请帮看看这几行语法错在哪里。

incarnation · 发表于 2004-5-16 21:02:38

25 for ( ; ; ) {
26 buf = Malloc(len);
27 ifc.ifc_len = len;
28 ifc.ifc_buf = buf;
29 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
30 if (errno != EINVAL || lastlen != 0) {
31 perror("ioctl error");
32 exit(1);
33 }
34 } else {
35 if (ifc.ifc_len == lastlen)
36 break; /* success, len has not changed */
37 lastlen = ifc.ifc_len;
38 }
39 len += 10 * sizeof(struct ifreq); /* increment */
40 free(buf);
41 }

复制代码

# gcc -c get_ifi_info.c
get_ifi_info.c: In function `get_ifi_info':
get_ifi_info.c:29: syntax error before `struct'
get_ifi_info.c: At top level:
get_ifi_info.c:34: syntax error before `else'
#

这是使用SIOCGIFCONF 的例子
/usr/src/usr.sbin/arp/arp.c: if (ioctl(sock, SIOCGIFCONF, &ifc) < 0) {

/usr/src/usr.sbin/mrouted/mtrace.c: if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) {

:help :thank

incarnation · 发表于 2004-5-16 22:30:44

这是全部的程序

1 /* include get_ifi_info1 */
2
3 #include "unpifi_a.h"
4 #include <net/if_a_a.h>
5 #define IFNAMSIZ 16
6 #define SIOCGIFFLAGS _IOWR('i', 17 ,struct ifreq) /* get ifnet flags */
7 #define SIOCGIFCONF _IOWR('i', 36, struct ifconf) /* get ifnet list */
8
9 struct ifi_info *
10 get_ifi_info(int family, int doaliases)
11 {
12 struct ifi_info *ifi, *ifihead, **ifipnext;
13 int sockfd, len, lastlen, flags, myflags;
14 char *ptr, *buf, lastname[IFNAMSIZ], *cptr;
15 struct ifconf ifc;
16 struct ifreq *ifr, ifrcopy;
17 struct sockaddr_in *sinptr;
18
19 if((sockfd = socket(AF_INET, SOCK_DGRAM, 0))<0) {
20 perror("socket error");
21 exit(1);
22 }
23 lastlen = 0;
24 len = 100 * sizeof(struct ifreq); /* initial buffer size guess */
25 for ( ; ; ) {
26 buf = Malloc(len);
27 ifc.ifc_len = len;
28 ifc.ifc_buf = buf;
29 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
30 if (errno != EINVAL || lastlen != 0) {
31 perror("ioctl error");
32 exit(1);
33 }
34 } else {
35 if (ifc.ifc_len == lastlen)
36 break; /* success, len has not changed */
37 lastlen = ifc.ifc_len;
38 }
39 len += 10 * sizeof(struct ifreq); /* increment */
40 free(buf);
41 }
42 ifihead = NULL;
43 ifipnext = &ifihead;
44 lastname[0] = 0;
45 /* end get_ifi_info1 */
46
47 /* include get_ifi_info2 */
48 for (ptr = buf; ptr < buf + ifc.ifc_len; ) {
49 ifr = (struct ifreq *) ptr;
50
51 #ifdef HAVE_SOCKADDR_SA_LEN
52 len = max(sizeof(struct sockaddr), ifr->ifr_addr.sa_len);
53 #else
54 switch (ifr->ifr_addr.sa_family) {
55 #ifdef IPV6
56 case AF_INET6:
57 len = sizeof(struct sockaddr_in6);
58 break;
59 #endif
60 case AF_INET:
61 default:
62 len = sizeof(struct sockaddr);
63 break;
64 }
65 #endif /* HAVE_SOCKADDR_SA_LEN */
66 ptr += sizeof(ifr->ifr_name)+len; /* for next one in buffer */
67
68 if (ifr->ifr_addr.sa_family !=family)
69 continue; /* ignore if not desired address family */
70
71 myflags = 0;
72 if ( (cptr = strchr(ifr->ifr_name, ':')) != NULL)
73 *cptr = 0; /* replace colon will null */
74 if (strncmp(lastname, ifr->ifr_name, IFNAMSIZ) == 0) {
75 if (doaliases == 0)
76 continue; /* already processed this interface */
