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Implement signal handler tail recursion
GNU Make on Windows now appears to be working reliably. This change also fixes a bug where, after fork the Windows thread handle wasn't reset and that caused undefined behavior using SetThreadContext() with our signals
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,18 @@ | ||
| #include "libc/nt/codegen.h" | ||
| .imp psapi,__imp_EnumProcessModules,EnumProcessModules | ||
|
|
||
| .text.windows | ||
| .ftrace1 | ||
| EnumProcessModules: | ||
| .ftrace2 | ||
| #ifdef __x86_64__ | ||
| push %rbp | ||
| mov %rsp,%rbp | ||
| mov __imp_EnumProcessModules(%rip),%rax | ||
| jmp __sysv2nt | ||
| #elif defined(__aarch64__) | ||
| mov x0,#0 | ||
| ret | ||
| #endif | ||
| .endfn EnumProcessModules,globl | ||
| .previous |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,18 @@ | ||
| #include "libc/nt/codegen.h" | ||
| .imp psapi,__imp_EnumProcessModulesEx,EnumProcessModulesEx | ||
|
|
||
| .text.windows | ||
| .ftrace1 | ||
| EnumProcessModulesEx: | ||
| .ftrace2 | ||
| #ifdef __x86_64__ | ||
| push %rbp | ||
| mov %rsp,%rbp | ||
| mov __imp_EnumProcessModulesEx(%rip),%rax | ||
| jmp __sysv2nt6 | ||
| #elif defined(__aarch64__) | ||
| mov x0,#0 | ||
| ret | ||
| #endif | ||
| .endfn EnumProcessModulesEx,globl | ||
| .previous |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,18 @@ | ||
| #include "libc/nt/codegen.h" | ||
| .imp psapi,__imp_EnumProcesses,EnumProcesses | ||
|
|
||
| .text.windows | ||
| .ftrace1 | ||
| EnumProcesses: | ||
| .ftrace2 | ||
| #ifdef __x86_64__ | ||
| push %rbp | ||
| mov %rsp,%rbp | ||
| mov __imp_EnumProcesses(%rip),%rax | ||
| jmp __sysv2nt | ||
| #elif defined(__aarch64__) | ||
| mov x0,#0 | ||
| ret | ||
| #endif | ||
| .endfn EnumProcesses,globl | ||
| .previous |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,18 @@ | ||
| #include "libc/nt/codegen.h" | ||
| .imp psapi,__imp_GetModuleBaseNameW,GetModuleBaseNameW | ||
|
|
||
| .text.windows | ||
| .ftrace1 | ||
| GetModuleBaseName: | ||
| .ftrace2 | ||
| #ifdef __x86_64__ | ||
| push %rbp | ||
| mov %rsp,%rbp | ||
| mov __imp_GetModuleBaseNameW(%rip),%rax | ||
| jmp __sysv2nt | ||
| #elif defined(__aarch64__) | ||
| mov x0,#0 | ||
| ret | ||
| #endif | ||
| .endfn GetModuleBaseName,globl | ||
| .previous |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,151 @@ | ||
| /*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│ | ||
| │vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│ | ||
| ╞══════════════════════════════════════════════════════════════════════════════╡ | ||
| │ Copyright 2023 Justine Alexandra Roberts Tunney │ | ||
| │ │ | ||
| │ Permission to use, copy, modify, and/or distribute this software for │ | ||
| │ any purpose with or without fee is hereby granted, provided that the │ | ||
| │ above copyright notice and this permission notice appear in all copies. │ | ||
| │ │ | ||
| │ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │ | ||
| │ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │ | ||
| │ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │ | ||
| │ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │ | ||
| │ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │ | ||
| │ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │ | ||
| │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │ | ||
| │ PERFORMANCE OF THIS SOFTWARE. │ | ||
| ╚─────────────────────────────────────────────────────────────────────────────*/ | ||
| #include "libc/atomic.h" | ||
| #include "libc/calls/calls.h" | ||
| #include "libc/calls/struct/sigaction.h" | ||
| #include "libc/calls/struct/sigset.h" | ||
| #include "libc/dce.h" | ||
| #include "libc/nt/process.h" | ||
