FreeBSD/Linux Kernel Cross Reference
sys/servers/fs/fproc.h

     /* This is the per-process information.  A slot is reserved for each potential
      * process. Thus NR_PROCS must be the same as in the kernel. It is not 
      * possible or even necessary to tell when a slot is free here.
      */
     EXTERN struct fproc {
       mode_t fp_umask;              /* mask set by umask system call */
       struct inode *fp_workdir;     /* pointer to working directory's inode */
       struct inode *fp_rootdir;     /* pointer to current root dir (see chroot) */
       struct filp *fp_filp[OPEN_MAX];/* the file descriptor table */
      uid_t fp_realuid;             /* real user id */
      uid_t fp_effuid;              /* effective user id */
      gid_t fp_realgid;             /* real group id */
      gid_t fp_effgid;              /* effective group id */
      dev_t fp_tty;                 /* major/minor of controlling tty */
      int fp_fd;                    /* place to save fd if rd/wr can't finish */
      char *fp_buffer;              /* place to save buffer if rd/wr can't finish*/
      int  fp_nbytes;               /* place to save bytes if rd/wr can't finish */
      int  fp_cum_io_partial;       /* partial byte count if rd/wr can't finish */
      char fp_suspended;            /* set to indicate process hanging */
      char fp_revived;              /* set to indicate process being revived */
      char fp_task;                 /* which task is proc suspended on */
      char fp_sesldr;               /* true if proc is a session leader */
      char fp_execced;              /* true if proc has exec()ced after fork */
      pid_t fp_pid;                 /* process id */
      long fp_cloexec;              /* bit map for POSIX Table 6-2 FD_CLOEXEC */
    } fproc[NR_PROCS];
    
    /* Field values. */
    #define NOT_SUSPENDED      0    /* process is not suspended on pipe or task */
    #define SUSPENDED          1    /* process is suspended on pipe or task */
    #define NOT_REVIVING       0    /* process is not being revived */
    #define REVIVING           1    /* process is being revived from suspension */
    #define PID_FREE           0    /* process slot free */
    
    /* Check is process number is acceptable - includes system processes. */
    #define isokprocnr(n)   ((unsigned)((n)+NR_TASKS) < NR_PROCS + NR_TASKS)
    

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