libc: re-implement getuser() by stating /proc/$pid/status

The idea is to avoid the magic files that contain
per process information in devcons when possible.
It will make it easier to deprecate them in the future.

1 files changed, 17 insertions, 0 deletions

diff --git a/sys/src/libc/9sys/getuser.c b/sys/src/libc/9sys/getuser.c
new file mode 100644
index 000000000..487a88aaf
--- /dev/null
+++ b/sys/src/libc/9sys/getuser.c
@@ -0,0 +1,17 @@
+#include <u.h>
+#include <libc.h>
+
+char *
+getuser(void)
+{
+	static char user[64];
+	char name[32];
+	Dir *dir;
+
+	snprint(name, sizeof(name), "/proc/%lud/status", (ulong)getpid());
+	if((dir = dirstat(name)) == nil)
+		return "none";
+	snprint(user, sizeof(user), "%s", dir->uid);
+	free(dir);
+	return user;
+}