compiled-tools/syncfs.c

   1
   2 #include <err.h>
   3 #include <errno.h>
   4 #include <string.h>     //strdup
   5 #include <stdio.h>      //printf
   6 #include <fcntl.h>      //O_*
   7 #define _GNU_SOURCE 1
   8 #include <sys/syscall.h>
   9
  10
  11 int syncfs(int fd)
  12 {
  13         return syscall(SYS_syncfs, fd);
  14 }
  15
  16 int main(int argc, char** argv)
  17 {
  18         char* path;
  19         int narg = 1;
  20         int fd;
  21
  22         if(argc > 1 && strcmp(argv[1], "--help")==0)
  23         {
  24                 printf(
  25 "Usage: syncfs [<PATH>]\n"
  26 "Request sync to the disk for the filesystem which <PATH> is on.\n"
  27 "<PATH> is the current directory by default.\n");
  28                 return 0;
  29         }
  30
  31         if(argc < 2)
  32         {
  33                 path = strdup(".");
  34                 goto have_path;
  35         }
  36         else
  37         {
  38                 while(narg < argc)
  39                 {
  40                         path = argv[narg];
  41
  42                         have_path:
  43                         fd = open(path, O_RDONLY);
  44                         if(fd == -1)
  45                         {
  46                                 err(errno, "%s: open", path);
  47                         }
  48                         else
  49                         {
  50                                 int ok = syncfs(fd);
  51                                 if(ok != 0)
  52                                 {
  53                                         warn("%s", path);
  54                                 }
  55                                 close(fd);
  56                         }
  57                         narg++;
  58                 }
  59         }
  60         return 0;
  61 }