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
157 lines
4.6 KiB
C
157 lines
4.6 KiB
C
/* This file contains some utility routines for PM.
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*
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* The entry points are:
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* get_free_pid: get a free process or group id
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* find_param: look up a boot monitor parameter
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* find_proc: return process pointer from pid number
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* nice_to_priority convert nice level to priority queue
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* pm_isokendpt: check the validity of an endpoint
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* tell_vfs: send a request to VFS on behalf of a process
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* set_rusage_times: store user and system times in rusage structure
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*/
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#include "pm.h"
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#include <sys/resource.h>
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#include <sys/stat.h>
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#include <minix/callnr.h>
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#include <minix/com.h>
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#include <minix/endpoint.h>
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#include <fcntl.h>
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#include <signal.h> /* needed only because mproc.h needs it */
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#include "mproc.h"
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#include <minix/config.h>
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#include <minix/timers.h>
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#include <machine/archtypes.h>
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#include "kernel/const.h"
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#include "kernel/config.h"
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#include "kernel/type.h"
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#include "kernel/proc.h"
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/*===========================================================================*
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* get_free_pid *
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*===========================================================================*/
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pid_t get_free_pid()
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{
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static pid_t next_pid = INIT_PID + 1; /* next pid to be assigned */
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register struct mproc *rmp; /* check process table */
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int t; /* zero if pid still free */
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/* Find a free pid for the child and put it in the table. */
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do {
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t = 0;
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next_pid = (next_pid < NR_PIDS ? next_pid + 1 : INIT_PID + 1);
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for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++)
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if (rmp->mp_pid == next_pid || rmp->mp_procgrp == next_pid) {
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t = 1;
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break;
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}
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} while (t); /* 't' = 0 means pid free */
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return(next_pid);
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}
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/*===========================================================================*
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* find_param *
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*===========================================================================*/
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char *find_param(name)
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const char *name;
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{
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register const char *namep;
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register char *envp;
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for (envp = (char *) monitor_params; *envp != 0;) {
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for (namep = name; *namep != 0 && *namep == *envp; namep++, envp++)
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;
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if (*namep == '\0' && *envp == '=')
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return(envp + 1);
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while (*envp++ != 0)
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;
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}
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return(NULL);
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}
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/*===========================================================================*
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* find_proc *
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*===========================================================================*/
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struct mproc *find_proc(lpid)
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pid_t lpid;
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{
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register struct mproc *rmp;
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for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++)
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if ((rmp->mp_flags & IN_USE) && rmp->mp_pid == lpid)
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return(rmp);
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return(NULL);
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}
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/*===========================================================================*
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* nice_to_priority *
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*===========================================================================*/
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int nice_to_priority(int nice, unsigned* new_q)
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{
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if (nice < PRIO_MIN || nice > PRIO_MAX) return(EINVAL);
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*new_q = MAX_USER_Q + (nice-PRIO_MIN) * (MIN_USER_Q-MAX_USER_Q+1) /
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(PRIO_MAX-PRIO_MIN+1);
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/* Neither of these should ever happen. */
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if ((signed) *new_q < MAX_USER_Q) *new_q = MAX_USER_Q;
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if (*new_q > MIN_USER_Q) *new_q = MIN_USER_Q;
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return (OK);
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}
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/*===========================================================================*
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* pm_isokendpt *
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*===========================================================================*/
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int pm_isokendpt(int endpoint, int *proc)
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{
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*proc = _ENDPOINT_P(endpoint);
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if (*proc < 0 || *proc >= NR_PROCS)
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return EINVAL;
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if (endpoint != mproc[*proc].mp_endpoint)
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return EDEADEPT;
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if (!(mproc[*proc].mp_flags & IN_USE))
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return EDEADEPT;
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return OK;
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}
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/*===========================================================================*
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* tell_vfs *
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*===========================================================================*/
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void tell_vfs(rmp, m_ptr)
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struct mproc *rmp;
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message *m_ptr;
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{
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/* Send a request to VFS, without blocking.
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*/
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int r;
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if (rmp->mp_flags & VFS_CALL)
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panic("tell_vfs: not idle: %d", m_ptr->m_type);
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r = asynsend3(VFS_PROC_NR, m_ptr, AMF_NOREPLY);
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if (r != OK)
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panic("unable to send to VFS: %d", r);
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rmp->mp_flags |= VFS_CALL;
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}
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/*===========================================================================*
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* set_rusage_times *
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*===========================================================================*/
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void
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set_rusage_times(struct rusage * r_usage, clock_t user_time, clock_t sys_time)
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{
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u64_t usec;
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usec = user_time * 1000000 / sys_hz();
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r_usage->ru_utime.tv_sec = usec / 1000000;
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r_usage->ru_utime.tv_usec = usec % 1000000;
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usec = sys_time * 1000000 / sys_hz();
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r_usage->ru_stime.tv_sec = usec / 1000000;
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r_usage->ru_stime.tv_usec = usec % 1000000;
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}
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