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qmp: Fail gracefully if chardev is already in use

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Trying to attach a QMP monitor to a chardev that is already in use
results in a crash because monitor_init_qmp() passes &error_abort to
qemu_chr_fe_init():

$ ./x86_64-softmmu/qemu-system-x86_64 --chardev stdio,id=foo --mon foo,mode=control --mon foo,mode=control
Unexpected error in qemu_chr_fe_init() at chardev/char-fe.c:220:
qemu-system-x86_64: --mon foo,mode=control: Device 'foo' is in use
Abgebrochen (Speicherabzug geschrieben)

Fix this by allowing monitor_init_qmp() to return an error and passing
any error in qemu_chr_fe_init() to its caller instead of aborting.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20200224143008.13362-18-kwolf@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2020-02-24 15:30:05 +01:00
parent f2098725aa
commit f27a9bb3e9
5 changed files with 16 additions and 8 deletions
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2
tests/test-util-sockets.c
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@ -71,7 +71,7 @@ int monitor_get_fd(Monitor *mon, const char *fdname, Error **errp)
*/
__thread Monitor *cur_mon;
int monitor_vprintf(Monitor *mon, const char *fmt, va_list ap) { abort(); }
void monitor_init_qmp(Chardev *chr, bool pretty) {}
void monitor_init_qmp(Chardev *chr, bool pretty, Error **errp) {}
void monitor_init_hmp(Chardev *chr, bool use_readline) {}