58 lines
2.3 KiB
C
58 lines
2.3 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <mach/mach.h>
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#include <servers/bootstrap.h>
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/* our sending message structure */
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struct message_send {
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mach_msg_header_t header; /* header; must always be at the beginning of the message */
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uint32_t x; /* our data */
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};
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int main(void) {
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kern_return_t kr;
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mach_port_t send_port; /* this is the port exposed by our server, and where we will send our messages */
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/* we obstain the service port via launchd */
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kr = bootstrap_look_up(bootstrap_port, "test_service", &send_port);
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if (kr != KERN_SUCCESS) {
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printf("unable to find service.\n");
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return -1;
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}
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struct message_send *msg = malloc(sizeof(struct message_send)); /* allocate our sending instance */
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bzero(msg, sizeof(struct message_send)); /* remember to always zero out your message! junk data might corrupt it. */
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/* how to interpret the remote/local ports passed to mach_msg.
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* The first arg of this macro specifies how we will use the remote port (MACH_MSG_TYPE_COPY_SEND).
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* The second arg of this macro specifies how we will use the local port. We pass 0 since we don't
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* use a local port, so behaviour is unspecified.
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*/
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msg->header.msgh_bits = MACH_MSGH_BITS(MACH_MSG_TYPE_MOVE_SEND, 0);
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msg->header.msgh_remote_port = send_port; /* where to send the message */
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msg->header.msgh_size = sizeof(struct message_send); /* message size */
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msg->x = 1000; /* our data */
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kr = mach_msg(
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&(msg->header), /* our sending structure's header */
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MACH_SEND_MSG, /* we want to send */
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sizeof(struct message_send), /* send size */
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0, /* we are not receiving anything */
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MACH_PORT_NULL, /* we are not receiving anything */
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MACH_MSG_TIMEOUT_NONE, /* no timeout for send */
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MACH_PORT_NULL /* no notification port */
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);
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if (kr != MACH_MSG_SUCCESS) {
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printf("failed to send: %s\n", mach_error_string(kr));
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return -1;
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} else {
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printf("message sent!\n");
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}
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return 0;
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}
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