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gnutls_record_send_file(3) gnutls gnutls_record_send_file(3)


gnutls_record_send_file - API function


#include <gnutls/gnutls.h>

ssize_t gnutls_record_send_file(gnutls_session_t session, int fd, off_t * offset, size_t count);


is a gnutls_session_t type.
file descriptor from which to read data.
Is relative to file offset, denotes the starting location for reading. after function returns, it point to position following last read byte.
is the length of the data in bytes to be read from file and send.


This function sends data from fd . If KTLS (kernel TLS) is enabled, it will use the sendfile() system call to avoid overhead of copying data between user space and the kernel. Otherwise, this functionality is merely emulated by calling read() and gnutls_record_send(). If this implementation is suboptimal, check whether KTLS is enabled using gnutls_transport_is_ktls_enabled().

If offset is NULL then file offset is incremented by number of bytes send, otherwise file offset remains unchanged.


The number of bytes sent, or a negative error code.


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