fixed nonsense with truncation

src/lcpex/helpers.cpp

@@ -0,0 +1,15 @@
+#include "helpers.h"
+
+ssize_t write_all(int fd, const void *buf, size_t count) {
+    const char *p = (const char *)buf;
+    while (count > 0) {
+        ssize_t written = write(fd, p, count);
+        if (written == -1) {
+            if (errno == EINTR || errno == EAGAIN) continue; // Retry
+            return -1; // Other errors
+        }
+        count -= written;
+        p += written;
+    }
+    return 0;
+}

src/lcpex/helpers.h

@@ -1,6 +1,9 @@
 #ifndef LCPEX_HELPERS_H
 #define LCPEX_HELPERS_H
 
+#include <unistd.h>
+#include "errno.h"
+
 // helper for sanity
 enum PIPE_ENDS {
     READ_END = 0,
@@ -16,18 +19,6 @@ enum CHILD_PIPE_NAMES {
 
 #define BUFFER_SIZE 1024
 
-ssize_t write_all(int fd, const void *buf, size_t count) {
-    const char *p = (const char *)buf;
-    while (count > 0) {
-        ssize_t written = write(fd, p, count);
-        if (written == -1) {
-            if (errno == EINTR || errno == EAGAIN) continue; // Retry
-            return -1; // Other errors
-        }
-        count -= written;
-        p += written;
-    }
-    return 0;
-}
+ssize_t write_all(int fd, const void *buf, size_t count);
 
 #endif //LCPEX_HELPERS_H