diff options
Diffstat (limited to 'third_party/git/compat/win32/trace2_win32_process_info.c')
| -rw-r--r-- | third_party/git/compat/win32/trace2_win32_process_info.c | 191 |
1 files changed, 0 insertions, 191 deletions
diff --git a/third_party/git/compat/win32/trace2_win32_process_info.c b/third_party/git/compat/win32/trace2_win32_process_info.c deleted file mode 100644 index 8ccbd1c2c6f8..000000000000 --- a/third_party/git/compat/win32/trace2_win32_process_info.c +++ /dev/null @@ -1,191 +0,0 @@ -#include "../../cache.h" -#include "../../json-writer.h" -#include "lazyload.h" -#include <Psapi.h> -#include <tlHelp32.h> - -/* - * An arbitrarily chosen value to limit the size of the ancestor - * array built in git_processes(). - */ -#define NR_PIDS_LIMIT 10 - -/* - * Find the process data for the given PID in the given snapshot - * and update the PROCESSENTRY32 data. - */ -static int find_pid(DWORD pid, HANDLE hSnapshot, PROCESSENTRY32 *pe32) -{ - pe32->dwSize = sizeof(PROCESSENTRY32); - - if (Process32First(hSnapshot, pe32)) { - do { - if (pe32->th32ProcessID == pid) - return 1; - } while (Process32Next(hSnapshot, pe32)); - } - return 0; -} - -/* - * Accumulate JSON array of our parent processes: - * [ - * exe-name-parent, - * exe-name-grand-parent, - * ... - * ] - * - * Note: we only report the filename of the process executable; the - * only way to get its full pathname is to use OpenProcess() - * and GetModuleFileNameEx() or QueryfullProcessImageName() - * and that seems rather expensive (on top of the cost of - * getting the snapshot). - * - * Note: we compute the set of parent processes by walking the PPID - * link in each visited PROCESSENTRY32 record. This search - * stops when an ancestor process is not found in the snapshot - * (because it exited before the current or intermediate parent - * process exited). - * - * This search may compute an incorrect result if the PPID link - * refers to the PID of an exited parent and that PID has been - * recycled and given to a new unrelated process. - * - * Worse, it is possible for a child or descendant of the - * current process to be given the recycled PID and cause a - * PPID-cycle. This would cause an infinite loop building our - * parent process array. - * - * Note: for completeness, the "System Idle" process has PID=0 and - * PPID=0 and could cause another PPID-cycle. We don't expect - * Git to be a descendant of the idle process, but because of - * PID recycling, it might be possible to get a PPID link value - * of 0. This too would cause an infinite loop. - * - * Therefore, we keep an array of the visited PPIDs to guard against - * cycles. - * - * We use a fixed-size array rather than ALLOC_GROW to keep things - * simple and avoid the alloc/realloc overhead. It is OK if we - * truncate the search and return a partial answer. - */ -static void get_processes(struct json_writer *jw, HANDLE hSnapshot) -{ - PROCESSENTRY32 pe32; - DWORD pid; - DWORD pid_list[NR_PIDS_LIMIT]; - int k, nr_pids = 0; - - pid = GetCurrentProcessId(); - while (find_pid(pid, hSnapshot, &pe32)) { - /* Only report parents. Omit self from the JSON output. */ - if (nr_pids) - jw_array_string(jw, pe32.szExeFile); - - /* Check for cycle in snapshot. (Yes, it happened.) */ - for (k = 0; k < nr_pids; k++) - if (pid == pid_list[k]) { - jw_array_string(jw, "(cycle)"); - return; - } - - if (nr_pids == NR_PIDS_LIMIT) { - jw_array_string(jw, "(truncated)"); - return; - } - - pid_list[nr_pids++] = pid; - - pid = pe32.th32ParentProcessID; - } -} - -/* - * Emit JSON data for the current and parent processes. Individual - * trace2 targets can decide how to actually print it. - */ -static void get_ancestry(void) -{ - HANDLE hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0); - - if (hSnapshot != INVALID_HANDLE_VALUE) { - struct json_writer jw = JSON_WRITER_INIT; - - jw_array_begin(&jw, 0); - get_processes(&jw, hSnapshot); - jw_end(&jw); - - trace2_data_json("process", the_repository, "windows/ancestry", - &jw); - - jw_release(&jw); - CloseHandle(hSnapshot); - } -} - -/* - * Is a debugger attached to the current process? - * - * This will catch debug runs (where the debugger started the process). - * This is the normal case. Since this code is called during our startup, - * it will not report instances where a debugger is attached dynamically - * to a running git process, but that is relatively rare. - */ -static void get_is_being_debugged(void) -{ - if (IsDebuggerPresent()) - trace2_data_intmax("process", the_repository, - "windows/debugger_present", 1); -} - -/* - * Emit JSON data with the peak memory usage of the current process. - */ -static void get_peak_memory_info(void) -{ - DECLARE_PROC_ADDR(psapi.dll, BOOL, GetProcessMemoryInfo, HANDLE, - PPROCESS_MEMORY_COUNTERS, DWORD); - - if (INIT_PROC_ADDR(GetProcessMemoryInfo)) { - PROCESS_MEMORY_COUNTERS pmc; - - if (GetProcessMemoryInfo(GetCurrentProcess(), &pmc, - sizeof(pmc))) { - struct json_writer jw = JSON_WRITER_INIT; - - jw_object_begin(&jw, 0); - -#define KV(kv) #kv, (intmax_t)pmc.kv - - jw_object_intmax(&jw, KV(PageFaultCount)); - jw_object_intmax(&jw, KV(PeakWorkingSetSize)); - jw_object_intmax(&jw, KV(PeakPagefileUsage)); - - jw_end(&jw); - - trace2_data_json("process", the_repository, - "windows/memory", &jw); - jw_release(&jw); - } - } -} - -void trace2_collect_process_info(enum trace2_process_info_reason reason) -{ - if (!trace2_is_enabled()) - return; - - switch (reason) { - case TRACE2_PROCESS_INFO_STARTUP: - get_is_being_debugged(); - get_ancestry(); - return; - - case TRACE2_PROCESS_INFO_EXIT: - get_peak_memory_info(); - return; - - default: - BUG("trace2_collect_process_info: unknown reason '%d'", reason); - } -} |