Archipelago » qemu

/*

 * os-posix.c

 *

 * Copyright (c) 2003-2008 Fabrice Bellard

 * Copyright (c) 2010 Red Hat, Inc.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include <unistd.h>

#include <fcntl.h>

#include <signal.h>

#include <sys/types.h>

#include <sys/wait.h>

#include <libgen.h>

/* Needed early for CONFIG_BSD etc. */

#include "config-host.h"

#include "sysemu.h"

void os_setup_early_signal_handling(void)

{

    struct sigaction act;

    sigfillset(&act.sa_mask);

    act.sa_flags = 0;

    act.sa_handler = SIG_IGN;

    sigaction(SIGPIPE, &act, NULL);

}

static void termsig_handler(int signal)

{

    qemu_system_shutdown_request();

}

static void sigchld_handler(int signal)

{

    waitpid(-1, NULL, WNOHANG);

}

void os_setup_signal_handling(void)

{

    struct sigaction act;

    memset(&act, 0, sizeof(act));

    act.sa_handler = termsig_handler;

    sigaction(SIGINT,  &act, NULL);

    sigaction(SIGHUP,  &act, NULL);

    sigaction(SIGTERM, &act, NULL);

    act.sa_handler = sigchld_handler;

    act.sa_flags = SA_NOCLDSTOP;

    sigaction(SIGCHLD, &act, NULL);

}

/* Find a likely location for support files using the location of the binary.

   For installed binaries this will be "$bindir/../share/qemu".  When

   running from the build tree this will be "$bindir/../pc-bios".  */

#define SHARE_SUFFIX "/share/qemu"

#define BUILD_SUFFIX "/pc-bios"

char *os_find_datadir(const char *argv0)

{

    char *dir;

    char *p = NULL;

    char *res;

    char buf[PATH_MAX];

    size_t max_len;

#if defined(__linux__)

    {

        int len;

        len = readlink("/proc/self/exe", buf, sizeof(buf) - 1);

        if (len > 0) {

            buf[len] = 0;

            p = buf;

        }

    }

#elif defined(__FreeBSD__)

    {

        static int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1};

        size_t len = sizeof(buf) - 1;

        *buf = '\0';

        if (!sysctl(mib, sizeof(mib)/sizeof(*mib), buf, &len, NULL, 0) &&

            *buf) {

            buf[sizeof(buf) - 1] = '\0';

            p = buf;

        }

    }

#endif

    /* If we don't have any way of figuring out the actual executable

       location then try argv[0].  */

    if (!p) {

        p = realpath(argv0, buf);

        if (!p) {

            return NULL;

        }

    }

    dir = dirname(p);

    dir = dirname(dir);

    max_len = strlen(dir) +

        MAX(strlen(SHARE_SUFFIX), strlen(BUILD_SUFFIX)) + 1;

    res = qemu_mallocz(max_len);

    snprintf(res, max_len, "%s%s", dir, SHARE_SUFFIX);

    if (access(res, R_OK)) {

        snprintf(res, max_len, "%s%s", dir, BUILD_SUFFIX);

        if (access(res, R_OK)) {

            qemu_free(res);

            res = NULL;

        }

    }

    return res;

}

#undef SHARE_SUFFIX

#undef BUILD_SUFFIX