f5b7bfb12e
Use the following command to reproduce this bug:
echo 4096 | sudo tee /proc/sys/net/core/wmem_default
Then just switch workspaces with some windows on it and i3bar would
exit due to malformed IPC messages.
This bug hits OpenBSD users (and possibly other BSDs) due to their lower
default buffer size.
fixes #896
55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
/*
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* vim:ts=4:sw=4:expandtab
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*
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* i3 - an improved dynamic tiling window manager
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* © 2009-2011 Michael Stapelberg and contributors (see also: LICENSE)
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*
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*/
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <err.h>
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#include <errno.h>
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#include <i3/ipc.h>
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#include "libi3.h"
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/*
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* Formats a message (payload) of the given size and type and sends it to i3 via
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* the given socket file descriptor.
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*
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* Returns -1 when write() fails, errno will remain.
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* Returns 0 on success.
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*
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*/
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int ipc_send_message(int sockfd, uint32_t message_size,
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uint32_t message_type, const uint8_t *payload) {
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int buffer_size = strlen(I3_IPC_MAGIC) + sizeof(uint32_t) + sizeof(uint32_t) + message_size;
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char msg[buffer_size];
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char *walk = msg;
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strncpy(walk, I3_IPC_MAGIC, buffer_size - 1);
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walk += strlen(I3_IPC_MAGIC);
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memcpy(walk, &message_size, sizeof(uint32_t));
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walk += sizeof(uint32_t);
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memcpy(walk, &message_type, sizeof(uint32_t));
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walk += sizeof(uint32_t);
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memcpy(walk, payload, message_size);
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int sent_bytes = 0;
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while (sent_bytes < buffer_size) {
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int n = write(sockfd, msg + sent_bytes, buffer_size - sent_bytes);
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if (n == -1) {
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if (errno == EAGAIN)
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continue;
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return -1;
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}
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sent_bytes += n;
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}
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return 0;
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}
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