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server/client: add support for sending SIGUSR to footclient

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This patch adds the IPC infrastructure necessary to propagate
SIGUSR1/SIGUSR2 from a footclient process to the server process.

By targeting a particular footclient instance, only that particular
instance changes theme. This is different from when targeting the
server process, where all instances change theme.

Closes #2156
This commit is contained in:
Daniel Eklöf 2025-07-31 17:37:19 +02:00
parent 70d99a8051
commit b13a8f12d2
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GPG key ID: 5BBD4992C116573F
6 changed files with 151 additions and 12 deletions
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59
server.c
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@ -156,10 +156,61 @@ fdm_client(struct fdm *fdm, int fd, int events, void *data)
xassert(events & EPOLLIN);
if (client->instance != NULL) {
uint8_t dummy[128];
ssize_t count = read(fd, dummy, sizeof(dummy));
LOG_WARN("client unexpectedly sent %zd bytes", count);
return true; /* TODO: shutdown instead? */
struct client_ipc_hdr ipc_hdr;
ssize_t count = read(fd, &ipc_hdr, sizeof(ipc_hdr));
if (count != sizeof(ipc_hdr)) {
LOG_WARN("client unexpectedly sent %zd bytes", count);
return true; /* TODO: shutdown instead? */
}
switch (ipc_hdr.ipc_code) {
case FOOT_IPC_SIGUSR: {
xassert(ipc_hdr.size == sizeof(struct client_ipc_sigusr));
struct client_ipc_sigusr sigusr;
count = read(fd, &sigusr, sizeof(sigusr));
if (count < 0) {
LOG_ERRNO("failed to read SIGUSR IPC data from client");
return true; /* TODO: shutdown instead? */
}
if ((size_t)count != sizeof(sigusr)) {
LOG_ERR("failed to read SIGUSR IPC data from client");
return true; /* TODO: shutdown instead? */
}
switch (sigusr.signo) {
case SIGUSR1:
term_theme_switch_to_1(client->instance->terminal);
break;
case SIGUSR2:
term_theme_switch_to_2(client->instance->terminal);
break;
default:
LOG_ERR(
"client sent bad SIGUSR number: %d "
"(expected SIGUSR1=%d or SIGUSR2=%d)",
sigusr.signo, SIGUSR1, SIGUSR2);
break;
}
return true;
}
default:
LOG_WARN(
"client sent unrecognized IPC (0x%04x), ignoring %hhu bytes",
ipc_hdr.ipc_code, ipc_hdr.size);
/* TODO: slightly broken, since not all data is guaranteed
to be readable yet */
uint8_t dummy[ipc_hdr.size];
read(fd, dummy, ipc_hdr.size);
return true;
}
}
if (client->buffer.data == NULL) {