gri3-wm/libi3/ipc_send_message.c

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/*
* vim:ts=4:sw=4:expandtab
*
* i3 - an improved dynamic tiling window manager
* © 2009-2013 Michael Stapelberg and contributors (see also: LICENSE)
*
*/
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <err.h>
#include <errno.h>
#include <i3/ipc.h>
#include "libi3.h"
/*
* Formats a message (payload) of the given size and type and sends it to i3 via
* the given socket file descriptor.
*
* Returns -1 when write() fails, errno will remain.
* Returns 0 on success.
*
*/
int ipc_send_message(int sockfd, const uint32_t message_size,
const uint32_t message_type, const uint8_t *payload) {
const i3_ipc_header_t header = {
/* We dont use I3_IPC_MAGIC because its a 0-terminated C string. */
.magic = {'i', '3', '-', 'i', 'p', 'c'},
.size = message_size,
.type = message_type};
size_t sent_bytes = 0;
int n = 0;
/* This first loop is basically unnecessary. No operating system has
* buffers which cannot fit 14 bytes into them, so the write() will only be
* called once. */
while (sent_bytes < sizeof(i3_ipc_header_t)) {
if ((n = write(sockfd, ((void *)&header) + sent_bytes, sizeof(i3_ipc_header_t) - sent_bytes)) == -1) {
if (errno == EAGAIN)
continue;
return -1;
}
sent_bytes += n;
}
sent_bytes = 0;
while (sent_bytes < message_size) {
if ((n = write(sockfd, payload + sent_bytes, message_size - sent_bytes)) == -1) {
if (errno == EAGAIN)
continue;
return -1;
}
sent_bytes += n;
}
return 0;
}