Kodexempel F7

#include    <sys/types.h>
#include    <fcntl.h>
#include    "ourhdr.h"
int main(int argc, char *argv[])
{
    int accmode, val;

    if (argc != 2) ... /* fel */
    if ( (val = fcntl(atoi(argv[1]), F_GETFL, 0)) < 0) ... /* fel */

    accmode = val & O_ACCMODE;
    if      (accmode == O_RDONLY)   printf("read only");
    else if (accmode == O_WRONLY)   printf("write only");
    else if (accmode == O_RDWR)     printf("read write");
    else err_dump("unknown access mode");

    if (val & O_APPEND)         printf(", append");
    if (val & O_NONBLOCK)       printf(", nonblocking");
#if !defined(_POSIX_SOURCE) && defined(O_SYNC)
    if (val & O_SYNC)           printf(", synchronous writes");
#endif
    putchar('\n');
    exit(0);
}







/* En förenklad version av struct stat */

struct  stat {
  mode_t st_mode;     /* Filtyp/mode */
  ino_t st_ino;       /* I-nodsnummer */
  nlink_t st_nlink;   /* Antal länkar */
  uid_t st_uid;       /* Ägarens anv.-ID */
  gid_t st_gid;       /* Ägarens grupp-ID */
  off_t st_size;      /* Storlek i byte */
  time_t  st_atime;   /* Senast filen rördes */
  time_t  st_mtime;   /* Senaste ändring */
  time_t  st_ctime;   /* Senaste statusändring */
};