Commit e47f4765 authored by Michal Privoznik's avatar Michal Privoznik Committed by Michael Roth
Browse files

util: Introduce qemu_get_host_name() 



This function offers operating system agnostic way to fetch host
name. It is implemented for both POSIX-like and Windows systems.

Signed-off-by: default avatarMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: default avatarPhilippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: default avatarDaniel P. Berrangé <berrange@redhat.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: default avatarMichael Roth <mdroth@linux.vnet.ibm.com>
parent 844bd70b

include/qemu/osdep.h

+10 −0
Original line number Diff line number Diff line
@@ -655,4 +655,14 @@ static inline void qemu_reset_optind(void) 
#endif

}



/**

 * qemu_get_host_name:

 * @errp: Error object

 *

 * Operating system agnostic way of querying host name.

 *

 * Returns allocated hostname (caller should free), NULL on failure.

 */

char *qemu_get_host_name(Error **errp);



#endif

util/oslib-posix.c

+35 −0
Original line number Diff line number Diff line
@@ -794,3 +794,38 @@ void sigaction_invoke(struct sigaction *action, 
    }

    action->sa_sigaction(info->ssi_signo, &si, NULL);

}



#ifndef HOST_NAME_MAX

# ifdef _POSIX_HOST_NAME_MAX

#  define HOST_NAME_MAX _POSIX_HOST_NAME_MAX

# else

#  define HOST_NAME_MAX 255

# endif

#endif



char *qemu_get_host_name(Error **errp)

{

    long len = -1;

    g_autofree char *hostname = NULL;



#ifdef _SC_HOST_NAME_MAX

    len = sysconf(_SC_HOST_NAME_MAX);

#endif /* _SC_HOST_NAME_MAX */



    if (len < 0) {

        len = HOST_NAME_MAX;

    }



    /* Unfortunately, gethostname() below does not guarantee a

     * NULL terminated string. Therefore, allocate one byte more

     * to be sure. */

    hostname = g_new0(char, len + 1);



    if (gethostname(hostname, len) < 0) {

        error_setg_errno(errp, errno,

                         "cannot get hostname");

        return NULL;

    }



    return g_steal_pointer(&hostname);

}

util/oslib-win32.c

+13 −0
Original line number Diff line number Diff line
@@ -808,3 +808,16 @@ bool qemu_write_pidfile(const char *filename, Error **errp) 
    }

    return true;

}



char *qemu_get_host_name(Error **errp)

{

    wchar_t tmp[MAX_COMPUTERNAME_LENGTH + 1];

    DWORD size = G_N_ELEMENTS(tmp);



    if (GetComputerNameW(tmp, &size) == 0) {

        error_setg_win32(errp, GetLastError(), "failed close handle");

        return NULL;

    }



    return g_utf16_to_utf8(tmp, size, NULL, NULL, NULL);

}