Write to swaynag pipe fd directly on config errors

1 files changed, 103 insertions, 0 deletions

diff --git a/sway/swaynag.c b/sway/swaynag.c
new file mode 100644
index 00000000..2dc0cb21
--- /dev/null
+++ b/sway/swaynag.c
@@ -0,0 +1,103 @@
+#include <fcntl.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include "log.h"
+#include "sway/swaynag.h"
+
+void swaynag_clone(struct swaynag_instance *dest,
+                struct swaynag_instance *src) {
+        dest->args = src->args;
+        dest->pid = src->pid;
+        dest->fd[0] = src->fd[0];
+        dest->fd[1] = src->fd[1];
+        dest->detailed = src->detailed;
+}
+
+bool swaynag_spawn(const char *swaynag_command,
+                struct swaynag_instance *swaynag) {
+        if (swaynag->detailed) {
+                if (pipe(swaynag->fd) != 0) {
+                        wlr_log(WLR_ERROR, "Failed to create pipe for swaynag");
+                        return false;
+                }
+                fcntl(swaynag->fd[1], F_SETFD, FD_CLOEXEC);
+        }
+
+        pid_t pid;
+        if ((pid = fork()) == 0) {
+                if (swaynag->detailed) {
+                        close(swaynag->fd[1]);
+                        dup2(swaynag->fd[0], STDIN_FILENO);
+                        close(swaynag->fd[0]);
+                }
+
+                size_t length = strlen(swaynag_command) + strlen(swaynag->args) + 2;
+                char *cmd = malloc(length);
+                snprintf(cmd, length, "%s %s", swaynag_command, swaynag->args);
+                execl("/bin/sh", "/bin/sh", "-c", cmd, NULL);
+                _exit(0);
+        } else if (pid < 0) {
+                wlr_log(WLR_ERROR, "Failed to create fork for swaynag");
+                if (swaynag->detailed) {
+                        close(swaynag->fd[0]);
+                        close(swaynag->fd[1]);
+                }
+                return false;
+        }
+
+        if (swaynag->detailed) {
+                close(swaynag->fd[0]);
+        }
+        swaynag->pid = pid;
+        return true;
+}
+
+
+void swaynag_kill(struct swaynag_instance *swaynag) {
+        if (swaynag->pid > 0) {
+                kill(swaynag->pid, SIGTERM);
+                swaynag->pid = -1;
+        }
+}
+
+void swaynag_log(const char *swaynag_command, struct swaynag_instance *swaynag,
+                const char *fmt, ...) {
+        if (!swaynag->detailed) {
+                wlr_log(WLR_ERROR, "Attempting to write to non-detailed swaynag inst");
+                return;
+        }
+
+        if (swaynag->pid <= 0 && !swaynag_spawn(swaynag_command, swaynag)) {
+                return;
+        }
+
+        va_list args;
+        va_start(args, fmt);
+        size_t length = vsnprintf(NULL, 0, fmt, args) + 1;
+        va_end(args);
+
+        char *temp = malloc(length + 1);
+        if (!temp) {
+                wlr_log(WLR_ERROR, "Failed to allocate buffer for swaynag log entry.");
+                return;
+        }
+
+        va_start(args, fmt);
+        vsnprintf(temp, length, fmt, args);
+        va_end(args);
+
+        write(swaynag->fd[1], temp, length);
+
+        free(temp);
+}
+
+void swaynag_show(struct swaynag_instance *swaynag) {
+        if (swaynag->detailed && swaynag->pid > 0) {
+                close(swaynag->fd[1]);
+        }
+}
+