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Use sysconf(_SC_HOST_NAME_MAX) to determine maximum hostname length (#70)

This commit is contained in:
Aaron LI 2018-10-05 23:03:24 +08:00 committed by Cylgom
parent bd724eae93
commit e2ed1e654b
1 changed files with 16 additions and 3 deletions
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19
src/util.c
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@ -23,12 +23,24 @@ void hostname(char** out)
{ {
struct addrinfo hints; struct addrinfo hints;
struct addrinfo* info; struct addrinfo* info;
char hostname[HOST_NAME_MAX + 1]; char* hostname;
char* dot; char* dot;
int host_name_max;
int result; int result;
hostname[HOST_NAME_MAX] = '\0'; if ((host_name_max = sysconf(_SC_HOST_NAME_MAX)) == -1)
gethostname(hostname, HOST_NAME_MAX); {
perror("sysconf(_SC_HOST_NAME_MAX)");
exit(1);
}
if ((hostname = malloc(host_name_max+1)) == NULL)
{
perror("malloc");
exit(1);
}
gethostname(hostname, sizeof(hostname));
memset(&hints, 0, sizeof hints); memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC; hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM; hints.ai_socktype = SOCK_STREAM;
@ -47,6 +59,7 @@ void hostname(char** out)
hostname_backup = *out; hostname_backup = *out;
freeaddrinfo(info); freeaddrinfo(info);
free(hostname);
} }
void free_hostname() void free_hostname()