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tap: Convert launch_script() to Error

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Fixes inappropriate use of stderr in monitor command handler.

While there, improve the messages some.

[Fixed Error **err -> Error *err local variable that broke the build.
--Stefan]

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 1431691143-1015-10-git-send-email-armbru@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Markus Armbruster 2015-05-15 13:58:57 +02:00 committed by Stefan Hajnoczi
parent 445f116cab
commit ac4fcf5639
1 changed files with 28 additions and 12 deletions
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40
net/tap.c
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@ -59,7 +59,8 @@ typedef struct TAPState {
unsigned host_vnet_hdr_len;
} TAPState;
static int launch_script(const char *setup_script, const char *ifname, int fd);
static void launch_script(const char *setup_script, const char *ifname,
int fd, Error **errp);
static int tap_can_send(void *opaque);
static void tap_send(void *opaque);
@ -288,6 +289,7 @@ static void tap_set_offload(NetClientState *nc, int csum, int tso4,
static void tap_cleanup(NetClientState *nc)
{
TAPState *s = DO_UPCAST(TAPState, nc, nc);
Error *err = NULL;
if (s->vhost_net) {
vhost_net_cleanup(s->vhost_net);
@ -296,8 +298,12 @@ static void tap_cleanup(NetClientState *nc)
qemu_purge_queued_packets(nc);
if (s->down_script[0])
launch_script(s->down_script, s->down_script_arg, s->fd);
if (s->down_script[0]) {
launch_script(s->down_script, s->down_script_arg, s->fd, &err);
if (err) {
error_report_err(err);
}
}
tap_read_poll(s, false);
tap_write_poll(s, false);
@ -368,7 +374,8 @@ static TAPState *net_tap_fd_init(NetClientState *peer,
return s;
}
static int launch_script(const char *setup_script, const char *ifname, int fd)
static void launch_script(const char *setup_script, const char *ifname,
int fd, Error **errp)
{
int pid, status;
char *args[3];
@ -376,6 +383,11 @@ static int launch_script(const char *setup_script, const char *ifname, int fd)
/* try to launch network script */
pid = fork();
if (pid < 0) {
error_setg_errno(errp, errno, "could not launch network script %s",
setup_script);
return;
}
if (pid == 0) {
int open_max = sysconf(_SC_OPEN_MAX), i;
@ -390,17 +402,17 @@ static int launch_script(const char *setup_script, const char *ifname, int fd)
*parg = NULL;
execv(setup_script, args);
_exit(1);
} else if (pid > 0) {
} else {
while (waitpid(pid, &status, 0) != pid) {
/* loop */
}
if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
return 0;
return;
}
error_setg(errp, "network script %s failed with status %d",
setup_script, status);
}
fprintf(stderr, "%s: could not launch network script\n", setup_script);
return -1;
}
static int recv_fd(int c)
@ -571,6 +583,7 @@ static int net_tap_init(const NetdevTapOptions *tap, int *vnet_hdr,
const char *setup_script, char *ifname,
size_t ifname_sz, int mq_required)
{
Error *err = NULL;
int fd, vnet_hdr_required;
if (tap->has_vnet_hdr) {
@ -589,10 +602,13 @@ static int net_tap_init(const NetdevTapOptions *tap, int *vnet_hdr,
if (setup_script &&
setup_script[0] != '\0' &&
strcmp(setup_script, "no") != 0 &&
launch_script(setup_script, ifname, fd)) {
close(fd);
return -1;
strcmp(setup_script, "no") != 0) {
launch_script(setup_script, ifname, fd, &err);
if (err) {
error_report_err(err);
close(fd);
return -1;
}
}
return fd;