61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
#include <netdb.h>
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#include <stdio.h>
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#include <errno.h>
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#include "../src/common.h"
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/*
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int gethostent_r(
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struct hostent *ret, char *buf, size_t buflen,
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struct hostent **result, int *h_errnop);
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Glibc2 also has reentrant versions gethostent_r(), gethostbyaddr_r(),
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gethostbyname_r() and gethostbyname2_r().
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The caller supplies a hostent structure ret which will be filled in on success,
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and a temporary work buffer buf of size buflen.
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After the call, result will point to the result on success.
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In case of an error or if no entry is found result will be NULL.
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The functions return 0 on success and a nonzero error number on failure.
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In addition to the errors returned by the nonreentrant versions of these functions,
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if buf is too small, the functions will return ERANGE, and the call should be retried
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with a larger buffer.
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The global variable h_errno is not modified, but the address of a variable in which
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to store error numbers is passed in h_errnop.
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*/
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void printhostent(struct hostent *hp) {
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char ipbuf[16];
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pc_stringfromipv4(hp->h_addr_list[0], ipbuf);
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printf("alias: %p, len: %d, name: %s, addrlist: %p, addrtype: %d, ip: %s\n",
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hp->h_aliases,
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hp->h_length,
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hp->h_name,
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hp->h_addr_list,
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hp->h_addrtype,
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ipbuf
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);
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}
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int main(int argc, char** argv) {
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struct hostent he_buf;
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struct hostent *he_res;
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char h_buf[1024];
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int ch_errno;
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int ret;
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do {
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ret = gethostent_r(&he_buf, h_buf, sizeof(h_buf), &he_res, &ch_errno);
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printf("ret: %d, h_errno: %d\n", ret, ch_errno);
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if(ret != 0) {
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errno = ret;
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ret = -1;
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}
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if(ret == -1) {
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perror("gethostent_r");
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break;
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}
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if(he_res) {
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printhostent(he_res);
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}
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} while (he_res);
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return 0;
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} |