include/fileutils.h

   1 #ifndef UTIL_LINUX_FILEUTILS
   2 #define UTIL_LINUX_FILEUTILS
   3
   4 #include <stdio.h>
   5 #include <fcntl.h>
   6 #include <unistd.h>
   7 #include <dirent.h>
   8 #include <sys/stat.h>
   9
  10 #include "c.h"
  11
  12 extern int mkstemp_cloexec(char *template);
  13
  14 extern int xmkstemp(char **tmpname, const char *dir, const char *prefix);
  15
  16 static inline FILE *xfmkstemp(char **tmpname, const char *dir, const char *prefix)
  17 {
  18         int fd;
  19         FILE *ret;
  20
  21         fd = xmkstemp(tmpname, dir, prefix);
  22         if (fd == -1)
  23                 return NULL;
  24
  25         if (!(ret = fdopen(fd, "w+" UL_CLOEXECSTR))) {
  26                 close(fd);
  27                 return NULL;
  28         }
  29         return ret;
  30 }
  31
  32 #ifdef HAVE_OPENAT
  33 static inline FILE *fopen_at(int dir, const char *filename,
  34                              int flags, const char *mode)
  35 {
  36         int fd = openat(dir, filename, flags);
  37         if (fd < 0)
  38                 return NULL;
  39
  40         return fdopen(fd, mode);
  41 }
  42 #endif
  43
  44 static inline int is_same_inode(const int fd, const struct stat *st)
  45 {
  46         struct stat f;
  47
  48         if (fstat(fd, &f) < 0)
  49                 return 0;
  50         else if (f.st_dev != st->st_dev || f.st_ino != st->st_ino)
  51                 return 0;
  52         return 1;
  53 }
  54
  55 extern int dup_fd_cloexec(int oldfd, int lowfd);
  56 extern int get_fd_tabsize(void);
  57
  58 extern int mkdir_p(const char *path, mode_t mode);
  59 extern char *stripoff_last_component(char *path);
  60
  61 /* This is readdir()-like function, but skips "." and ".." directory entries */
  62 static inline struct dirent *xreaddir(DIR *dp)
  63 {
  64         struct dirent *d;
  65
  66         while ((d = readdir(dp))) {
  67                 if (!strcmp(d->d_name, ".") ||
  68                     !strcmp(d->d_name, ".."))
  69                         continue;
  70                 break;
  71         }
  72         return d;
  73 }
  74
  75 #endif /* UTIL_LINUX_FILEUTILS */