| #include "libc/nt/thread.h" | ||
| #include "libc/runtime/clktck.h" | ||
| #include "libc/runtime/runtime.h" | ||
| #include "libc/str/str.h" | ||
| #include "libc/sysv/consts/sig.h" | ||
| #include "libc/testlib/subprocess.h" | ||
| #include "libc/testlib/testlib.h" | ||
| #include "libc/thread/posixthread.internal.h" | ||
| #include "libc/thread/thread.h" | ||
|
|
||
| // test we can: | ||
| // 1. raise the same signal inside the signal handler | ||
| // 2. that the signal will trigger immediately after handling | ||
|
|
||
| struct SharedMemory { | ||
| pthread_t target; | ||
| atomic_bool ready; | ||
| atomic_bool got_signal; | ||
| atomic_bool handler_returned; | ||
| } * shm; | ||
|
|
||
| void OnSig(int sig) { | ||
| signal(SIGUSR1, SIG_DFL); | ||
| raise(SIGUSR1); | ||
| shm->got_signal = true; | ||
| } | ||
|
|
||
| void SetUpOnce(void) { | ||
| signal(SIGUSR1, OnSig); | ||
| shm = _mapshared(sizeof(*shm)); | ||
| } | ||
|
|
||
| void TearDownOnce(void) { | ||
| munmap(shm, sizeof(*shm)); | ||
| } | ||
|
|
||
| void SetUp(void) { | ||
| bzero(shm, sizeof(*shm)); | ||
| } | ||
|
|
||
| void *Killer(void *arg) { | ||
| ASSERT_EQ(0, pthread_kill(shm->target, SIGUSR1)); | ||
| return 0; | ||
| } | ||
|
|
||
| void *Killed(void *arg) { | ||
| shm->ready = true; | ||
| while (!shm->got_signal) donothing; | ||
| shm->handler_returned = true; | ||
| return 0; | ||
| } | ||
|
|
||
| TEST(handkill, raise) { | ||
| SPAWN(fork); | ||
| raise(SIGUSR1); | ||
| shm->handler_returned = true; | ||
| TERMS(SIGUSR1); | ||
| EXPECT_TRUE(shm->got_signal); | ||
| EXPECT_FALSE(shm->handler_returned); | ||
| } | ||
|
|
||
| TEST(handkill, main2thread_async) { | ||
| SPAWN(fork); | ||
| pthread_t th; | ||
| shm->target = pthread_self(); | ||
| pthread_create(&th, 0, Killed, 0); | ||
| while (!shm->ready) donothing; | ||
| ASSERT_EQ(0, pthread_kill(th, SIGUSR1)); | ||
| ASSERT_EQ(0, pthread_join(th, 0)); | ||
| TERMS(SIGUSR1); | ||
| EXPECT_TRUE(shm->got_signal); | ||
| EXPECT_FALSE(shm->handler_returned); | ||
| } | ||
|
|
||
| TEST(handkill, thread2main_async) { | ||
| SPAWN(fork); | ||
| pthread_t th; | ||
| shm->target = pthread_self(); | ||
| pthread_create(&th, 0, Killer, 0); | ||
| while (!shm->got_signal) donothing; | ||
| shm->handler_returned = true; | ||
| pthread_join(th, 0); | ||
| TERMS(SIGUSR1); | ||
| EXPECT_TRUE(shm->got_signal); | ||
| EXPECT_FALSE(shm->handler_returned); | ||
| } | ||
|
|
||
| TEST(handkill, thread2thread_async) { | ||
| SPAWN(fork); | ||
| pthread_t th; | ||
| pthread_create(&shm->target, 0, Killed, 0); | ||
| pthread_create(&th, 0, Killer, 0); | ||
| pthread_join(shm->target, 0); | ||
| pthread_join(th, 0); | ||
| TERMS(SIGUSR1); | ||
| EXPECT_TRUE(shm->got_signal); | ||
| EXPECT_FALSE(shm->handler_returned); | ||
| } | ||
|
|
||
| TEST(handkill, process_async) { | ||
| if (IsWindows()) return; | ||
| SPAWN(fork); | ||
| shm->ready = true; | ||
| while (!shm->got_signal) donothing; | ||
| shm->handler_returned = true; | ||
| PARENT(); | ||
| while (!shm->ready) donothing; | ||
| ASSERT_SYS(0, 0, kill(child, SIGUSR1)); | ||
| WAIT(term, SIGUSR1); | ||
| EXPECT_TRUE(shm->got_signal); | ||
| EXPECT_FALSE(shm->handler_returned); | ||
| } | ||
|
|
||
| TEST(handkill, process_pause) { | ||
| if (IsWindows()) return; | ||
| SPAWN(fork); | ||
| shm->ready = true; | ||
| pause(); | ||
| shm->handler_returned = true; | ||
| PARENT(); | ||
| while (!shm->ready) donothing; | ||
| usleep(1e6 / CLK_TCK * 2); | ||
| ASSERT_SYS(0, 0, kill(child, SIGUSR1)); | ||
| WAIT(term, SIGUSR1); | ||
| EXPECT_TRUE(shm->got_signal); | ||
| EXPECT_FALSE(shm->handler_returned); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,229 @@ | ||
