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0d74673213
This change gets rsync working without any warning or errors. On Windows we now create a bunch of C:\var\sig\x\y.pid shared memory files, so sigs can be delivered between processes. WinMain() creates this file when the process starts. If the program links signaling system calls then we make a thread at startup too, which allows asynchronous delivery each quantum and cancelation points can spot these signals potentially faster on wait See #1240
67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
// Copyright 2024 Justine Alexandra Roberts Tunney
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//
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// Permission to use, copy, modify, and/or distribute this software for
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// any purpose with or without fee is hereby granted, provided that the
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// above copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
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// WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
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// AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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// DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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// PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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// TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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// PERFORMANCE OF THIS SOFTWARE.
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#include <signal.h>
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#include <stdatomic.h>
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#include <sys/mman.h>
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#include <unistd.h>
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atomic_int *got;
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void onsig(int sig) {
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*got = sig;
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}
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int main(int argc, char *argv[]) {
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// create process shared memory
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got = mmap(0, 4, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);
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if (got == MAP_FAILED)
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return 5;
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// listen for signal
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if (signal(SIGUSR1, onsig))
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return 6;
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// block signals
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sigset_t full;
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if (sigfillset(&full))
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return 7;
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if (sigprocmask(SIG_BLOCK, &full, 0))
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return 8;
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// create child process
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int pid;
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if (!(pid = fork())) {
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sigset_t empty;
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sigemptyset(&empty);
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sigsuspend(&empty);
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*got |= 128;
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_exit(0);
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}
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// send signal
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if (kill(pid, SIGUSR1))
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return 9;
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// wait for child to die
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int ws;
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if (wait(&ws) != pid)
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return 10;
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if (ws)
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return 11;
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if (*got != (128 | SIGUSR1))
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return 12;
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}
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