Chhanges v1 -> v2: - Moved code to qemu-config-arch.c Cc: Ronnie Sahlberg <ronniesahlb...@gmail.com> Signed-off-by: Eduardo Habkost <ehabk...@redhat.com> --- qemu-config-arch.c | 21 +++++++++++++++++++-- qemu-config.c | 16 ++++++++++++++++ qemu-config.h | 4 ++++ qemu-options.hx | 6 +++--- 4 files changed, 42 insertions(+), 5 deletions(-)
diff --git a/qemu-config-arch.c b/qemu-config-arch.c index 9180b73..ee5d515 100644 --- a/qemu-config-arch.c +++ b/qemu-config-arch.c @@ -23,6 +23,7 @@ */ #include "qemu-config-arch.h" #include "qemu-option.h" +#include "qemu-error.h" /* Not on vm_config_groups because this is not a global option setable by -set * (QEMU_OPTION_set), just settings used to parse -readconfig argument. @@ -36,21 +37,37 @@ static QemuOptsList qemu_readconfig_opts = { .name = "path", .type = QEMU_OPT_STRING, }, + { + .name = "fd", + .type = QEMU_OPT_NUMBER, + }, { /*End of list */ } }, }; + /* Read Qemu config file based on parsed QemuOpts object * * Returns 0 on success, -errno on failure. */ static int qemu_read_config_opts(QemuOpts *opts) { + int fd = -1; + uint64_t fd_arg = qemu_opt_get_number(opts, "fd", (uint64_t)-1); const char *path = qemu_opt_get(opts, "path"); - if (!path) { + + if (fd_arg != (uint64_t)-1) { + fd = fd_arg; + } + + if (path) { + return qemu_read_config_filename(path); + } else if (fd >= 0) { + return qemu_read_config_fd(fd); + } else { + error_report("no fd or path set for config file"); return -EINVAL; } - return qemu_read_config_filename(path); } /* Read config file based on option arguments on 'arg' diff --git a/qemu-config.c b/qemu-config.c index a2c8453..750626d 100644 --- a/qemu-config.c +++ b/qemu-config.c @@ -846,3 +846,19 @@ int qemu_read_config_filename(const char *filename) } return qemu_read_config_file(f, filename); } + +/* Read Qemu config file from file descriptor + * + * Returns 0 on success, -errno on failure. + */ +int qemu_read_config_fd(int fd) +{ + /* For the "<fd:%d>" pseudo-filename, used only for error messages */ + char fname[16]; + FILE *f = fdopen(fd, "r"); + if (f == NULL) { + return -errno; + } + snprintf(fname, sizeof(fname), "<fd:%d>", fd); + return qemu_read_config_file(f, fname); +} diff --git a/qemu-config.h b/qemu-config.h index c2ab4fc..28356a6 100644 --- a/qemu-config.h +++ b/qemu-config.h @@ -20,4 +20,8 @@ int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname); */ int qemu_read_config_filename(const char *filename); +/* Read config from file descriptor + */ +int qemu_read_config_fd(int fd); + #endif /* QEMU_CONFIG_H */ diff --git a/qemu-options.hx b/qemu-options.hx index 5d14f92..ae64ca8 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -2655,11 +2655,11 @@ Old param mode (ARM only). ETEXI DEF("readconfig", HAS_ARG, QEMU_OPTION_readconfig, - "-readconfig [path=]<file>\n", QEMU_ARCH_ALL) + "-readconfig [path=]<file>|fd=<fd>\n", QEMU_ARCH_ALL) STEXI -@item -readconfig [type=]@var{file} +@item -readconfig [path=]@var{file}|fd=@var{fd} @findex -readconfig -Read device configuration from @var{file}. +Read device configuration from @var{file}, or from file descriptor @var{fd}. ETEXI DEF("writeconfig", HAS_ARG, QEMU_OPTION_writeconfig, "-writeconfig <file>\n" -- 1.7.3.2