From 65aa496d77b839f1c48745fc5545e3e6772f724c Mon Sep 17 00:00:00 2001 From: Ronnie Sahlberg Date: Thu, 26 Jan 2012 20:47:40 +1100 Subject: [PATCH] READCONFIG: make /proc/self/fd/ a magic prefix to refer to a specific filedesriptor inherited from the parent. Signed-off-by: Ronnie Sahlberg --- qemu-config.c | 16 ++++++++++++++-- qemu-options.hx | 3 ++- 2 files changed, 16 insertions(+), 3 deletions(-) diff --git a/qemu-config.c b/qemu-config.c index b030205..9e709d4 100644 --- a/qemu-config.c +++ b/qemu-config.c @@ -770,8 +770,20 @@ out: int qemu_read_config_file(const char *filename) { - FILE *f = fopen(filename, "r"); - int ret; + FILE *f; + int ret, fd; + char *ptr = NULL; + + if (strncmp(filename, "/proc/self/fd/", 14)) { + f = fopen(filename, "r"); + } else { + errno = 0; + fd = strtol(filename + 14, &ptr, 10); + if (errno != 0 || ptr == filename + 14 || *ptr != '\0') { + return -EINVAL; + } + f = fdopen(fd, "r"); + } if (f == NULL) { return -errno; diff --git a/qemu-options.hx b/qemu-options.hx index 3a07ae8..e54af58 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -2577,7 +2577,8 @@ DEF("readconfig", HAS_ARG, QEMU_OPTION_readconfig, STEXI @item -readconfig @var{file} @findex -readconfig -Read device configuration from @var{file}. +Read device configuration from @var{file}. Use '/proc/self/fd/' as filename +to read from an existing, inherited, filedesriptor. ETEXI DEF("writeconfig", HAS_ARG, QEMU_OPTION_writeconfig, "-writeconfig \n" -- 1.7.3.1