b5e3e6d18c
. When drivers disappear that have pending select()s, wake up those user processes with EAGAIN so that they can retry their select() and won't hang forever on it. . When drivers re-appear and are mapped into the dmap, run through the list of mounted filesystems and re-dev_open() every one (for partition tables and such). This can't happen before the driver has exec()ced itself, so processes that have fork()ed but not exec()ced yet are marked as DMAP_BABY in the dmap table if they are dmapped before they are execced. If that happens, the above procedure happens after the exec(). If the exec() happens before the dmapping, it (the dev_open()ing) happens right away.
37 lines
1.9 KiB
C
37 lines
1.9 KiB
C
/* This is the per-process information. A slot is reserved for each potential
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* process. Thus NR_PROCS must be the same as in the kernel. It is not
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* possible or even necessary to tell when a slot is free here.
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*/
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EXTERN struct fproc {
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mode_t fp_umask; /* mask set by umask system call */
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struct inode *fp_workdir; /* pointer to working directory's inode */
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struct inode *fp_rootdir; /* pointer to current root dir (see chroot) */
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struct filp *fp_filp[OPEN_MAX];/* the file descriptor table */
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uid_t fp_realuid; /* real user id */
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uid_t fp_effuid; /* effective user id */
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gid_t fp_realgid; /* real group id */
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gid_t fp_effgid; /* effective group id */
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dev_t fp_tty; /* major/minor of controlling tty */
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int fp_fd; /* place to save fd if rd/wr can't finish */
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char *fp_buffer; /* place to save buffer if rd/wr can't finish*/
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int fp_nbytes; /* place to save bytes if rd/wr can't finish */
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int fp_cum_io_partial; /* partial byte count if rd/wr can't finish */
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char fp_suspended; /* set to indicate process hanging */
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char fp_revived; /* set to indicate process being revived */
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char fp_task; /* which task is proc suspended on */
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char fp_sesldr; /* true if proc is a session leader */
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char fp_execced; /* true if proc has exec()ced after fork */
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pid_t fp_pid; /* process id */
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long fp_cloexec; /* bit map for POSIX Table 6-2 FD_CLOEXEC */
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} fproc[NR_PROCS];
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/* Field values. */
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#define NOT_SUSPENDED 0 /* process is not suspended on pipe or task */
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#define SUSPENDED 1 /* process is suspended on pipe or task */
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#define NOT_REVIVING 0 /* process is not being revived */
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#define REVIVING 1 /* process is being revived from suspension */
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#define PID_FREE 0 /* process slot free */
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/* Check is process number is acceptable - includes system processes. */
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#define isokprocnr(n) ((unsigned)((n)+NR_TASKS) < NR_PROCS + NR_TASKS)
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