rubinius/rubinius

/* Based on setproctitle.c from Ruby (MRI). */

/* Based on setproctitle.c from openssh-5.6p1 */
/* Based on conf.c from UCB sendmail 8.8.8 */

/*
 * Copyright 2003 Damien Miller
 * Copyright (c) 1983, 1995-1997 Eric P. Allman
 * Copyright (c) 1988, 1993
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef HAVE_SETPROCTITLE

#include <stdlib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_PSTAT_H
#include <sys/pstat.h>
#endif
#include <string.h>
#include <stdarg.h>
#include <stdio.h>

#define SPT_NONE    0    /* don't use it at all */
#define SPT_PSTAT    1    /* use pstat(PSTAT_SETCMD, ...) */
#define SPT_REUSEARGV    2    /* cover argv with title information */

#ifdef HAVE_SPT_REUSEARGV
#define SPT_TYPE    SPT_REUSEARGV
#endif

#ifndef SPT_TYPE
# define SPT_TYPE    SPT_NONE
#endif

#if SPT_TYPE == SPT_REUSEARGV
static char *argv_start = NULL;
static size_t argv_env_len = 0;
static size_t argv_len = 0;
#endif

#endif /* HAVE_SETPROCTITLE */

void
ruby_init_setproctitle(int argc, char *argv[])
{
#if defined(SPT_TYPE) && SPT_TYPE == SPT_REUSEARGV
    extern char **environ;
    char *lastargv = NULL;
    char *lastenvp = NULL;
    char **envp = environ;
    int i;

    /*
     * NB: This assumes that argv has already been copied out of the
     * way. This is true for sshd, but may not be true for other
     * programs. Beware.
     */

    if (argc == 0 || argv[0] == NULL)
        return;

    /* Fail if we can't allocate room for the new environment */
    for (i = 0; envp[i] != NULL; i++)
        ;
    if ((environ = calloc(i + 1, sizeof(*environ))) == NULL) {
        environ = envp;    /* put it back */
        return;
    }

    /*
     * Find the last argv string or environment variable within
     * our process memory area.
     */
    for (i = 0; i < argc; i++) {
        if (lastargv == NULL || lastargv + 1 == argv[i])
            lastargv = argv[i] + strlen(argv[i]);
    }
    lastenvp = lastargv;
    for (i = 0; envp[i] != NULL; i++) {
        if (lastenvp + 1 == envp[i])
            lastenvp = envp[i] + strlen(envp[i]);
    }

    argv[1] = NULL;
    argv_start = argv[0];
    argv_len = lastargv - argv[0];
    argv_env_len = lastenvp - argv[0];

    for (i = 0; envp[i] != NULL; i++) {
    char *tmp;
    size_t len = strlen(envp[i]) + 1;

    tmp = malloc(len);
    if(!tmp) abort();
    memcpy(tmp, envp[i], len);

    environ[i] = tmp;
    }

    environ[i] = NULL;
#endif /* SPT_REUSEARGV */
}

#ifndef HAVE_SETPROCTITLE
void
setproctitle(const char *fmt, ...)
{
#if SPT_TYPE != SPT_NONE
    va_list ap;
    char ptitle[1024];
#if SPT_TYPE == SPT_PSTAT
    union pstun pst;
#endif

#if SPT_TYPE == SPT_REUSEARGV
    if (argv_env_len <= 0)
        return;
#endif

    va_start(ap, fmt);
    if (fmt != NULL) {
        vsnprintf(ptitle, sizeof(ptitle) , fmt, ap);
    }
    va_end(ap);

#if SPT_TYPE == SPT_PSTAT
    pst.pst_command = ptitle;
    pstat(PSTAT_SETCMD, pst, strlen(ptitle), 0, 0);
#elif SPT_TYPE == SPT_REUSEARGV
    strncpy(argv_start, ptitle, argv_env_len);
    argv_start[argv_env_len - 1] = '\0';
#endif

#endif /* SPT_NONE */
}

#endif /* HAVE_SETPROCTITLE */