include/fileutils.h

   1 /*
   2  * No copyright is claimed.  This code is in the public domain; do with
   3  * it what you wish.
   4  **/
   5 #ifndef UTIL_LINUX_FILEUTILS
   6 #define UTIL_LINUX_FILEUTILS
   7
   8 #include <stdio.h>
   9 #include <fcntl.h>
  10 #include <unistd.h>
  11 #include <dirent.h>
  12 #include <sys/stat.h>
  13
  14 #include "c.h"
  15
  16 extern int mkstemp_cloexec(char *template);
  17
  18 extern int xmkstemp(char **tmpname, const char *dir, const char *prefix);
  19
  20 static inline FILE *xfmkstemp(char **tmpname, const char *dir, const char *prefix)
  21 {
  22         int fd;
  23         FILE *ret;
  24
  25         fd = xmkstemp(tmpname, dir, prefix);
  26         if (fd == -1)
  27                 return NULL;
  28
  29         if (!(ret = fdopen(fd, "w+" UL_CLOEXECSTR))) {
  30                 close(fd);
  31                 return NULL;
  32         }
  33         return ret;
  34 }
  35
  36 #ifdef HAVE_OPENAT
  37 static inline FILE *fopen_at(int dir, const char *filename,
  38                              int flags, const char *mode)
  39 {
  40         int fd = openat(dir, filename, flags);
  41         FILE *ret;
  42
  43         if (fd < 0)
  44                 return NULL;
  45
  46         ret = fdopen(fd, mode);
  47         if (!ret)
  48                 close(fd);
  49         return ret;
  50 }
  51 #endif
  52
  53 static inline int is_same_inode(const int fd, const struct stat *st)
  54 {
  55         struct stat f;
  56
  57         if (fstat(fd, &f) < 0)
  58                 return 0;
  59         else if (f.st_dev != st->st_dev || f.st_ino != st->st_ino)
  60                 return 0;
  61         return 1;
  62 }
  63
  64 extern int dup_fd_cloexec(int oldfd, int lowfd);
  65 extern unsigned int get_fd_tabsize(void);
  66
  67 extern int ul_mkdir_p(const char *path, mode_t mode);
  68 extern char *stripoff_last_component(char *path);
  69
  70 /* This is readdir()-like function, but skips "." and ".." directory entries */
  71 static inline struct dirent *xreaddir(DIR *dp)
  72 {
  73         struct dirent *d;
  74
  75         while ((d = readdir(dp))) {
  76                 if (!strcmp(d->d_name, ".") ||
  77                     !strcmp(d->d_name, ".."))
  78                         continue;
  79                 break;
  80         }
  81         return d;
  82 }
  83
  84
  85 #ifdef HAVE_SYS_SYSCALL_H
  86 # include <sys/syscall.h>
  87
  88 # if !defined(HAVE_CLOSE_RANGE) && defined(SYS_close_range)
  89 #  include <sys/types.h>
  90 static inline int close_range(unsigned int first, unsigned int last, int flags)
  91 {
  92         return syscall(SYS_close_range, first, last, flags);
  93 }
  94 #  define HAVE_CLOSE_RANGE 1
  95 # endif /* SYS_close_range */
  96
  97 # if !defined(HAVE_STATX) && defined(HAVE_STRUCT_STATX) && defined(SYS_statx)
  98 static inline int statx(int fd, const char *restrict path, int flags,
  99                     unsigned int mask, struct statx *stx)
 100 {
 101         return syscall(SYS_statx, fd, path, flags, mask, stx);
 102 }
 103 #  define HAVE_STATX 1
 104 # endif /* SYS_statx */
 105
 106 #endif  /* HAVE_SYS_SYSCALL_H */
 107
 108
 109 extern void ul_close_all_fds(unsigned int first, unsigned int last);
 110
 111 #define UL_COPY_READ_ERROR (-1)
 112 #define UL_COPY_WRITE_ERROR (-2)
 113 int ul_copy_file(int from, int to);
 114
 115
 116 extern int ul_reopen(int fd, int flags);
 117
 118 #endif /* UTIL_LINUX_FILEUTILS */