From 14c65888e43ae67ab1fe42a3f98e1f8ec776dffa Mon Sep 17 00:00:00 2001
From: Ole Algoritme <ole@algoritme.io>
Date: Tue, 28 Feb 2023 11:30:50 +0100
Subject: [PATCH] upd with strerror

---
 gddr6.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/gddr6.c b/gddr6.c
index e42c813..282094f 100644
--- a/gddr6.c
+++ b/gddr6.c
@@ -8,6 +8,12 @@
 #include <sys/mman.h>
 #include <pci/pci.h>
 
+#define PRINT_ERROR                                                      \
+                do {                                                     \
+                fprintf(stderr, "Error at line %d, file %s (%d) [%s]\n", \
+                __LINE__, __FILE__, errno, strerror(errno)); exit(1);    \
+                } while(0)
+
 struct device 
 {
     uint32_t bar0;
@@ -77,10 +83,8 @@ int main(int argc, char **argv)
         base_offset = offset & ~(sysconf(_SC_PAGE_SIZE)-1);
         map_base = mmap(0, map_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, base_offset);
 
-        if (!map_base) {
-          printf("Can't map memory. Are you r00t?\n");
-          exit(-1);
-        }
+        if(map_base == (void *) -1) 
+          PRINT_ERROR;
 
         virt_addr = map_base + offset - base_offset;
         read_result = *((uint32_t *) virt_addr);