Get the remote exit signal
#include <libssh2.h>
int libssh2_channel_get_exit_signal(LIBSSH2_CHANNEL *channel, char **exitsignal, size_t *exitsignal_len, char **errmsg, size_t *errmsg_len, char **langtag, size_t *langtag_len);
channel - Closed channel stream to retrieve exit signal from.
exitsignal - If not NULL, is populated by reference with the exit signal (without leading "SIG"). Note that the string is stored in a newly allocated buffer. If the remote program exited cleanly, the referenced string pointer will be set to NULL.
exitsignal_len - If not NULL, is populated by reference with the length of exitsignal.
errmsg - If not NULL, is populated by reference with the error message (if provided by remote server, if not it will be set to NULL). Note that the string is stored in a newly allocated buffer.
errmsg_len - If not NULL, is populated by reference with the length of errmsg.
langtag - If not NULL, is populated by reference with the language tag (if provided by remote server, if not it will be set to NULL). Note that the string is stored in a newly allocated buffer.
langtag_len - If not NULL, is populated by reference with the length of langtag.
Numeric error code corresponding to the the Error Code constants.