restarttest.c

#define _GNU_SOURCE
#define _XOPEN_SOURCE 500   /* See feature_test_macros(7) */
#include <ftw.h>
#include<stdio.h>
#include <string.h>
#include <sys/time.h>
#include <time.h>
#include <unistd.h>
struct timespec start;
int argc;
const char** argv;
// Adapted from timercmp for timespec
# define timespeccmp(a, b, CMP) 						      \
  (((a)->tv_sec == (b)->tv_sec) 					      \
   ? ((a)->tv_nsec CMP (b)->tv_nsec) 					      \
   : ((a)->tv_sec CMP (b)->tv_sec))
#ifndef FTW_STOP
#define FTW_STOP 1
#endif
#ifndef FTW_CONTINUE
#define FTW_CONTINUE 0
#endif
int callback (const char* filename, const struct stat* status, int flag, struct FTW *__info)
{
    for(int i=2;i<argc;i++) {
        if(strncmp(filename, argv[i], strlen(argv[i])) == 0) {
#ifdef FTW_SKIP_SUBTREE
            return FTW_SKIP_SUBTREE;
#else
            return FTW_CONTINUE; // Continue with the files despite knowing we will ignore them in the future
#endif
        }
    }
    // Check if the time is later than the last
    if(timespeccmp(&start, &(status->st_mtim), <) || timespeccmp(&start, &(status->st_ctim), <))
    {
        // Found newly modified file
        return FTW_STOP;
    }
    return FTW_CONTINUE;
}
int main(int _argc, const char** _argv)
{
    argc = _argc;
    argv = _argv;
    if(argc<2) {
        printf("%s", "Required parameter: directory to watch\n");
        return 1;
    }
    clock_gettime(CLOCK_REALTIME, &start);
    while(nftw(argv[1], callback, 10, 
#ifdef FTW_ACTIONRETVAL
        FTW_ACTIONRETVAL
#else
        0
#endif
    ) != FTW_STOP);
    return 0;
}