*** 3000test.c	2021-02-24 16:49:19.000000000 -0500
--- 3000test-dir-nommap.c	2025-03-16 23:04:18.701254629 -0400
***************
*** 13,18 ****
--- 13,20 ----
  #include <fcntl.h>
  #include <errno.h>
  #include <string.h>
+ #include <libgen.h>
+ #include <dirent.h>
  
  void report_error(char *error)
  {
***************
*** 23,32 ****
  
  int main(int argc, char *argv[])
  {
!         struct stat statbuf;
!         char *fn;
          int fd;
!         size_t len, i, count;
          
          char *data;
  
--- 25,33 ----
  
  int main(int argc, char *argv[])
  {
!         char *fn, fna[256];
          int fd;
!         size_t len, i, count, bytesread, bytestoread;
          
          char *data;
  
***************
*** 42,81 ****
  
          fn = argv[1];
  
!         if (stat(fn, &statbuf)) {
!                 report_error(strerror(errno));
!         }
! 
!         len = statbuf.st_size;
          printf("File %s: \n", fn);
!         printf("   inode %ld\n", statbuf.st_ino);
!         printf("  length %ld\n", len);        
  
!         if (S_ISREG(statbuf.st_mode)) {
                  fd = open(fn, O_RDONLY);
                  if (fd == -1) {
                          report_error(strerror(errno));
                  }
-                 data = (char *) mmap(NULL, len,
-                                      PROT_READ, MAP_SHARED, fd, 0);
-                 if (data == MAP_FAILED) {
-                         report_error(strerror(errno));
-                 }
  
                  count = 0;
!                 for (i=0; i<len; i++) {
                          if (data[i] == 'a') {
                                  count++;
                          }
                  }
  
                  printf(" a count %ld\n", count);
  
-                 if (munmap(data, len) == -1) {
-                         report_error(strerror(errno));                        
-                 }
                  close(fd);
          }
  
          return 0;
  }
--- 43,96 ----
  
          fn = argv[1];
  
! 	DIR *dir;
! 	struct dirent *e;
! 	realpath(fn, fna);
! 	dir = opendir(dirname(fna));
! 	if (dir == NULL) {
!     		fprintf(stderr, "ERROR: Couldn't open directory.\n");		
! 		return 1;
! 	}
! 
! 	for (e = readdir(dir); e != NULL; e = readdir(dir)) {
! 
! 		if (!strcmp(basename(fn), e->d_name)) {
! 			
! 		        
          printf("File %s: \n", fn);
!         printf("   inode %ld\n", e->d_fileno);
  
!         if (e->d_type == DT_REG) {
                  fd = open(fn, O_RDONLY);
                  if (fd == -1) {
                          report_error(strerror(errno));
                  }
  
                  count = 0;
!                 bytesread = bytestoread = 128*1024;
!                 while (bytesread == bytestoread) {
!                         data = malloc(bytestoread);
!                         bytesread = read(fd, data, bytestoread);
! 
!                 for (i=0; i<bytesread; i++) {
                          if (data[i] == 'a') {
                                  count++;
                          }
                  }
+                 if (data != NULL) free(data);
+                 }
  
                  printf(" a count %ld\n", count);
  
                  close(fd);
          }
+ 	break;
+ 	}
+ 	}
+ 
+ 	if (closedir(dir)) {
+                 fprintf(stderr, "ERROR: Couldn't close directory.\n");
+         }
  
          return 0;
  }