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Spoof PID across execve() on Windows
It's now possible with cosmo and redbean, to deliver a signal to a child process after it has called execve(). However the executed program needs to be compiled using cosmocc. The cosmo runtime WinMain() implementation now intercepts a _COSMO_PID environment variable that's set by execve(). It ensures the child process will use the same C:\ProgramData\cosmo\sigs file, which is where kill() will place the delivered signal. We are able to do this on Windows even better than NetBSD, which has a bug with this Fixes #1334
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| Original file line number | Diff line number | Diff line change |
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| // Copyright 2024 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. | ||
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| #include <cosmo.h> | ||
| #include <signal.h> | ||
| #include <string.h> | ||
| #include <sys/wait.h> | ||
| #include <unistd.h> | ||
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| sig_atomic_t gotsig; | ||
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| void onsig(int sig) { | ||
| gotsig = sig; | ||
| } | ||
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| int main(int argc, char* argv[]) { | ||
| sigset_t ss; | ||
| sigfillset(&ss); | ||
| sigprocmask(SIG_BLOCK, &ss, 0); | ||
| if (argc >= 2 && !strcmp(argv[1], "childe")) { | ||
| signal(SIGUSR1, onsig); | ||
| sigemptyset(&ss); | ||
| sigsuspend(&ss); | ||
| if (gotsig != SIGUSR1) | ||
| return 2; | ||
| } else { | ||
| int child; | ||
| if ((child = fork()) == -1) | ||
| return 2; | ||
| if (!child) { | ||
| execlp(argv[0], argv[0], "childe", NULL); | ||
| _Exit(127); | ||
| } | ||
| if (IsNetbsd()) { | ||
| // NetBSD has a bug where pending signals don't inherit across | ||
| // execve, even though POSIX.1 literally says you must do this | ||
| sleep(1); | ||
| } | ||
| if (kill(child, SIGUSR1)) | ||
| return 3; | ||
| int ws; | ||
| if (wait(&ws) != child) | ||
| return 4; | ||
| if (ws) | ||
| return 5; | ||
| } | ||
| } |