/* written by Jim Meyering */
-#include <config.h>
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
/* Disable the definition of chown to rpl_chown (from config.h) in this
file. Otherwise, we'd get conflicting prototypes for rpl_chown on
most systems. */
#undef chown
+#include <stdbool.h>
#include <sys/types.h>
#include <sys/stat.h>
-#if HAVE_UNISTD_H
-# include <unistd.h>
-#endif
+#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
+#include "stat-macros.h"
+
/* Provide a more-closely POSIX-conforming version of chown on
systems with one or both of the following problems:
- chown doesn't treat an ID of -1 as meaning
on the symlink itself. To work around that, we open the
file (but this can fail due to lack of read or write permission) and
use fchown on the resulting descriptor. */
- int fd = open (file, O_RDONLY | O_NONBLOCK | O_NOCTTY);
- if (fd < 0
- && (fd = open (file, O_WRONLY | O_NONBLOCK | O_NOCTTY)) < 0)
- return -1;
- if (fchown (fd, uid, gid))
+ int open_flags = O_NONBLOCK | O_NOCTTY;
+ int fd = open (file, O_RDONLY | open_flags);
+ if (0 <= fd
+ || (errno == EACCES
+ && 0 <= (fd = open (file, O_WRONLY | open_flags))))
{
+ int result = fchown (fd, uid, gid);
int saved_errno = errno;
+
+ /* POSIX says fchown can fail with errno == EINVAL on sockets,
+ so fall back on chown in that case. */
+ struct stat sb;
+ bool fchown_socket_failure =
+ (result != 0 && saved_errno == EINVAL
+ && fstat (fd, &sb) == 0 && S_ISFIFO (sb.st_mode));
+
close (fd);
- errno = saved_errno;
- return -1;
+
+ if (! fchown_socket_failure)
+ {
+ errno = saved_errno;
+ return result;
+ }
}
- return close (fd);
+ else if (errno != EACCES)
+ return -1;
}
-#else
- return chown (file, uid, gid);
#endif
+
+ return chown (file, uid, gid);
}