+#define ERRNO_OFFSET(e) ((e) - __BPF_LOADER_ERRNO__START)
+#define ERRCODE_OFFSET(c) ERRNO_OFFSET(BPF_LOADER_ERRNO__##c)
+#define NR_ERRNO (__BPF_LOADER_ERRNO__END - __BPF_LOADER_ERRNO__START)
+
+static const char *bpf_loader_strerror_table[NR_ERRNO] = {
+ [ERRCODE_OFFSET(CONFIG)] = "Invalid config string",
+ [ERRCODE_OFFSET(GROUP)] = "Invalid group name",
+ [ERRCODE_OFFSET(EVENTNAME)] = "No event name found in config string",
+ [ERRCODE_OFFSET(INTERNAL)] = "BPF loader internal error",
+ [ERRCODE_OFFSET(COMPILE)] = "Error when compiling BPF scriptlet",
+};
+
+static int
+bpf_loader_strerror(int err, char *buf, size_t size)
+{
+ char sbuf[STRERR_BUFSIZE];
+ const char *msg;
+
+ if (!buf || !size)
+ return -1;
+
+ err = err > 0 ? err : -err;
+
+ if (err >= __LIBBPF_ERRNO__START)
+ return libbpf_strerror(err, buf, size);
+
+ if (err >= __BPF_LOADER_ERRNO__START && err < __BPF_LOADER_ERRNO__END) {
+ msg = bpf_loader_strerror_table[ERRNO_OFFSET(err)];
+ snprintf(buf, size, "%s", msg);
+ buf[size - 1] = '\0';
+ return 0;
+ }
+
+ if (err >= __BPF_LOADER_ERRNO__END)
+ snprintf(buf, size, "Unknown bpf loader error %d", err);
+ else
+ snprintf(buf, size, "%s",
+ strerror_r(err, sbuf, sizeof(sbuf)));
+
+ buf[size - 1] = '\0';
+ return -1;
+}
+