Created
December 8, 2021 10:41
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NetBSDのfilemon機能を使用してファイルの変更イベントを監視するサンプルプログラムです。
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#include <stdio.h> | |
#include <stdlib.h> | |
#include <dev/filemon/filemon.h> | |
#include <sys/wait.h> | |
#include <sys/ioctl.h> | |
#include <unistd.h> | |
#include <fcntl.h> | |
#include <unistd.h> | |
int main(int argc, char *argv[]) | |
{ | |
pid_t pid; | |
int filemon_fd, temp_fd; | |
int status; | |
char temp_path[] = "/tmp/filemonXXXXXXXX"; | |
filemon_fd = open("/dev/filemon", O_RDWR); | |
temp_fd = mkstemp(temp_path); | |
// give filemon the temp file to use | |
ioctl(filemon_fd, FILEMON_SET_FD, &temp_fd); | |
// children do not need these one they exec | |
fcntl(filemon_fd, F_SETFD, FD_CLOEXEC); | |
fcntl(temp_fd, F_SETFD, FD_CLOEXEC); | |
pid = fork(); | |
switch(pid) { | |
case -1: | |
fprintf(stderr, "cannot fork"); | |
break; | |
case 0: | |
pid = getpid(); | |
printf("pid= %d\n", pid); | |
printf("filemon= %s\n", temp_path); | |
// tell filemon to monitor this process | |
ioctl(filemon_fd, FILEMON_SET_PID, &pid); | |
char *args[] = { "/usr/pkg/bin/bash", NULL }; | |
execvp("/usr/pkg/bin/bash", args); | |
_exit(1); | |
break; | |
default: | |
wait(&status); | |
close(filemon_fd); | |
lseek(temp_fd, SEEK_SET, 0); | |
// read the captured syscalls from temp_fd | |
close(temp_fd); | |
break; | |
} | |
return 0; | |
} |
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