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SUFFIX_ATTACH_MEM(3) libdill Library Functions SUFFIX_ATTACH_MEM(3) NAME suffix_attach_mem - creates SUFFIX protocol on top of underlying socket SYNOPSIS #include <libdill.h> int suffix_attach_mem( int s, const void* suffix, size_t suffixlen, struct suffix_storage* mem); DESCRIPTION SUFFIX is a message-based protocol that delimits messages by specific byte sequences. For example, many protocols are line-based, with indi- vidual messages separated by CR+LF sequence. This function instantiates SUFFIX protocol on top of the underlying protocol. This function allows to avoid one dynamic memory allocation by storing the object in user-supplied memory. Unless you are hyper-optimizing use suffix_attach instead. s: Handle of the underlying socket. It must be a bytestream protocol. suffix: The delimiter byte sequence. suffixlen: The size of the delimiter, in bytes. mem: The structure to store the newly created object in. It must not be deallocated before the object is closed. The socket can be cleanly shut down using suffix_detach function. This function is not available if libdill is compiled with --dis- able-sockets option. RETURN VALUE In case of success the function returns newly created socket handle. In case of error it returns -1 and sets errno to one of the values be- low. ERRORS • EBADF: Invalid handle. • EMFILE: The maximum number of file descriptors in the process are al- ready open. • ENFILE: The maximum number of file descriptors in the system are al- ready open. • ENOMEM: Not enough memory. • ENOTSUP: The handle does not support this operation. • EPROTO: Underlying socket is not a bytestream socket. EXAMPLE int s = tcp_connect(&addr, -1); s = suffix_attach(s, " ", 2); msend(s, "ABC", 3, -1); char buf[256]; ssize_t sz = mrecv(s, buf, sizeof(buf), -1); s = suffix_detach(s, -1); tcp_close(s); SEE ALSO hclose(3) mrecv(3) mrecvl(3) msend(3) msendl(3) suffix_attach(3) suf- fix_detach(3) libdill SUFFIX_ATTACH_MEM(3)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLE | SEE ALSO
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