Use fork in swaygrab instead of popen.

1 files changed, 21 insertions, 10 deletions

diff --git a/swaygrab/main.c b/swaygrab/main.c
index c437653d..6e851899 100644
--- a/swaygrab/main.c
+++ b/swaygrab/main.c
@@ -9,6 +9,7 @@
 #include <stdint.h>
 #include <math.h>
 #include <time.h>
+#include <sys/wait.h>
 #include <json-c/json.h>
 #include "log.h"
 #include "ipc-client.h"
@@ -47,17 +48,27 @@ void grab_and_apply_magick(const char *file, const char *payload,
                 return;
         }
 
-        const char *fmt = "convert -depth 8 -size %dx%d+0 rgba:- -flip %s";
-        char *cmd = malloc(strlen(fmt) - 6 /*args*/
-                        + numlen(width) + numlen(height) + strlen(file) + 1);
-        sprintf(cmd, fmt, width, height, file);
+        char size[10 + 1 + 10 + 2 + 1]; // int32_t are max 10 digits
+        sprintf(size, "%dx%d+0", width, height);
 
-        FILE *f = popen(cmd, "w");
-        fwrite(pixels, 1, len, f);
-        fflush(f);
-        fclose(f);
-        free(pixels - 9);
-        free(cmd);
+        pid_t child;
+        int fd[2];
+        pipe(fd);
+
+        if ((child = fork()) < 0) {
+                sway_log(L_ERROR, "Swaygrab failed to fork.");
+                exit(EXIT_FAILURE);
+        } else if (child == 0) {
+                close(fd[1]);
+                write(fd[0], pixels, len);
+                free(pixels - 9);
+                waitpid(child, NULL, 0);
+        } else {
+                close(fd[0]);
+                execlp("convert", "-depth", "8", "-size", size, "rgba:-", "-flip", file, NULL);
+                sway_log(L_ERROR, "Swaygrab could not run convert.");
+                exit(EXIT_FAILURE);
+        }
 }
 
 void grab_and_apply_movie_magic(const char *file, const char *payload,