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Implement the AT_SYMLINK_NOFOLLOW flag to fchmodat() by calling open at fchmod emulating lchmod()

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This commit is contained in:
John Scipione 2012-03-08 15:56:01 -05:00
parent bffc978823
commit 9b54745611
1 changed files with 22 additions and 1 deletions
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23
src/build/libroot/fs_darwin.cpp
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@ -146,6 +146,12 @@ faccessat(int fd, const char* path, int accessMode, int flag)
int
fchmodat(int fd, const char* path, mode_t mode, int flag)
{
if ((flag & AT_SYMLINK_NOFOLLOW) == 0 && flag != 0) {
// invalid flag
errno = EINVAL;
return -1;
}
if ((flag & AT_SYMLINK_NOFOLLOW) != 0) {
// do not dereference, instead return information about the link
// itself
@ -180,7 +186,16 @@ fchmodat(int fd, const char* path, mode_t mode, int flag)
return -1;
}
int status = chmod(fullPath, mode);
int status;
if ((flag & AT_SYMLINK_NOFOLLOW) != 0) {
// Since there is no lchmod(), fake it with open() and fchmod()
int fullfd = open(fullPath, O_RDONLY | O_SYMLINK);
status = fchmod(fullfd, mode);
close(fullfd);
} else
status = chmod(fullPath, mode);
free(fullPath);
return status;
}
@ -499,6 +514,12 @@ symlinkat(const char *oldPath, int fd, const char *newPath)
int
unlinkat(int fd, const char *path, int flag)
{
if ((flag & AT_REMOVEDIR) == 0 && flag != 0) {
// invalid flag
errno = EINVAL;
return -1;
}
if (fd == AT_FDCWD || path != NULL && path[0] == '/') {
// call rmdir() or unlink() ignoring fd
return (flag & AT_REMOVEDIR) != 0 ? rmdir(path) : unlink(path);