0) {			if (s->nosupport_ok &&			    errno == EAFNOSUPPORT)				continue; 			if (s->expect < 0 &&			    errno == -s->expect)				continue; 			strerror_r(-s->expect, err_string1, ERR_STRING_SZ);			strerror_r(errno, err_string2, ERR_STRING_SZ); 			fprintf(stderr, "socket(%d, %d, %d) expected "				"err (%s) got (%s)\n",				s->domain, s->type, s->protocol,				err_string1, err_string2); 			err = -1;			break;		} else {			close(fd); 			if (s->expect < 0) {				strerror_r(errno, err_string1, ERR_STRING_SZ); 				fprintf(stderr, "socket(%d, %d, %d) expected "					"success got err (%s)\n",					s->domain, s->type, s->protocol,					err_string1); 				err = -1;				break;			}		}	} 	return err;} int main(void){	int err = run_tests(); 	return err;}