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Lunev Code that watches for a hang has to tell a hang apart from a debugger stop, because under a debugger every thread stops and whatever liveness signal the watcher samples stops changing with them. Linux reports the tracer in /proc/self/status and Windows has IsDebuggerPresent(). Answer false elsewhere, which leaves the caller behaving as it did before the check. Match the Linux field at the start of a line. The Name: line holds fifteen characters of comm, enough to spell the field name and appear ahead of the real one. Cc: Paolo Bonzini Cc: Richard Henderson Cc: Philippe Mathieu-Daudé Cc: Zhao Liu Cc: Stefan Weil Signed-off-by: Denis V. Lunev --- include/qemu/osdep.h | 9 +++++++++ util/oslib-posix.c | 22 ++++++++++++++++++++++ util/oslib-win32.c | 5 +++++ 3 files changed, 36 insertions(+) diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h index f5fd5f4c4d0..801dec40467 100644 --- a/include/qemu/osdep.h +++ b/include/qemu/osdep.h @@ -635,6 +635,15 @@ bool qemu_write_pidfile(const char *pidfile, Error **errp); int qemu_get_thread_id(void); +/** + * qemu_debugger_attached: + * + * Returns true if a debugger is currently tracing this process. Meant for + * code that would otherwise mistake a debugger stop for a hang, and false + * on hosts where this cannot be determined. + */ +bool qemu_debugger_attached(void); + /** * qemu_kill_thread: * @tid: thread id. diff --git a/util/oslib-posix.c b/util/oslib-posix.c index 3c14b726659..e3593f57eee 100644 --- a/util/oslib-posix.c +++ b/util/oslib-posix.c @@ -112,6 +112,28 @@ int qemu_get_thread_id(void) #endif } +bool qemu_debugger_attached(void) +{ +#ifdef CONFIG_LINUX + static const char key[] = "TracerPid:"; + g_autofree char *status = NULL; + const char *p = NULL; + + if (!g_file_get_contents("/proc/self/status", &status, NULL, NULL)) { + return false; + } + while ((p = strstr(p ? p : status, key))) { + if (p == status || p[-1] == '\n') { + return atoi(p + sizeof(key) - 1) > 0; + } + p += sizeof(key) - 1; + } + return false; +#else + return false; +#endif +} + int qemu_kill_thread(int tid, int sig) { #if defined(__linux__) diff --git a/util/oslib-win32.c b/util/oslib-win32.c index b3cc5725e55..4a6e66d021f 100644 --- a/util/oslib-win32.c +++ b/util/oslib-win32.c @@ -228,6 +228,11 @@ int qemu_get_thread_id(void) return GetCurrentThreadId(); } +bool qemu_debugger_attached(void) +{ + return IsDebuggerPresent(); +} + char * qemu_get_local_state_dir(void) { -- 2.53.0