29346ab043
This patch adds support for the wait4 system call, and with that the wait3 call as well. The implementation is absolutely minimal: only user and system times of the exited child are returned (with all other rusage fields left zero), and there is no support for tracers. Still, this should cover the main use cases of wait4. Change-Id: I7a04589a8423a23990ab39aa38e85d535556743a
99 lines
4.4 KiB
C
99 lines
4.4 KiB
C
/* This table has one slot per process. It contains all the process management
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* information for each process. Among other things, it defines the text, data
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* and stack segments, uids and gids, and various flags. The kernel and file
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* systems have tables that are also indexed by process, with the contents
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* of corresponding slots referring to the same process in all three.
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*/
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#include <limits.h>
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#include <minix/timers.h>
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#include <signal.h>
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#include <sys/cdefs.h>
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/* Needs to be included here, for 'ps' etc */
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#include "const.h"
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typedef struct sigaction ixfer_sigaction;
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EXTERN struct mproc {
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char mp_exitstatus; /* storage for status when process exits */
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char mp_sigstatus; /* storage for signal # for killed procs */
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pid_t mp_pid; /* process id */
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endpoint_t mp_endpoint; /* kernel endpoint id */
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pid_t mp_procgrp; /* pid of process group (used for signals) */
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pid_t mp_wpid; /* pid this process is waiting for */
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vir_bytes mp_waddr; /* struct rusage address while waiting */
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int mp_parent; /* index of parent process */
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int mp_tracer; /* index of tracer process, or NO_TRACER */
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/* Child user and system times. Accounting done on child exit. */
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clock_t mp_child_utime; /* cumulative user time of children */
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clock_t mp_child_stime; /* cumulative sys time of children */
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/* Real and effective uids and gids. */
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uid_t mp_realuid; /* process' real uid */
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uid_t mp_effuid; /* process' effective uid */
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gid_t mp_realgid; /* process' real gid */
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gid_t mp_effgid; /* process' effective gid */
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/* Supplemental groups. */
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int mp_ngroups; /* number of supplemental groups */
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gid_t mp_sgroups[NGROUPS_MAX];/* process' supplemental groups */
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/* Signal handling information. */
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sigset_t mp_ignore; /* 1 means ignore the signal, 0 means don't */
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sigset_t mp_catch; /* 1 means catch the signal, 0 means don't */
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sigset_t mp_sigmask; /* signals to be blocked */
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sigset_t mp_sigmask2; /* saved copy of mp_sigmask */
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sigset_t mp_sigpending; /* pending signals to be handled */
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sigset_t mp_ksigpending; /* bitmap for pending signals from the kernel */
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sigset_t mp_sigtrace; /* signals to hand to tracer first */
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ixfer_sigaction mp_sigact[_NSIG]; /* as in sigaction(2) */
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#ifdef __ACK__
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char mp_padding[60]; /* align structure with new libc */
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#endif
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vir_bytes mp_sigreturn; /* address of C library __sigreturn function */
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minix_timer_t mp_timer; /* watchdog timer for alarm(2), setitimer(2) */
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clock_t mp_interval[NR_ITIMERS]; /* setitimer(2) repetition intervals */
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unsigned mp_flags; /* flag bits */
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unsigned mp_trace_flags; /* trace options */
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message mp_reply; /* reply message to be sent to one */
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/* Process execution frame. Both fields are used by procfs. */
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vir_bytes mp_frame_addr; /* ptr to proc's initial stack arguments */
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size_t mp_frame_len; /* size of proc's initial stack arguments */
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/* Scheduling priority. */
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signed int mp_nice; /* nice is PRIO_MIN..PRIO_MAX, standard 0. */
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/* User space scheduling */
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endpoint_t mp_scheduler; /* scheduler endpoint id */
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char mp_name[PROC_NAME_LEN]; /* process name */
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int mp_magic; /* sanity check, MP_MAGIC */
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} mproc[NR_PROCS];
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/* Flag values */
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#define IN_USE 0x00001 /* set when 'mproc' slot in use */
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#define WAITING 0x00002 /* set by WAIT4 system call */
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#define ZOMBIE 0x00004 /* waiting for parent to issue WAIT4 call */
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#define PROC_STOPPED 0x00008 /* process is stopped in the kernel */
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#define ALARM_ON 0x00010 /* set when SIGALRM timer started */
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#define EXITING 0x00020 /* set by EXIT, process is now exiting */
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#define TOLD_PARENT 0x00040 /* parent wait() completed, ZOMBIE off */
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#define TRACE_STOPPED 0x00080 /* set if process stopped for tracing */
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#define SIGSUSPENDED 0x00100 /* set by SIGSUSPEND system call */
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#define VFS_CALL 0x00400 /* set if waiting for VFS (normal calls) */
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#define NEW_PARENT 0x00800 /* process's parent changed during VFS call */
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#define UNPAUSED 0x01000 /* VFS has replied to unpause request */
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#define PRIV_PROC 0x02000 /* system process, special privileges */
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#define PARTIAL_EXEC 0x04000 /* process got a new map but no content */
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#define TRACE_EXIT 0x08000 /* tracer is forcing this process to exit */
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#define TRACE_ZOMBIE 0x10000 /* waiting for tracer to issue WAIT4 call */
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#define DELAY_CALL 0x20000 /* waiting for call before sending signal */
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#define TAINTED 0x40000 /* process is 'tainted' */
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#define MP_MAGIC 0xC0FFEE0
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