]>
Commit | Line | Data |
---|---|---|
049e7c97 RM |
1 | /* Test case for gethostbyname_r bug when buffer expansion required. */ |
2 | ||
3 | #include <netdb.h> | |
4 | #include <arpa/inet.h> | |
5 | #include <errno.h> | |
6 | #include <string.h> | |
7 | #include <stdio.h> | |
8 | #include <stdlib.h> | |
9a1c21c4 | 9 | #include <unistd.h> |
049e7c97 RM |
10 | |
11 | int | |
12 | main (void) | |
13 | { | |
14 | const char *host = "www.gnu.org"; | |
15 | ||
16 | /* This code approximates the example code in the library manual. */ | |
17 | ||
18 | struct hostent hostbuf, *hp; | |
19 | size_t hstbuflen; | |
20 | char *tmphstbuf; | |
21 | int res; | |
22 | int herr; | |
23 | ||
24 | hstbuflen = 16; /* Make it way small to ensure ERANGE. */ | |
25 | /* Allocate buffer, remember to free it to avoid memory leakage. */ | |
26 | tmphstbuf = malloc (hstbuflen); | |
27 | ||
28 | while ((res = gethostbyname_r (host, &hostbuf, tmphstbuf, hstbuflen, | |
29 | &hp, &herr)) == ERANGE) | |
30 | { | |
31 | /* Enlarge the buffer. */ | |
32 | hstbuflen *= 2; | |
33 | tmphstbuf = realloc (tmphstbuf, hstbuflen); | |
34 | } | |
35 | ||
36 | if (res != 0 || hp == NULL) | |
37 | { | |
38 | printf ("gethostbyname_r failed: %s (errno: %m)\n", strerror (res)); | |
9a1c21c4 UD |
39 | |
40 | if (access ("/etc/resolv.conf", R_OK)) | |
41 | { | |
42 | puts ("DNS probably not set up"); | |
43 | return 0; | |
44 | } | |
45 | ||
049e7c97 RM |
46 | return 1; |
47 | } | |
48 | ||
49 | printf ("Got: %s %s\n", hp->h_name, | |
50 | inet_ntoa (*(struct in_addr *) hp->h_addr)); | |
51 | return 0; | |
52 | } |