trace: Specify trace file name
Allow users to specify a file for trace-outputs at configuration. Also, allow trace files to be annotated by <pid> so each qemu instance has unique traces. The trace file name can be passed as a config option: --trace-file=/path/to/file (Default: trace ) At runtime, the pid of the qemu process is appended to the filename so that mutiple qemu instances do not have overlapping logs. Eg : trace-1234 for qemu launched with pid 1234. I have yet to test this on windows. getpid() is used at many places in code(including vnc.c), so I'm hoping this would be okay too. Edited-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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@ -318,6 +318,7 @@ check_utests="no"
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user_pie="no"
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zero_malloc=""
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trace_backend="nop"
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trace_file="trace"
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# OS specific
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if check_define __linux__ ; then
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@ -522,6 +523,8 @@ for opt do
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;;
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--trace-backend=*) trace_backend="$optarg"
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;;
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--trace-file=*) trace_file="$optarg"
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;;
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--enable-gprof) gprof="yes"
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;;
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--static)
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@ -901,6 +904,8 @@ echo " --disable-docs disable documentation build"
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echo " --disable-vhost-net disable vhost-net acceleration support"
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echo " --enable-vhost-net enable vhost-net acceleration support"
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echo " --trace-backend=B Trace backend nop simple"
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echo " --trace-file=NAME Full PATH,NAME of file to store traces"
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echo " Default:trace-<pid>"
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echo ""
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echo "NOTE: The object files are built at the place where configure is launched"
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exit 1
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@ -2206,6 +2211,7 @@ echo "fdatasync $fdatasync"
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echo "uuid support $uuid"
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echo "vhost-net support $vhost_net"
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echo "Trace backend $trace_backend"
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echo "Trace output file $trace_file-<pid>"
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if test $sdl_too_old = "yes"; then
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echo "-> Your SDL version is too old - please upgrade to have SDL support"
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@ -2471,6 +2477,12 @@ echo "TRACE_BACKEND=$trace_backend" >> $config_host_mak
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if test "$trace_backend" = "simple"; then
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echo "CONFIG_SIMPLE_TRACE=y" >> $config_host_mak
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fi
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# Set the appropriate trace file.
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if test "$trace_backend" = "simple"; then
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trace_file="\"$trace_file-%u\""
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fi
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echo "CONFIG_TRACE_FILE=$trace_file" >> $config_host_mak
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echo "TOOLS=$tools" >> $config_host_mak
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echo "ROMS=$roms" >> $config_host_mak
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echo "MAKE=$make" >> $config_host_mak
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@ -54,13 +54,26 @@ static bool write_header(FILE *fp)
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return fwrite(&header, sizeof header, 1, fp) == 1;
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}
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static bool open_trace_file(void)
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{
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char *filename;
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if (asprintf(&filename, CONFIG_TRACE_FILE, getpid()) < 0) {
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return false;
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}
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trace_fp = fopen(filename, "w");
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free(filename);
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if (!trace_fp) {
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return false;
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}
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return write_header(trace_fp);
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}
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static void flush_trace_buffer(void)
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{
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if (!trace_fp) {
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trace_fp = fopen("trace.log", "w");
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if (trace_fp) {
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write_header(trace_fp);
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}
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open_trace_file();
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}
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if (trace_fp) {
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size_t unused; /* for when fwrite(3) is declared warn_unused_result */
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