suite/tests/client-interface/syscall-mod.c

/* **********************************************************
 * Copyright (c) 2008-2010 VMware, Inc.  All rights reserved.
 * **********************************************************/

/*
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 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
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 *   used to endorse or promote products derived from this software without
 *   specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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#include <stdio.h>
#include <syscall.h>

#define EXPANDSTR(x) #x
#define STRINGIFY(x) EXPANDSTR(x)

int main()
{
    int pid;
    fprintf(stderr, "starting\n");
    /* we don't want vsyscall since we rely on mov immed, eax being in same bb.
     * plus, libc getpid might cache the pid value.
     */
    asm("mov $" STRINGIFY(SYS_getpid) ", %eax");
#ifdef X64
    asm("syscall");
#else
    asm("int $0x80");
#endif
    asm("mov %%eax, %0" : "=m"(pid));
    fprintf(stderr, "pid = %d\n", pid);

    return 0;
}