/proc/self/cmdline:
./../procfs-cmdline-exe\0arg1\0arg 2\0arg3\0
/proc/<pid>/cmdline:
./../procfs-cmdline-exe\0arg1\0arg 2\0arg3\0
readlink: No such file or directory
readlink: No such file or directory
readlinkat: No such file or directory
readlinkat: No such file or directory