mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-12 01:08:00 +00:00
8527462b95
This change along with a patch for rsync's safe_write() function that'll that'll soon be added to superconfigure, gets rsync working. There's one remaining issue (which isn't a blocker) which is how rsync logs an error about abnormal process termination since there's currently no way for us to send non-fatal signals between processes. rsync in cosmos is restored Fixes #1240
70 lines
1.7 KiB
C
70 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 <errno.h>
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#include <stdatomic.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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#include <sys/wait.h>
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#include <unistd.h>
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int main(int argc, char *argv[]) {
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int ws, rc;
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// create shared memory for synchronization
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atomic_int *ready =
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mmap(0, 4, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);
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if ((rc = waitpid(-1, &ws, WNOHANG)) != -1)
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return 1;
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if (errno != ECHILD)
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return 2;
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// create process
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int pid = fork();
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if (pid == -1)
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return 3;
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if (!pid) {
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for (;;)
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if (*ready)
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break;
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_Exit(0);
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}
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// wait on process
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if ((rc = waitpid(pid, &ws, WNOHANG)) == -1)
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return 4;
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if (rc != 0)
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return 5;
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if (ws)
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return 6;
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// signal subprocess
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*ready = 1;
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if ((rc = waitpid(pid, &ws, 0)) == -1)
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return 7;
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if (rc != pid)
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return 8;
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if (ws)
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return 9;
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// wait again
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if ((rc = waitpid(pid, &ws, WNOHANG)) != -1)
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return 10;
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if (errno != ECHILD)
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return 11;
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}
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