make ttyname[_r] return ENODEV rather than ENOENT

commit 0a950dcf15bb9f7274c804dca490e9e20e475f3e added checking that
the pathname a tty device was opened with actually matches the device,
which can fail to hold when a container inherits a tty from outside
the container. the error code added at the time was ENOENT; however,
discussions between affected applications and glibc developers
resulted in glibc adopting ENODEV as the error for this condition, and
this has now been documented in the man pages project as well. adopt
the same error code for consistency.

patch by Christian Brauner.

diff --git a/src/unistd/ttyname_r.c b/src/unistd/ttyname_r.c
index a38ba4f2b3ed628778d00f2b24c0faac4f88a5c2..33aa4ae1a73672f87307b1bd9aababf7508b8e98 100644 (file)
--- a/src/unistd/ttyname_r.c
+++ b/src/unistd/ttyname_r.c
@@ -23,7 +23,7 @@ int ttyname_r(int fd, char *name, size_t size)
        if (stat(name, &st1) || fstat(fd, &st2))
                return errno;
        if (st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino)
-               return ENOENT;
+               return ENODEV;
 
        return 0;
 }