https://bugzilla.kernel.org/show_bug.cgi?id=104561 Bug ID: 104561 Summary: Autobind in unix domain sockets always requires call to bind Product: Documentation Version: unspecified Hardware: All OS: Linux Status: NEW Severity: normal Priority: P1 Component: man-pages Assignee: documentation_man-pages@xxxxxxxxxxxxxxxxxxxx Reporter: a0vhv@xxxxxxxxxxx Regression: No Created attachment 187571 --> https://bugzilla.kernel.org/attachment.cgi?id=187571&action=edit Example code that shows bind() is necessary for autobind In "man 7 unix" it says: "If a bind(2) call specifies addrlen as sizeof(sa_family_t), or the SO_PASSCRED socket option was specified for a socket that was not explicitly bound to an address, then the socket is autobound to an abstract address." However, only setting SO_PASSCRED is not enough to autobind. You always have to call bind, as you can see in the attached example. If you run it, every call should succeed and getsockname reports that the autobind address has a size of 8 bytes. Now remove lines 20-22, so the socket gets no longer explicitly bound. getsockname reports that the address size is 2 bytes (because bound_addr.sun_path is not used) and the call to "listen" fails. So it seems the call to "bind" is necessary even if SO_PASSCRED is used. -- You are receiving this mail because: You are watching the assignee of the bug. -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
