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Implement linkat()

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This commit is contained in:
John Scipione 2012-03-05 19:24:58 -05:00
parent 263ac66935
commit a598261fea
2 changed files with 108 additions and 5 deletions
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109
src/build/libroot/fs_darwin.cpp
View File

@ -761,10 +761,113 @@ unlinkat(int fd, const char *path, int flag)
int
linkat(int toFD, const char *toPath, int linkFD, const char *linkPath, int flag)
linkat(int oldFD, const char *oldPath, int newFD, const char *newPath,
int flag)
{
errno = ENOSYS;
return -1;
if ((flag & AT_SYMLINK_FOLLOW) == 0) {
// Dereference oldPath
// CURRENTLY UNSUPPORTED
errno = ENOTSUP;
return -1;
} else if (flag != 0) {
errno = EINVAL;
return -1;
}
bool oldIsAbsolute = false;
bool newIsAbsolute = false;
if (oldPath && oldPath[0] == '/')
oldIsAbsolute = true;
if (newPath && newPath[0] == '/')
newIsAbsolute = true;
if (oldIsAbsolute && newIsAbsolute) {
// oldPath and newPath are both absolute, call link() ignoring the fd's
return link(oldPath, newPath);
}
if ((!oldIsAbsolute && !oldFD) || (!newIsAbsolute && !newFD)) {
// oldPath is not an absolute path and oldFD is not a valid file
// descriptor or newPath is not an absolute path and newFD is not a
// valid file descriptor
errno = EBADF;
return -1;
}
char *oldDirPath;
char *newDirPath;
if (oldIsAbsolute || oldFD == AT_FDCWD)
oldDirPath = const_cast<char *>(oldPath);
else {
oldDirPath = (char *)malloc(MAXPATHLEN);
if (oldDirPath == NULL) {
// ran out of memory allocating oldDirPath
errno = ENOMEM;
return -1;
}
struct stat dirst;
if (fstat(oldFD, &dirst) < 0) {
// failed to grab stat information, fstat() sets errno
return -1;
}
if ((dirst.st_mode & S_IFDIR) != 0) {
// fd does not point to a directory
errno = ENOTDIR;
return -1;
}
if (fcntl(oldFD, F_GETPATH, oldDirPath) < 0) {
// failed to get the path of oldFD, fcntl sets errno
return -1;
}
if (strlcat(oldDirPath, oldPath, MAXPATHLEN) > MAXPATHLEN) {
// full path is too long, set errno and return
errno = ENAMETOOLONG;
return -1;
}
}
if (newIsAbsolute || newFD == AT_FDCWD)
newDirPath = const_cast<char *>(newPath);
else {
newDirPath = (char *)malloc(MAXPATHLEN);
if (newDirPath == NULL) {
// ran out of memory allocating newDirPath
errno = ENOMEM;
return -1;
}
struct stat dirst;
if (fstat(newFD, &dirst) < 0) {
// failed to grab stat information, fstat() sets errno
return -1;
}
if ((dirst.st_mode & S_IFDIR) != 0) {
// fd does not point to a directory
errno = ENOTDIR;
return -1;
}
if (fcntl(newFD, F_GETPATH, newDirPath) < 0) {
// failed to get the path of newFD, fcntl sets errno
return -1;
}
if (strlcat(newDirPath, newPath, MAXPATHLEN) > MAXPATHLEN) {
// full path is too long, set errno and return
errno = ENAMETOOLONG;
return -1;
}
}
return link(oldDirPath, newDirPath);
}

4
src/build/libroot/fs_darwin.h
View File

@ -28,8 +28,8 @@ int renameat(int fromFD, const char* from, int toFD, const char* to);
ssize_t readlinkat(int fd, const char *path, char *buffer, size_t bufferSize);
int symlinkat(const char *toPath, int fd, const char *symlinkPath);
int unlinkat(int fd, const char *path, int flag);
int linkat(int toFD, const char *toPath, int linkFD, const char *linkPath,
int flag);
int linkat(int oldFD, const char *oldPath, int newFD, const char *newPath,
int flag);
int futimesat(int fd, const char *path, const struct timeval times[2]);