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Annotation of prex-old/usr/lib/posix/process/waitpid.c, Revision 1.1

1.1     ! nbrk        1: /*
        !             2:  * Copyright (c) 2005, Kohsuke Ohtani
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. Neither the name of the author nor the names of any co-contributors
        !            14:  *    may be used to endorse or promote products derived from this software
        !            15:  *    without specific prior written permission.
        !            16:  *
        !            17:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
        !            18:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            19:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
        !            21:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            27:  * SUCH DAMAGE.
        !            28:  */
        !            29:
        !            30: #include <prex/prex.h>
        !            31: #include <prex/posix.h>
        !            32: #include <server/proc.h>
        !            33: #include <server/stdmsg.h>
        !            34: #include <sys/wait.h>
        !            35:
        !            36: #include <stddef.h>
        !            37: #include <errno.h>
        !            38:
        !            39: /*
        !            40:  * If the target child task calls exit() just after we
        !            41:  * send PS_WAITPID message, a process server will send an
        !            42:  * exception to us. But, we can not catch the exception
        !            43:  * before calling exception_wait().
        !            44:  */
        !            45: pid_t
        !            46: waitpid(pid_t pid, int *status, int options)
        !            47: {
        !            48:        struct msg m;
        !            49:        pid_t child;
        !            50:        int sig, err;
        !            51:        thread_t self;
        !            52:        int prio;
        !            53:
        !            54:        /* Boost current priority */
        !            55:        self = thread_self();
        !            56:        thread_getprio(self, &prio);
        !            57:        thread_setprio(self, prio - 1);
        !            58:
        !            59:        for (;;) {
        !            60:                m.hdr.code = PS_WAITPID;
        !            61:                m.data[0] = pid;
        !            62:                m.data[1] = options;
        !            63:                err = msg_send(__proc_obj, &m, sizeof(m));
        !            64:                if (err == EINTR)
        !            65:                        continue;
        !            66:
        !            67:                if (m.hdr.status) {
        !            68:                        errno = m.hdr.status;
        !            69:                        return -1;
        !            70:                }
        !            71:                child = m.data[0];
        !            72:                if (child != 0 || options & WNOHANG)
        !            73:                        break;
        !            74:
        !            75:                err = exception_wait(&sig);
        !            76:                if (err == EINTR) {
        !            77:                        errno = EINTR;
        !            78:                        break;
        !            79:                }
        !            80:        }
        !            81:        /* Restore priority */
        !            82:        thread_setprio(self, prio);
        !            83:
        !            84:        *status = m.data[1];
        !            85:        return child;
        !            86: }