77 myflags = IFI_ALIAS;
78 }
79 memcpy(lastname, ifr->ifr_name, IFNAMSIZ);
80
81 ifrcopy = *ifr;
82 Ioctl(sockfd, SIOCGIFFLAGS, &ifrcopy);
83 flags = ifrcopy.ifr_flags;
84 if ((flags & IFF_UP) == 0)
85 continue; /* ignore if interface not up */
86
87 ifi = Calloc(1, sizeof(struct ifi_info));
88 *ifipnext = ifi; /* prev points to this new one */
89 ifipnext = &ifi->ifi_next; /* pointer to next one goes here */
90
91 ifi->ifi_flags = flags; /* IFF_xxx values */
92 ifi->ifi_myflags = myflags; /* IFI_xxx values */
93 memcpy(ifi->ifi_name, ifr->ifr_name, IFI_NAME);
94 ifi->ifi_name[IFI_NAME-1] = '\0';
95 /* end get_ifi_info2 */
96 /* include get_ifi_info3 */
97 switch (ifr->ifr_addr.sa_family) {
98 case AF_INET:
99 sinptr = (struct sockaddr_in *) &ifr->ifr_addr;
100 if (ifi->ifi_addr == NULL) {
101 ifi->ifi_addr = Calloc(1, sizeof(struct sockaddr_in));
102 memcpy(ifi->ifi_addr, sinptr, sizeof(struct sockaddr_in));
103
104 #ifdef SIOCGIFBRDADDR
105 if (flags & IFF_BROADCAST) {
106 Ioctl(sockfd, SIOCGIFBRDADDR, &ifrcopy);
107 sinptr = (struct sockaddr_in *) &ifrcopy.ifr_broadaddr;
108 ifi->ifi_brdaddr = Calloc(1, sizeof(struct sockaddr_in));
109 memcpy(ifi->ifi_brdaddr, sinptr, sizeof(struct sockaddr_in));
110 }
111 #endif
112
113 #ifdef SIOCGIFDSTADDR
114 if (flags & IFF_POINTOPOINT) {
115 Ioctl(sockfd, SIOCGIFDSTADDR, &ifrcopy);
116 sinptr = (struct sockaddr_in *) &ifrcopy.ifr_dstaddr;
117 ifi->ifi_dstaddr = Calloc(1, sizeof(struct sockaddr_in));
118 memcpy(ifi->ifi_dstaddr, sinptr, sizeof(struct sockaddr_in));
119 }
120 #endif
121 }
122 break;
123
124 default:
125 break;
126 }
127 }
128 free(buf);
129 return(ifihead); /* pointer to first structure in linked list */
130 }
131 /* end get_ifi_info3 */
132
133 /* include free_ifi_info */
134 void
135 free_ifi_info(struct ifi_info *ifihead)
136 {
137 struct ifi_info *ifi, *ifinext;
138
139 for (ifi = ifihead; ifi != NULL; ifi = ifinext) {
140 if (ifi->ifi_addr != NULL)
141 free(ifi->ifi_addr);
142 if (ifi->ifi_brdaddr != NULL)
143 free(ifi->ifi_brdaddr);
144 if (ifi->ifi_dstaddr != NULL)
145 free(ifi->ifi_dstaddr);
146 ifinext = ifi->ifi_next; /* can't fetch ifi_next after free() */
147 free(ifi); /* the ifi_info{} itself */
148 }
149 }
150 /* end free_ifi_info */
151
152 struct ifi_info *
153 Get_ifi_info(int family, int doaliases)
154 {
155 struct ifi_info *ifi;
156
157 if ( (ifi = get_ifi_info(family, doaliases)) == NULL) {
158 perror("get_ifi_info error");
159 exit(1);
160 }
161 return(ifi);
162 }

复制代码

romy · 发表于 2004-5-17 08:52:46

会不会是某个头文件没有include?
例如SIOCGIFCONF的定义在哪个h文件里

lordbyorn · 发表于 2004-5-17 23:18:58

#define SIOCGIFCONF _IOWR('i', 36, struct ifconf)
(struct ifconf) not a variable, cann't use as an argument.

trinity · 发表于 2004-5-18 10:38:18

最初由 romy 发表
会不会是某个头文件没有include?
例如SIOCGIFCONF的定义在哪个h文件里

同感，或者是某个头文件没找到。

incarnation · 发表于 2004-5-18 16:28:11

SIOCGIFCONF定义在net/if.h
上面的if_a_a.h是if.h的复制品。

home · 发表于 2004-5-22 21:47:51

SIOCGIFCONF
ioctl()没有这个参数，现在怎么实现这个功能？？

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