Re: [Libguestfs] [libnbd PATCH v3 19/29] CONNECT_COMMAND.START: set the NBD error when fcntl() fails

Furthermore, explain in a comment that *not* calling set_error() upon nbd_internal_socket_create() failing is intentional, and not an omission. Signed-off-by: Laszlo Ersek <lersek(a)redhat.com&gt; --- Notes: context:-W generator/states-connect.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/generator/states-connect.c b/generator/states-connect.c index 95a96b9114c6..83d7f316828e 100644 --- a/generator/states-connect.c +++ b/generator/states-connect.c @@ -240,71 +240,73 @@ CONNECT_TCP.NEXT_ADDRESS: CONNECT_COMMAND.START: int sv[2]; pid_t pid; int flags; assert (!h->sock); assert (h->argv.ptr); assert (h->argv.ptr[0]); if (nbd_internal_socketpair (AF_UNIX, SOCK_STREAM, 0, sv) == -1) { SET_NEXT_STATE (%.DEAD); set_error (errno, "socketpair"); return 0; } pid = fork (); if (pid == -1) { SET_NEXT_STATE (%.DEAD); set_error (errno, "fork"); close (sv[0]); close (sv[1]); return 0; } if (pid == 0) { /* child - run command */ close (0); close (1); close (sv[0]); dup2 (sv[1], 0); dup2 (sv[1], 1); close (sv[1]); /* Restore SIGPIPE back to SIG_DFL. */ signal (SIGPIPE, SIG_DFL); execvp (h->argv.ptr[0], h->argv.ptr); nbd_internal_fork_safe_perror (h->argv.ptr[0]); if (errno == ENOENT) _exit (127); else _exit (126); } /* Parent. */ close (sv[1]); h->pid = pid; /* Only the parent-side end of the socket pair must be set to non-blocking, * because the child may not be expecting a non-blocking socket. */ flags = fcntl (sv[0], F_GETFL, 0); if (flags == -1 || fcntl (sv[0], F_SETFL, flags|O_NONBLOCK) == -1) { SET_NEXT_STATE (%.DEAD); + set_error (errno, "fcntl"); close (sv[0]); return 0; } h->sock = nbd_internal_socket_create (sv[0]); if (!h->sock) { SET_NEXT_STATE (%.DEAD); + /* nbd_internal_socket_create() calls set_error() internally */ close (sv[0]); return 0; } /* The sockets are connected already, we can jump directly to * receiving the server magic. */ SET_NEXT_STATE (%^MAGIC.START); return 0; } /* END STATE MACHINE */