util/oslib-posix.c: Implement qemu_init_exec_dir() for Haiku

The qemu_init_exec_dir() function is inherently non-portable;
provide an implementation for Haiku hosts.

Signed-off-by: David Carlier <devnexen@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20200703145614.16684-9-peter.maydell@linaro.org
[PMM: Expanded commit message]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/util/oslib-posix.c b/util/oslib-posix.c
index 7ad9195c44..72907d4d7f 100644
--- a/util/oslib-posix.c
+++ b/util/oslib-posix.c
@@ -60,6 +60,10 @@
 #include <mach-o/dyld.h>
 #endif
 
+#ifdef __HAIKU__
+#include <kernel/image.h>
+#endif
+
 #include "qemu/mmap-alloc.h"
 
 #ifdef CONFIG_DEBUG_STACK_USAGE
@@ -389,6 +393,21 @@ void qemu_init_exec_dir(const char *argv0)
             }
         }
     }
+#elif defined(__HAIKU__)
+    {
+        image_info ii;
+        int32_t c = 0;
+
+        *buf = '\0';
+        while (get_next_image_info(0, &c, &ii) == B_OK) {
+            if (ii.type == B_APP_IMAGE) {
+                strncpy(buf, ii.name, sizeof(buf));
+                buf[sizeof(buf) - 1] = 0;
+                p = buf;
+                break;
+            }
+        }
+    }
 #endif
     /* If we don't have any way of figuring out the actual executable
        location then try argv[0].  */