diff options
| author | Lin Ma <lma@suse.com> | 2016-08-17 01:13:52 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-09-13 19:08:47 +0200 |
| commit | 517b3d40166f18e321e964e5fe0d6260e92b2121 (patch) | |
| tree | 86323e58ac4ebb22937efd15eb5cb6dee74a19d0 | |
| parent | 173134467a585c66c43467c71b834cd0b488cf46 (diff) | |
chardev: Add 'help' option to print all available chardev backend types
Signed-off-by: Lin Ma <lma@suse.com>
Message-Id: <20160816171352.17021-1-lma@suse.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | qemu-char.c | 21 | ||||
| -rw-r--r-- | qemu-options.hx | 3 |
2 files changed, 19 insertions, 5 deletions
diff --git a/qemu-char.c b/qemu-char.c index 5f82ebb774..cf6a27a1bc 100644 --- a/qemu-char.c +++ b/qemu-char.c @@ -39,6 +39,7 @@ #include "io/channel-file.h" #include "io/channel-tls.h" #include "sysemu/replay.h" +#include "qemu/help_option.h" #include <zlib.h> @@ -3879,16 +3880,26 @@ CharDriverState *qemu_chr_new_from_opts(QemuOpts *opts, const char *id = qemu_opts_id(opts); char *bid = NULL; - if (id == NULL) { - error_setg(errp, "chardev: no id specified"); - goto err; - } - if (qemu_opt_get(opts, "backend") == NULL) { error_setg(errp, "chardev: \"%s\" missing backend", qemu_opts_id(opts)); goto err; } + + if (is_help_option(qemu_opt_get(opts, "backend"))) { + fprintf(stderr, "Available chardev backend types:\n"); + for (i = backends; i; i = i->next) { + cd = i->data; + fprintf(stderr, "%s\n", cd->name); + } + exit(!is_help_option(qemu_opt_get(opts, "backend"))); + } + + if (id == NULL) { + error_setg(errp, "chardev: no id specified"); + goto err; + } + for (i = backends; i; i = i->next) { cd = i->data; diff --git a/qemu-options.hx b/qemu-options.hx index 52096268b7..4927939d5d 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -2152,6 +2152,7 @@ The general form of a character device option is: ETEXI DEF("chardev", HAS_ARG, QEMU_OPTION_chardev, + "-chardev help\n" "-chardev null,id=id[,mux=on|off][,logfile=PATH][,logappend=on|off]\n" "-chardev socket,id=id[,host=host],port=port[,to=to][,ipv4][,ipv6][,nodelay][,reconnect=seconds]\n" " [,server][,nowait][,telnet][,reconnect=seconds][,mux=on|off]\n" @@ -2217,6 +2218,8 @@ Backend is one of: @option{spiceport}. The specific backend will determine the applicable options. +Use "-chardev help" to print all available chardev backend types. + All devices must have an id, which can be any string up to 127 characters long. It is used to uniquely identify this device in other command line directives. |