/[dynamips]/upstream/dynamips-0.2.6-RC3/utils.c
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Diff of /upstream/dynamips-0.2.6-RC3/utils.c

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upstream/dynamips-0.2.6-RC2/utils.c revision 3 by dpavlin, Sat Oct 6 16:05:34 2007 UTC upstream/dynamips-0.2.6-RC3/utils.c revision 4 by dpavlin, Sat Oct 6 16:06:49 2007 UTC
# Line 16  Line 16 
16  #include <sys/time.h>  #include <sys/time.h>
17  #include <sys/ioctl.h>  #include <sys/ioctl.h>
18  #include <sys/types.h>  #include <sys/types.h>
19    #include <sys/stat.h>
20  #include <sys/socket.h>  #include <sys/socket.h>
21  #include <arpa/inet.h>  #include <arpa/inet.h>
22  #include <netdb.h>  #include <netdb.h>
# Line 338  int m_fd_set_non_block(int fd) Line 339  int m_fd_set_non_block(int fd)
339    
340     return(fcntl(fd,F_SETFL, flags | O_NONBLOCK));     return(fcntl(fd,F_SETFL, flags | O_NONBLOCK));
341  }  }
342    
343    /* Map a memory zone from a file */
344    u_char *memzone_map_file(int fd,size_t len)
345    {
346       return(mmap(NULL,len,PROT_READ|PROT_WRITE,MAP_SHARED,fd,(off_t)0));
347    }
348    
349    /* Map a memory zone from a file, with copy-on-write (COW) */
350    u_char *memzone_map_cow_file(int fd,size_t len)
351    {
352       return(mmap(NULL,len,PROT_READ|PROT_WRITE,MAP_PRIVATE,fd,(off_t)0));
353    }
354    
355    /* Create a file to serve as a memory zone */
356    int memzone_create_file(char *filename,size_t len,u_char **ptr)
357    {
358       int fd;
359    
360       if ((fd = open(filename,O_CREAT|O_RDWR,S_IRWXU)) == -1) {
361          perror("memzone_create_file: open");
362          return(-1);
363       }
364    
365       if (ftruncate(fd,len) == -1) {
366          perror("memzone_create_file: ftruncate");
367          close(fd);
368          return(-1);
369       }
370    
371       *ptr = memzone_map_file(fd,len);
372    
373       if (!*ptr) {
374          close(fd);
375          fd = -1;
376       }
377    
378       return(fd);
379    }
380    
381    /* Open a file to serve as a COW memory zone */
382    int memzone_open_cow_file(char *filename,size_t len,u_char **ptr)
383    {
384       int fd;
385    
386       if ((fd = open(filename,O_RDWR,S_IRWXU)) == -1) {
387          perror("memzone_open_file: open");
388          return(-1);
389       }
390    
391       *ptr = memzone_map_cow_file(fd,len);
392    
393       if (!*ptr) {
394          close(fd);
395          fd = -1;
396       }
397    
398       return(fd);
399    }
400    
401    /* Open a file and map it in memory */
402    int memzone_open_file(char *filename,u_char **ptr,off_t *fsize)
403    {
404       struct stat fprop;
405       int fd;
406    
407       if ((fd = open(filename,O_RDWR,S_IRWXU)) == -1)
408          return(-1);
409    
410       if (fstat(fd,&fprop) == -1)
411          goto err_fstat;
412    
413       *fsize = fprop.st_size;
414       if (!(*ptr = memzone_map_file(fd,*fsize)))
415          goto err_mmap;
416      
417       return(fd);
418    
419     err_mmap:  
420     err_fstat:
421       close(fd);
422       return(-1);
423    }
424    
425    /* Compute NVRAM checksum */
426    m_uint16_t nvram_cksum(m_uint16_t *ptr,size_t count)
427    {
428       m_uint32_t sum = 0;
429    
430       while(count > 1) {
431          sum = sum + ntohs(*ptr);
432          ptr++;
433          count -= sizeof(m_uint16_t);
434       }
435    
436       if (count > 0)
437          sum = sum + ((ntohs(*ptr) & 0xFF) << 8);
438    
439       while(sum>>16)
440          sum = (sum & 0xffff) + (sum >> 16);
441    
442       return(~sum);
443    }
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