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Annotation of prex-old/usr/lib/posix/process/waitpid.c, Revision 1.1.1.1

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: }