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util-linux/include/fileutils.h

100 lines
2.1 KiB

#ifndef UTIL_LINUX_FILEUTILS
#define UTIL_LINUX_FILEUTILS
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/stat.h>
#include "c.h"
extern int mkstemp_cloexec(char *template);
extern int xmkstemp(char **tmpname, const char *dir, const char *prefix);
static inline FILE *xfmkstemp(char **tmpname, const char *dir, const char *prefix)
{
int fd;
FILE *ret;
fd = xmkstemp(tmpname, dir, prefix);
if (fd == -1)
return NULL;
if (!(ret = fdopen(fd, "w+" UL_CLOEXECSTR))) {
close(fd);
return NULL;
}
return ret;
}
#ifdef HAVE_OPENAT
static inline FILE *fopen_at(int dir, const char *filename,
int flags, const char *mode)
{
int fd = openat(dir, filename, flags);
FILE *ret;
if (fd < 0)
return NULL;
ret = fdopen(fd, mode);
if (!ret)
close(fd);
return ret;
}
#endif
static inline int is_same_inode(const int fd, const struct stat *st)
{
struct stat f;
if (fstat(fd, &f) < 0)
return 0;
else if (f.st_dev != st->st_dev || f.st_ino != st->st_ino)
return 0;
return 1;
}
extern int dup_fd_cloexec(int oldfd, int lowfd);
extern unsigned int get_fd_tabsize(void);
extern int ul_mkdir_p(const char *path, mode_t mode);
extern char *stripoff_last_component(char *path);
/* This is readdir()-like function, but skips "." and ".." directory entries */
static inline struct dirent *xreaddir(DIR *dp)
{
struct dirent *d;
while ((d = readdir(dp))) {
if (!strcmp(d->d_name, ".") ||
!strcmp(d->d_name, ".."))
continue;
break;
}
return d;
}
#ifdef HAVE_SYS_SYSCALL_H
# include <sys/syscall.h>
# if defined(SYS_close_range)
# include <sys/types.h>
# ifndef HAVE_CLOSE_RANGE
static inline int close_range(unsigned int first, unsigned int last, int flags)
{
return syscall(SYS_close_range, first, last, flags);
}
# endif
# define HAVE_CLOSE_RANGE 1
# endif /* SYS_close_range */
#endif /* HAVE_SYS_SYSCALL_H */
extern void ul_close_all_fds(unsigned int first, unsigned int last);
#define UL_COPY_READ_ERROR (-1)
#define UL_COPY_WRITE_ERROR (-2)
int ul_copy_file(int from, int to);
#endif /* UTIL_LINUX_FILEUTILS */