Man page - nng_msg_header_insert(3)

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Manual

NNG_MSG_HEADER_INSERT

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUES
ERRORS
SEE ALSO

NAME

nng_msg_header_insert - prepend to message header

SYNOPSIS

#include <nng/nng.h>

int nng_msg_header_insert(nng_msg *msg, const void *val, size_t size);
int nng_msg_header_insert_u16(nng_msg *msg, uint16_t val16);
int nng_msg_header_insert_u32(nng_msg *msg, uint32_t val32);
int nng_msg_header_insert_u64(nng_msg *msg, uint64_t val64);

DESCRIPTION

The nng_msg_header_insert() family of functions prepends data to the front of the headers of message msg , reallocating if necessary. The first function prepends size bytes, copying them from val . The remaining functions prepend the specified value (such as val32 ) in network-byte order (big-endian).

RETURN VALUES

These functions return 0 on success, and non-zero otherwise.

ERRORS

NNG_ENOMEM

Insufficient free memory exists.

SEE ALSO

nng_msg_alloc(3), nng_msg_header(3), nng_msg_header_append(3), nng_msg_header_chop(3), nng_msg_header_len(3), nng_msg_header_trim(3), nng_msg_free(3), nng_msg_capacity(3), nng_msg_reserve(3), nng_msg_realloc(3), nng_strerror(3), nng(7)