Hi, the readlink() example from: http://man7.org/linux/man-pages/man2/readlink.2.html relies on lstat()'s st_size, but that doesn't work for files contents created dynamically by the Linux kernel which often report a zero size, for example the link at: /sys/block/sda the example code will fail because stat.st_size reports zero and you try to read (stat.st_size + 1) which will succeed, which will generate the error : "symlink increased in size between lstat() and readlink()". Somewhat related, the same issue is true for reading regular text files, e.g: "/proc/filesystems" which will report stat.st_size = 0. My quick workaround: if (stat.st_size != 0) // work as usual else if (file_is_a_link) // malloc 4K of ram and try to readlink() into it else if (is_regular_file) // read() into a byte array that grows accordingly In case it matters, I'm using Ubuntu 16.04 amd64. -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
