diff options
Diffstat (limited to 'compat')
| -rw-r--r-- | compat/access.c | 31 | ||||
| -rw-r--r-- | compat/bswap.h | 5 | ||||
| -rw-r--r-- | compat/fileno.c | 2 | ||||
| -rw-r--r-- | compat/mingw.c | 13 | ||||
| -rw-r--r-- | compat/mingw.h | 3 | ||||
| -rw-r--r-- | compat/win32/trace2_win32_process_info.c | 191 |
6 files changed, 241 insertions, 4 deletions
diff --git a/compat/access.c b/compat/access.c new file mode 100644 index 0000000000..19fda3e877 --- /dev/null +++ b/compat/access.c @@ -0,0 +1,31 @@ +#define COMPAT_CODE_ACCESS +#include "../git-compat-util.h" + +/* Do the same thing access(2) does, but use the effective uid, + * and don't make the mistake of telling root that any file is + * executable. This version uses stat(2). + */ +int git_access(const char *path, int mode) +{ + struct stat st; + + /* do not interfere a normal user */ + if (geteuid()) + return access(path, mode); + + if (stat(path, &st) < 0) + return -1; + + /* Root can read or write any file. */ + if (!(mode & X_OK)) + return 0; + + /* Root can execute any file that has any one of the execute + * bits set. + */ + if (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) + return 0; + + errno = EACCES; + return -1; +} diff --git a/compat/bswap.h b/compat/bswap.h index 5078ce5ecc..e4e25735ce 100644 --- a/compat/bswap.h +++ b/compat/bswap.h @@ -1,3 +1,6 @@ +#ifndef COMPAT_BSWAP_H +#define COMPAT_BSWAP_H + /* * Let's make sure we always have a sane definition for ntohl()/htonl(). * Some libraries define those as a function call, just to perform byte @@ -210,3 +213,5 @@ static inline void put_be64(void *ptr, uint64_t value) } #endif + +#endif /* COMPAT_BSWAP_H */ diff --git a/compat/fileno.c b/compat/fileno.c index 7b105f4cd7..8e80ef335d 100644 --- a/compat/fileno.c +++ b/compat/fileno.c @@ -1,4 +1,4 @@ -#define COMPAT_CODE +#define COMPAT_CODE_FILENO #include "../git-compat-util.h" int git_fileno(FILE *stream) diff --git a/compat/mingw.c b/compat/mingw.c index 8141f77189..a2f74aca6a 100644 --- a/compat/mingw.c +++ b/compat/mingw.c @@ -1551,19 +1551,23 @@ static int try_shell_exec(const char *cmd, char *const *argv) return 0; prog = path_lookup(interpr, 1); if (prog) { + int exec_id; int argc = 0; const char **argv2; while (argv[argc]) argc++; ALLOC_ARRAY(argv2, argc + 1); argv2[0] = (char *)cmd; /* full path to the script file */ memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc); + exec_id = trace2_exec(prog, argv2); pid = mingw_spawnv(prog, argv2, 1); if (pid >= 0) { int status; if (waitpid(pid, &status, 0) < 0) status = 255; + trace2_exec_result(exec_id, status); exit(status); } + trace2_exec_result(exec_id, -1); pid = 1; /* indicate that we tried but failed */ free(prog); free(argv2); @@ -1576,12 +1580,17 @@ int mingw_execv(const char *cmd, char *const *argv) /* check if git_command is a shell script */ if (!try_shell_exec(cmd, argv)) { int pid, status; + int exec_id; + exec_id = trace2_exec(cmd, (const char **)argv); pid = mingw_spawnv(cmd, (const char **)argv, 0); - if (pid < 0) + if (pid < 0) { + trace2_exec_result(exec_id, -1); return -1; + } if (waitpid(pid, &status, 0) < 0) status = 255; + trace2_exec_result(exec_id, status); exit(status); } return -1; @@ -2560,6 +2569,8 @@ void mingw_startup(void) wchar_t **wenv, **wargv; _startupinfo si; + trace2_initialize_clock(); + maybe_redirect_std_handles(); /* get wide char arguments and environment */ diff --git a/compat/mingw.h b/compat/mingw.h index 30d9fb3e36..4d73f8aa9d 100644 --- a/compat/mingw.h +++ b/compat/mingw.h @@ -147,8 +147,7 @@ static inline int fcntl(int fd, int cmd, ...) errno = EINVAL; return -1; } -/* bash cannot reliably detect negative return codes as failure */ -#define exit(code) exit((code) & 0xff) + #define sigemptyset(x) (void)0 static inline int sigaddset(sigset_t *set, int signum) { return 0; } diff --git a/compat/win32/trace2_win32_process_info.c b/compat/win32/trace2_win32_process_info.c new file mode 100644 index 0000000000..8ccbd1c2c6 --- /dev/null +++ b/compat/win32/trace2_win32_process_info.c @@ -0,0 +1,191 @@ +#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); + } +} |