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Kernel: Add a mechanism for listening for changes to an inode.
The syscall is quite simple: int watch_file(const char* path, int path_length); It returns a file descriptor referring to a "InodeWatcher" object in the kernel. It becomes readable whenever something changes about the inode. Currently this is implemented by hooking the "metadata dirty bit" in Inode which isn't perfect, but it's a start. :^)
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12 changed files with 200 additions and 3 deletions
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Userland/mon.cpp
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29
Userland/mon.cpp
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#include <AK/LogStream.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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int main(int argc, char** argv)
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{
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const char* path = argc > 1 ? argv[1] : ".";
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int watch_fd = watch_file(path, strlen(path));
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if (watch_fd < 0) {
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perror("Unable to watch");
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return 1;
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}
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for (;;) {
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char buffer[256];
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int rc = read(watch_fd, buffer, sizeof(buffer));
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if (rc < 0) {
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perror("read");
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return 1;
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}
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if (rc == 0) {
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printf("End-of-file.\n");
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return 0;
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}
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printf("Something changed about '%s'\n", path);
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}
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return 0;
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}
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