| /*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│ | ||
| │vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│ | ||
| ╞══════════════════════════════════════════════════════════════════════════════╡ | ||
| │ Copyright 2023 Justine Alexandra Roberts Tunney │ | ||
| │ │ | ||
| │ Permission to use, copy, modify, and/or distribute this software for │ | ||
| │ any purpose with or without fee is hereby granted, provided that the │ | ||
| │ above copyright notice and this permission notice appear in all copies. │ | ||
| │ │ | ||
| │ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │ | ||
| │ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │ | ||
| │ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │ | ||
| │ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │ | ||
| │ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │ | ||
| │ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │ | ||
| │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │ | ||
| │ PERFORMANCE OF THIS SOFTWARE. │ | ||
| ╚─────────────────────────────────────────────────────────────────────────────*/ | ||
| #include "libc/dce.h" | ||
| #include "libc/limits.h" | ||
| #include "libc/macros.internal.h" | ||
| #include "libc/mem/mem.h" | ||
| #include "libc/nt/enum/formatmessageflags.h" | ||
| #include "libc/nt/enum/lang.h" | ||
| #include "libc/nt/enum/processaccess.h" | ||
| #include "libc/nt/process.h" | ||
| #include "libc/nt/runtime.h" | ||
| #include "libc/runtime/runtime.h" | ||
| #include "libc/stdio/internal.h" | ||
| #include "libc/stdio/stdio.h" | ||
| #include "libc/str/str.h" | ||
| #include "libc/sysv/consts/sig.h" | ||
| #include "libc/x/x.h" | ||
| #include "third_party/getopt/getopt.internal.h" | ||
|
|
||
| /** | ||
| * @fileoverview Mass Process Killer for Windows. | ||
| * | ||
| * Bad things sometimes happen during development, such as fork bombs. | ||
| * Under such circumstances, the Windows operating system itself remains | ||
| * remarkably stable (much more so than Linux would in these cases) but | ||
| * the tools on Windows for managing processes do not scale gracefully; | ||
| * GUIs like the Task Manager and Process Explorer become unresponsive | ||
| * when the system has a nontrivial number of processes, leaving no way | ||
| * to kill the processes. This tool is designed to make it easy to kill | ||
| * processes, particularly in large numbers, via a simple CLI interface. | ||
| */ | ||
|
|
||
| static const char *prog; | ||
| static char16_t **filters; | ||
| static uint32_t pids[10000]; | ||
|
|
||
| static wontreturn void PrintUsage(int rc, FILE *f) { | ||
| fprintf(f, | ||
| "Usage: %s [-nshv] NAME...\n" | ||
| "\tNAME\tcase-insensitive process name substring filter\n" | ||
| "\t-n\tdry run (print matching processes but do not kill)\n" | ||
| "\t-v\tverbose mode\n" | ||
| "\t-s\tsilent mode\n" | ||
| "\t-h\tshow help\n", | ||
| prog); | ||
| exit(rc); | ||
| } | ||
|
|
||
| static wontreturn void OutOfMemory(void) { | ||
| fprintf(stderr, "%s: out of memory\n", prog); | ||
| exit(1); | ||
| } | ||
|
|
||
| static void *Calloc(size_t n, size_t z) { | ||
| void *p; | ||
| if (!(p = calloc(n, z))) OutOfMemory(); | ||
| return p; | ||
| } | ||
|
|
||
| static void ConvertStringToLowercase16(char16_t *s) { | ||
| while (*s) { | ||
| *s = towlower(*s); | ||
| ++s; | ||
| } | ||
| } | ||
|
|
||
| static bool ShouldKillProcess(char16_t *name) { | ||
| if (!*filters) { | ||
| return true; | ||
| } | ||
| for (char16_t **f = filters; *f; ++f) { | ||
| if (strstr16(name, *f)) { | ||
| return true; | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
|
|
||
| static int64_t MyOpenProcess(uint32_t pid) { | ||
| return OpenProcess( | ||
| kNtProcessTerminate | kNtProcessQueryInformation | kNtProcessVmRead, | ||
