This change refactors the process group implementation and adds support for sessions. The setsid(2) and getsid(2) system calls were added. psctl(2) now has PSCTL_TTYNAME, which lets you get the name of a process's terminal, and ps(1) now uses it. The initial terminal is now called /dev/tty1. /dev/tty is now a factory for the current terminal. A global lock now protects the process hierarchy which makes it safe to access other processes. This refactor removes potential vulnerabilities and increases system robustness. A number of terminal ioctls have been added. This is a compatible ABI change.
162 lines
4.3 KiB
C++
162 lines
4.3 KiB
C++
/*
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* Copyright (c) 2013, 2014, 2016 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* resource.cpp
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* Resource limits and operations.
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*/
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#include <sys/types.h>
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#include <errno.h>
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#include <limits.h>
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#include <sortix/resource.h>
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#include <sortix/kernel/copy.h>
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#include <sortix/kernel/kernel.h>
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#include <sortix/kernel/process.h>
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#include <sortix/kernel/ptable.h>
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#include <sortix/kernel/syscall.h>
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namespace Sortix {
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static int GetProcessPriority(pid_t who)
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{
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if ( who < 0 )
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return errno = EINVAL, -1;
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Process* process = who ? CurrentProcess()->GetPTable()->Get(who) : CurrentProcess();
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if ( !process )
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return errno = ESRCH, -1;
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ScopedLock lock(&process->nicelock);
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return process->nice;
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}
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static int SetProcessPriority(pid_t who, int prio)
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{
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if ( who < 0 )
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return errno = EINVAL, -1;
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Process* process = who ? CurrentProcess()->GetPTable()->Get(who) : CurrentProcess();
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if ( !process )
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return errno = ESRCH, -1;
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ScopedLock lock(&process->nicelock);
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process->nice = prio;
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return 0;
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}
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static Process* CurrentProcessGroup()
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{
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return CurrentProcess()->group;
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}
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static int GetProcessGroupPriority(pid_t who)
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{
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if ( who < 0 )
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return errno = EINVAL, -1;
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Process* group = who ? CurrentProcess()->GetPTable()->Get(who) : CurrentProcessGroup();
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if ( !group )
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return errno = ESRCH, -1;
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int lowest = INT_MAX;
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for ( Process* process = group->groupfirst; process; process = process->groupnext )
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{
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ScopedLock lock(&process->nicelock);
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if ( process->nice < lowest )
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lowest = process->nice;
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}
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return lowest;
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}
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static int SetProcessGroupPriority(pid_t who, int prio)
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{
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if ( who < 0 )
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return errno = EINVAL, -1;
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Process* group = who ? CurrentProcess()->GetPTable()->Get(who) : CurrentProcessGroup();
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if ( !group )
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return errno = ESRCH, -1;
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for ( Process* process = group->groupfirst; process; process = process->groupnext )
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{
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ScopedLock lock(&process->nicelock);
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process->nice = prio;
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}
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return 0;
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}
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static int GetUserPriority(uid_t /*who*/)
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{
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return errno = ENOSYS, -1;
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}
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static int SetUserPriority(uid_t /*who*/, int /*prio*/)
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{
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return errno = ENOSYS, -1;
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}
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int sys_getpriority(int which, id_t who)
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{
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ScopedLock lock(&process_family_lock);
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switch ( which )
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{
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case PRIO_PROCESS: return GetProcessPriority(who);
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case PRIO_PGRP: return GetProcessGroupPriority(who);
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case PRIO_USER: return GetUserPriority(who);
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default: return errno = EINVAL, -1;
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}
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}
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int sys_setpriority(int which, id_t who, int prio)
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{
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ScopedLock lock(&process_family_lock);
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switch ( which )
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{
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case PRIO_PROCESS: return SetProcessPriority(who, prio);
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case PRIO_PGRP: return SetProcessGroupPriority(who, prio);
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case PRIO_USER: return SetUserPriority(who, prio);
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default: return errno = EINVAL, -1;
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}
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}
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int sys_prlimit(pid_t pid,
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int resource,
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const struct rlimit* user_new_limit,
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struct rlimit* user_old_limit)
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{
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if ( pid < 0 )
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return errno = EINVAL, -1;
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if ( resource < 0 || RLIMIT_NUM_DECLARED <= resource )
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return errno = EINVAL, -1;
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ScopedLock family_lock(&process_family_lock);
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Process* process = pid ? CurrentProcess()->GetPTable()->Get(pid) : CurrentProcess();
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if ( !process )
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return errno = ESRCH, -1;
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ScopedLock lock(&process->resource_limits_lock);
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struct rlimit* limit = &process->resource_limits[resource];
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if ( user_old_limit )
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{
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if ( !CopyToUser(user_old_limit, limit, sizeof(struct rlimit)) )
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return -1;
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}
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if ( user_new_limit )
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{
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struct rlimit new_limit;
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if ( !CopyFromUser(&new_limit, user_new_limit, sizeof(struct rlimit)) )
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return -1;
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if ( new_limit.rlim_max < new_limit.rlim_cur )
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return errno = EINVAL, -1;
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*limit = new_limit;
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}
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return 0;
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}
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} // namespace Sortix
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