J'essaie de configurer un message mach pour envoyer une chaîne hors ligne en utilisant mach IPC. Cependant, j'obtiens une erreur (ipc/send) invalid msg-header
lorsque j'essaie d'envoyer le message hors ligne.Configurer l'en-tête de message mach complexe
Voici la structure du message.
struct ool_msg
{
mach_msg_header_t header;
mach_msg_body_t body;
mach_msg_ool_descriptor_t data;
mach_msg_type_number_t count;
};
Je configure l'en-tête comme ceci. La variable msg
ci-dessous est un struct ool_msg
.
hdr = &(msg.header);
hdr->msgh_bits = MACH_MSGH_BITS_LOCAL(MACH_MSG_TYPE_COPY_SEND);
hdr->msgh_bits |= MACH_MSGH_BITS_COMPLEX;
hdr->msgh_size = sizeof(msg);
hdr->msgh_local_port = MACH_PORT_NULL;
hdr->msgh_remote_port = port;
Voici comment je configure le reste du message Mach. Comment puis-je configurer correctement l'en-tête du message pour l'IPC Mach OCL?
Édition
Voici un programme qui reproduit mon problème.
#include <stdio.h>
#include <mach/mach.h>
static char *string = "123456789";
struct ool_msg
{
mach_msg_header_t header;
mach_msg_body_t body;
mach_msg_ool_descriptor_t data;
mach_msg_type_number_t count;
};
int main(void)
{
kern_return_t err;
struct ool_msg msg;
mach_msg_header_t *hdr;
mach_port_t port = MACH_PORT_NULL;
err = mach_port_allocate(mach_task_self(), MACH_PORT_RIGHT_RECEIVE, &port);
if(err != KERN_SUCCESS)
{
mach_error("Can't allocate mach port\n", err);
return (-1);
}
err = mach_port_insert_right(mach_task_self(), port, port,
MACH_MSG_TYPE_MAKE_SEND);
if(err != KERN_SUCCESS)
{
mach_error("Can't insert port right\n", err);
return (-1);
}
hdr = &(msg.header);
hdr->msgh_bits = MACH_MSGH_BITS_LOCAL(MACH_MSG_TYPE_COPY_SEND);
hdr->msgh_bits |= MACH_MSGH_BITS_COMPLEX;
hdr->msgh_size = sizeof(msg);
hdr->msgh_local_port = MACH_PORT_NULL;
hdr->msgh_remote_port = port;
msg.body.msgh_descriptor_count = 1;
msg.data.address = string;
msg.data.size = strlen(string) + 1;
msg.data.deallocate = FALSE;
msg.data.copy = MACH_MSG_VIRTUAL_COPY;
msg.data.type = MACH_MSG_OOL_DESCRIPTOR;
msg.count = msg.data.size;
err = mach_msg(hdr,
MACH_SEND_MSG,
hdr->msgh_size,
0,
MACH_PORT_NULL,
MACH_MSG_TIMEOUT_NONE,
MACH_PORT_NULL);
if(err != KERN_SUCCESS)
{
mach_error("Can't send mach msg\n", err);
return (-1);
}
return (0);
}
Comment exactement vous essayez d'envoyer la chaîne? Pourriez-vous créer un [exemple minimal, complet et vérifiable] (http://stackoverflow.com/help/mcve)? –
@JoshdeKock J'ai ajouté un exemple. – 2trill2spill