user/libc: BSD err.h, getprogname()

1 files changed, 17 insertions, 0 deletions

diff --git a/src/user/lib/_start2.c b/src/user/lib/_start2.c
index 6d1431f..0582dde 100644
--- a/src/user/lib/_start2.c
+++ b/src/user/lib/_start2.c
@@ -1,13 +1,30 @@
 #include <camellia/syscalls.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 #include <user/lib/elfload.h>
 
 int main(int argc, char **argv, char **envp);
 
+__attribute__((visibility("hidden")))
+extern char _image_base[];
+
+const char *shortname(const char *path) {
+	if (!path) return "unknown program";
+	const char *slash = strrchr(path, '/');
+	if (slash) return slash + 1;
+	return path;
+}
+
 _Noreturn void _start2(struct execdata *ed) {
+	const char *progname;
 	elf_selfreloc();
 	__setinitialcwd(ed->cwd);
+
+	progname = shortname(ed->argv[0]);
+	setprogname(progname);
+	_klogf("_start2 %s 0x%x", progname, _image_base);
+
 	exit(main(ed->argc, ed->argv, ed->envp));
 }