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/*
* Copyright (C) 2016- The University of Notre Dame
* This software is distributed under the GNU General Public License.
* See the file COPYING for details.
*/
#if !defined(HAS_OPENAT) || !defined(HAS_UTIMENSAT)
#include "compat-at.h"
#include "debug.h"
#include <dirent.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#ifndef PATH_MAX
#define PATH_MAX 1024
#endif
static int getfullpath (int dirfd, const char *path, char fullpath[PATH_MAX])
{
char dirpath[PATH_MAX] = ".";
if (path[0] == '/') {
dirpath[0] = 0;
} else if (dirfd != AT_FDCWD) {
#if defined(CCTOOLS_OPSYS_DARWIN)
if (fcntl(dirfd, F_GETPATH, dirpath) == -1)
return -1;
#elif defined(CCTOOLS_OPSYS_LINUX)
char dirpath[PATH_MAX];
char procpath[PATH_MAX];
snprintf(procpath, PATH_MAX, "/proc/self/fd/%d", dirfd);
if (readlink(procpath, dirpath, PATH_MAX) == -1)
return -1;
#else
# error "Cannot proceed without support for *at system calls."
#endif
}
int rc = snprintf(fullpath, PATH_MAX, "%s/%s", dirpath, path);
if (rc == -1)
abort();
else if (rc >= PATH_MAX)
return (errno = ENAMETOOLONG, -1);
debug(D_DEBUG, "full path %s", fullpath);
return 0;
}
#ifndef HAS_OPENAT
int cctools_faccessat (int dirfd, const char *path, int amode, int flag)
{
char fullpath[PATH_MAX];
if (getfullpath(dirfd, path, fullpath) == -1)
return -1;
(void)flag;
return access(fullpath, amode);
}
int cctools_fchmodat (int dirfd, const char *path, mode_t mode, int flag)
{
char fullpath[PATH_MAX];
if (getfullpath(dirfd, path, fullpath) == -1)
return -1;
(void)flag;
return chmod(fullpath, mode);
}
DIR *cctools_fdopendir (int dirfd)
{
char fullpath[PATH_MAX];
if (getfullpath(dirfd, ".", fullpath) == -1)
return NULL;
return opendir(fullpath);
}
int cctools_fstatat (int dirfd, const char *path, struct stat *buf, int flag)
{
char fullpath[PATH_MAX];
if (getfullpath(dirfd, path, fullpath) == -1)
return -1;
if (flag & AT_SYMLINK_NOFOLLOW) {
return lstat(fullpath, buf);
} else {
return stat(fullpath, buf);
}
}
int cctools_linkat (int dirfd, const char *path, int newdirfd, const char *newpath, int flag)
{
char fullpath[PATH_MAX];
if (getfullpath(dirfd, path, fullpath) == -1)
return -1;
char newfullpath[PATH_MAX];
if (getfullpath(newdirfd, newpath, newfullpath) == -1)
return -1;
(void)flag;
return link(fullpath, newfullpath);
}
int cctools_openat (int dirfd, const char *path, int oflag, mode_t cmode)
{
char fullpath[PATH_MAX];
if (getfullpath(dirfd, path, fullpath) == -1)
return -1;
return open(fullpath, oflag, cmode);
}
int cctools_mkdirat (int dirfd, const char *path, mode_t mode)
{
char fullpath[PATH_MAX];
if (getfullpath(dirfd, path, fullpath) == -1)
return -1;
return mkdir(fullpath, mode);
}
int cctools_readlinkat (int dirfd, const char *path, char *buf, size_t bufsize)
{
char fullpath[PATH_MAX];
if (getfullpath(dirfd, path, fullpath) == -1)
return -1;
return readlink(fullpath, buf, bufsize);
}
int cctools_renameat (int dirfd, const char *path, int newdirfd, const char *newpath)
{
char fullpath[PATH_MAX];
if (getfullpath(dirfd, path, fullpath) == -1)
return -1;
char newfullpath[PATH_MAX];
if (getfullpath(newdirfd, newpath, newfullpath) == -1)
return -1;
return rename(fullpath, newfullpath);
}
int cctools_symlinkat (const char *target, int dirfd, const char *path)
{
char fullpath[PATH_MAX];
if (getfullpath(dirfd, path, fullpath) == -1)
return -1;
return symlink(target, fullpath);
}
int cctools_unlinkat (int dirfd, const char *path, int flag)
{
char fullpath[PATH_MAX];
if (getfullpath(dirfd, path, fullpath) == -1)
return -1;
if (flag == AT_REMOVEDIR) {
return rmdir(fullpath);
} else {
return unlink(fullpath);
}
}
#endif /* HAS_OPENAT */
#ifndef HAS_UTIMENSAT
int cctools_utimensat (int dirfd, const char *path, const struct timespec times[2], int flag)
{
struct timeval tv[2] = {{.tv_sec = times[0].tv_sec}, {.tv_sec = times[1].tv_sec}};
char fullpath[PATH_MAX];
if (getfullpath(dirfd, path, fullpath) == -1)
return -1;
(void)flag;
return utimes(fullpath, tv);
}
#endif /* HAS_UTIMENSAT */
#endif /* !defined(HAS_OPENAT) || !defined(HAS_UTIMENSAT) */
/* vim: set noexpandtab tabstop=4: */
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