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c8e2bb5605
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. :^)
30 lines
673 B
C++
30 lines
673 B
C++
#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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