dc1238b7b9
if the process was REVIVING. (susp_count doesn't count those
processes.) this together with dev_io SELECT suspend side effect
for asynch. character devices solves the hanging pipe bug. or
at last vastly improves it.
added sanity checks, turned off by default.
made the {NOT_,}{SUSPENDING,REVIVING} constants weirder to
help sanity checking.
60 lines
2.4 KiB
C
60 lines
2.4 KiB
C
#include <sys/select.h>
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#include <minix/safecopies.h>
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/* 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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unsigned fp_flags;
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mode_t fp_umask; /* mask set by umask system call */
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struct vnode *fp_wd; /* working directory; NULL during reboot */
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struct vnode *fp_rd; /* root directory; NULL during reboot */
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struct filp *fp_filp[OPEN_MAX];/* the file descriptor table */
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fd_set fp_filp_inuse; /* which fd's are in use? */
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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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int fp_suspended; /* set to indicate process hanging */
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int fp_revived; /* set to indicate process being revived */
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int fp_task; /* which task is proc suspended on */
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endpoint_t fp_ioproc; /* proc no. in suspended-on i/o message */
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cp_grant_id_t fp_grant; /* revoke this grant on unsuspend if > -1 */
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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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fd_set fp_cloexec_set; /* bit map for POSIX Table 6-2 FD_CLOEXEC */
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endpoint_t fp_endpoint; /* kernel endpoint number of this process */
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} fproc[NR_PROCS];
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/* fp_flags */
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#define NO_FLAGS 0
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#define SUSP_REOPEN 1 /* Process is suspended until the reopens are
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* completed (after the restart of a driver).
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*/
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/* Field values. */
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/* fp_suspended is one of these. */
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#define NOT_SUSPENDED 0xC0FFEE /* process is not suspended on pipe or task */
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#define SUSPENDED 0xDEAD /* process is suspended on pipe or task */
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#define NOT_REVIVING 0xC0FFEEE /* process is not being revived */
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#define REVIVING 0xDEEAD /* 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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