util/u_process: add util_get_process_exec_path

Reviewed-by: Marek Olšák <[email protected]>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4181>

1 files changed, 31 insertions, 0 deletions

diff --git a/src/util/u_process.c b/src/util/u_process.c
index b9328d58da4..686e4624429 100644
--- a/src/util/u_process.c
+++ b/src/util/u_process.c
@@ -26,12 +26,19 @@
  */
 
 #include "u_process.h"
+#include "detect_os.h"
+#include "macros.h"
 #include <string.h>
 #include <errno.h>
 #include <stdlib.h>
+#include <unistd.h>
 
 #undef GET_PROGRAM_NAME
 
+#if DETECT_OS_WINDOWS
+#include <windows.h>
+#endif
+
 #if defined(__linux__) && defined(HAVE_PROGRAM_INVOCATION_NAME)
 
 static char *path = NULL;
@@ -152,3 +159,27 @@ util_get_process_name(void)
 {
    return GET_PROGRAM_NAME();
 }
+
+size_t
+util_get_process_exec_path(char* process_path, size_t len)
+{
+#if DETECT_OS_WINDOWS
+   return GetModuleFileNameA(NULL, process_path, len);
+#elif DETECT_OS_UNIX
+   ssize_t r;
+
+   if ((r = readlink("/proc/self/exe", process_path, len)) > 0)
+      goto success;
+   if ((r = readlink("/proc/curproc/exe", process_path, len)) > 0)
+      goto success;
+   if ((r = readlink("/proc/curproc/file", process_path, len)) > 0)
+      goto success;
+
+    return 0;
+success:
+    process_path[r] = '\0';
+    return r;
+
+#endif
+   return 0;
+}