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long symlink_max;
size_t bufsize;
char *buf;
ssize_t len;

errno = 0;
symlink_max = pathconf("/usr/bin/", _PC_SYMLINK_MAX);
if (symlink_max == -1) {
    if (errno != 0) {
        /* handle error condition */
    }
    bufsize = 10000;
}
else {
    bufsize = symlink_max+1;
}

buf = (char *)malloc(bufsize);
if (buf == NULL) {
    /* handle error condition */
}

len = readlink("/usr/bin/perl", buf, bufsize);
buf[len] = '\0';

enum { BUFFERSIZE = 1024 };
char buf[BUFFERSIZE];
ssize_t len = readlink("/usr/bin/perl", buf, sizeof(buf)-1);

if (len != -1) {
    buf[len] = '\0';
}
else {
   /* handle error condition */
}