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tap-bsd: handle ifname on FreeBSD hosts 

Handle ifname on FreeBSD hosts; if no ifname is given, always start
the search from tap0.  (Simplified/cleaned up version of what has been
in the FreeBSD ports for a long time.)

Signed-off-by: Juergen Lock <nox@jelal.kn-bremen.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Juergen Lock 2009-11-20 23:31:55 +01:00 committed by Blue Swirl
parent 39ca4c0832
commit 2f859a3c10
1 changed files with 28 additions and 0 deletions
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28
net/tap-bsd.c
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@ -49,11 +49,39 @@ int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required
char *dev;
struct stat s;
#ifdef __FreeBSD__
/* if no ifname is given, always start the search from tap0. */
int i;
char dname[100];
for (i = 0; i < 10; i++) {
if (*ifname) {
snprintf(dname, sizeof dname, "/dev/%s", ifname);
} else {
snprintf(dname, sizeof dname, "/dev/tap%d", i);
}
TFR(fd = open(dname, O_RDWR));
if (fd >= 0) {
break;
}
else if (errno == ENXIO || errno == ENOENT) {
break;
}
if (*ifname) {
break;
}
}
if (fd < 0) {
qemu_error("warning: could not open %s (%s): no virtual network emulation\n", dname, strerror(errno));
return -1;
}
#else
TFR(fd = open("/dev/tap", O_RDWR));
if (fd < 0) {
fprintf(stderr, "warning: could not open /dev/tap: no virtual network emulation\n");
return -1;
}
#endif
fstat(fd, &s);
dev = devname(s.st_rdev, S_IFCHR);