| false, pid); | ||
| } | ||
|
|
||
| static bool GetProcessName(int64_t hand, char16_t name[hasatleast PATH_MAX]) { | ||
| int64_t hMod; | ||
| uint32_t cbNeeded; | ||
| *name = 0; | ||
| if (EnumProcessModules(hand, &hMod, sizeof(hMod), &cbNeeded)) { | ||
| GetModuleBaseName(hand, hMod, name, PATH_MAX); | ||
| } | ||
| return !!name[0]; | ||
| } | ||
|
|
||
| static char16_t *DescribeError(int err) { | ||
| static char16_t msg[256]; | ||
| FormatMessage(kNtFormatMessageFromSystem | kNtFormatMessageIgnoreInserts, 0, | ||
| err, MAKELANGID(kNtLangNeutral, kNtSublangDefault), msg, | ||
| ARRAYLEN(msg), 0); | ||
| return chomp16(msg); | ||
| } | ||
|
|
||
| int main(int argc, char *argv[]) { | ||
| int i, j; | ||
|
|
||
| // get program name | ||
| prog = argv[0] ? argv[0] : "killall"; | ||
|
|
||
| // sanity check environment | ||
| if (!IsWindows()) { | ||
| fprintf(stderr, "%s: this program is intended for windows\n", prog); | ||
| exit(1); | ||
| } | ||
|
|
||
| // try to minimize terminal writes slowing us down | ||
| setvbuf(stdin, NULL, _IONBF, 0); | ||
|
|
||
| // get flags | ||
| int opt; | ||
| bool dryrun = false; | ||
| bool silent = false; | ||
| bool verbose = false; | ||
| while ((opt = getopt(argc, argv, "nhsv")) != -1) { | ||
| switch (opt) { | ||
| case 'n': | ||
| dryrun = true; | ||
| break; | ||
| case 's': | ||
| silent = true; | ||
| break; | ||
| case 'v': | ||
| verbose = true; | ||
| break; | ||
| case 'h': | ||
| PrintUsage(0, stdout); | ||
| default: | ||
| PrintUsage(1, stderr); | ||
| } | ||
| } | ||
|
|
||
| // get names of things to kill | ||
| filters = Calloc(argc, sizeof(char16_t *)); | ||
| for (j = 0, i = optind; i < argc; ++i) { | ||
| char16_t *filter; | ||
| if ((filter = utf8to16(argv[i], -1, 0)) && *filter) { | ||
| ConvertStringToLowercase16(filter); | ||
| filters[j++] = filter; | ||
| } | ||
| } | ||
| if (!j && !dryrun) { | ||
| fprintf(stderr, "%s: missing operand\n", prog); | ||
| exit(1); | ||
| } | ||
|
|
||
| // outer loop | ||
| int count = 0; | ||
| int subcount; | ||
| do { | ||
|
|
||
| // get pids of all processes on system | ||
| uint32_t n; | ||
| if (!EnumProcesses(pids, sizeof(pids), &n)) { | ||
| fprintf(stderr, "%s: EnumProcesses() failed: %s\n", prog, | ||
| DescribeError(GetLastError())); | ||
| exit(1); | ||
| } | ||
| n /= sizeof(uint32_t); | ||
|
|
||
| // kill matching processes | ||
| int64_t hProcess; | ||
| char16_t name[PATH_MAX]; | ||
| for (subcount = i = 0; i < n; i++) { | ||
| if (!pids[i]) continue; | ||
| if ((hProcess = MyOpenProcess(pids[i]))) { | ||
| if (GetProcessName(hProcess, name)) { | ||
| ConvertStringToLowercase16(name); | ||
| if (ShouldKillProcess(name)) { | ||
| if (dryrun) { | ||
| if (!silent) { | ||
| printf("%5u %hs\n", pids[i], name); | ||
| } | ||
| ++subcount; | ||
| } else if (TerminateProcess(hProcess, SIGKILL)) { | ||
| if (!silent) { | ||
| printf("%5u %hs killed\n", pids[i], name); | ||
| } | ||
| ++subcount; | ||
| } else { | ||
| printf("%5u %hs %hs\n", pids[i], name, | ||
| DescribeError(GetLastError())); | ||
| } | ||
| } | ||
| } else if (verbose) { | ||
| fprintf(stderr, "%s: GetProcessName(%u) failed: %hs\n", prog, pids[i], | ||
| DescribeError(GetLastError())); | ||
| } | ||
| CloseHandle(hProcess); | ||
| } else if (verbose) { | ||
| fprintf(stderr, "%s: OpenProcess(%u) failed: %hs\n", prog, pids[i], | ||
| DescribeError(GetLastError())); | ||
| } | ||
| } | ||
|
|
||
| // we don't stop until we've confirmed they're all gone | ||
| count += subcount; | ||
| } while (!dryrun && subcount); | ||
|
|
||
| if (!silent && !count) { | ||
| fprintf(stderr, "%s: no processes found\n", prog); | ||
| } | ||
|
|
||
| return 0; | ||
| } |