minix/servers/pm/mproc.h
Ben Gras 1e656b349d . processes stay ZOMBIE, even after wait(), to avoid wrongly seeing them
as living processes  before they are cleaned up (fixes
  wait()/waitpid() hanging forever on previously-ZOMBIE processes)

. stop processes from running using sys_nice() with PRIO_STOP
  when a handled signal is delivered, before computing 
  stack locations for sys_sigsend(). (fixes race condition
  when runnable processes get signals, and e.g. get scheduled
  before FS sends a reply to unpause(), which can make the
  signal stack location wrong.)
2006-10-25 11:29:43 +00:00

90 lines
4.2 KiB
C

/* This table has one slot per process. It contains all the process management
* information for each process. Among other things, it defines the text, data
* and stack segments, uids and gids, and various flags. The kernel and file
* systems have tables that are also indexed by process, with the contents
* of corresponding slots referring to the same process in all three.
*/
#include <timers.h>
EXTERN struct mproc {
struct mem_map mp_seg[NR_LOCAL_SEGS]; /* points to text, data, stack */
char mp_exitstatus; /* storage for status when process exits */
char mp_sigstatus; /* storage for signal # for killed procs */
pid_t mp_pid; /* process id */
endpoint_t mp_endpoint; /* kernel endpoint id */
pid_t mp_procgrp; /* pid of process group (used for signals) */
pid_t mp_wpid; /* pid this process is waiting for */
int mp_parent; /* index of parent process */
/* Child user and system times. Accounting done on child exit. */
clock_t mp_child_utime; /* cumulative user time of children */
clock_t mp_child_stime; /* cumulative sys time of children */
/* Real and effective uids and gids. */
uid_t mp_realuid; /* process' real uid */
uid_t mp_effuid; /* process' effective uid */
gid_t mp_realgid; /* process' real gid */
gid_t mp_effgid; /* process' effective gid */
/* File identification for sharing. */
ino_t mp_ino; /* inode number of file */
dev_t mp_dev; /* device number of file system */
time_t mp_ctime; /* inode changed time */
/* Signal handling information. */
sigset_t mp_ignore; /* 1 means ignore the signal, 0 means don't */
sigset_t mp_catch; /* 1 means catch the signal, 0 means don't */
sigset_t mp_sig2mess; /* 1 means transform into notify message */
sigset_t mp_sigmask; /* signals to be blocked */
sigset_t mp_sigmask2; /* saved copy of mp_sigmask */
sigset_t mp_sigpending; /* pending signals to be handled */
struct sigaction mp_sigact[_NSIG + 1]; /* as in sigaction(2) */
vir_bytes mp_sigreturn; /* address of C library __sigreturn function */
struct sigmsg mp_sigmsg; /* Save the details of the signal until the
* PM_UNPAUSE request is delivered.
*/
struct timer mp_timer; /* watchdog timer for alarm(2) */
/* Backwards compatibility for signals. */
sighandler_t mp_func; /* all sigs vectored to a single user fcn */
unsigned mp_flags; /* flag bits */
vir_bytes mp_procargs; /* ptr to proc's initial stack arguments */
struct mproc *mp_swapq; /* queue of procs waiting to be swapped in */
message mp_reply; /* reply message to be sent to one */
/* Communication with FS */
int mp_fs_call; /* Record the call for normal system calls */
int mp_fs_call2; /* Record the call for signals */
char *mp_exec_path; /* Path of executable */
vir_bytes mp_exec_path_len; /* Length of path (including nul) */
char *mp_exec_frame; /* Arguments */
vir_bytes mp_exec_frame_len; /* Length of arguments */
/* Scheduling priority. */
signed int mp_nice; /* nice is PRIO_MIN..PRIO_MAX, standard 0. */
char mp_name[PROC_NAME_LEN]; /* process name */
} mproc[NR_PROCS];
/* Flag values */
#define IN_USE 0x001 /* set when 'mproc' slot in use */
#define WAITING 0x002 /* set by WAIT system call */
#define ZOMBIE 0x004 /* set by EXIT, cleared by WAIT */
#define PAUSED 0x008 /* set by PAUSE system call */
#define ALARM_ON 0x010 /* set when SIGALRM timer started */
#define SEPARATE 0x020 /* set if file is separate I & D space */
#define TRACED 0x040 /* set if process is to be traced */
#define STOPPED 0x080 /* set if process stopped for tracing */
#define SIGSUSPENDED 0x100 /* set by SIGSUSPEND system call */
#define REPLY 0x200 /* set if a reply message is pending */
#define ONSWAP 0x400 /* set if data segment is swapped out */
#define SWAPIN 0x800 /* set if on the "swap this in" queue */
#define DONT_SWAP 0x1000 /* never swap out this process */
#define PRIV_PROC 0x2000 /* system process, special privileges */
#define PM_SIG_PENDING 0x4000 /* process got a signal while waiting for FS */
#define PARTIAL_EXEC 0x8000 /* Process got a new map but no content */
#define TOLD_PARENT 0x10000 /* Parent wait() completed, ZOMBIE off */
#define NIL_MPROC ((struct mproc *) 0)