mirror of https://github.com/BOINC/boinc.git
130 lines
3.8 KiB
C
130 lines
3.8 KiB
C
// This file is part of BOINC.
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// http://boinc.berkeley.edu
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// Copyright (C) 2008 University of California
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//
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// BOINC is free software; you can redistribute it and/or modify it
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// under the terms of the GNU Lesser General Public License
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// as published by the Free Software Foundation,
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// either version 3 of the License, or (at your option) any later version.
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//
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// BOINC is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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// See the GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with BOINC. If not, see <http://www.gnu.org/licenses/>.
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#include "unix_util.h"
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#if 0
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#ifndef HAVE_SETENV
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#include <vector>
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#include <cstring>
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#include <cerrno>
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#include <cstdlib>
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static std::vector<char *> envstrings;
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// In theory setenv() is posix, but some implementations of unix
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// don't have it. The implementation isn't trivial because of
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// differences in how putenv() behaves on different systems.
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int setenv(const char *name, const char *value, int overwrite) {
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char *buf;
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int rv;
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// Name can't contant an equal sign.
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if (strchr(name,'=')) {
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errno=EINVAL;
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return -1;
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}
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// get any existing environment string.
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buf=getenv(name);
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if (!buf) {
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// no existing string, allocate a new one.
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buf=(char *)malloc(strlen(name)+strlen(value)+2);
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if (buf) envstrings.push_back(buf);
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} else {
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// we do have an existing string.
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// Are we allowed to overwrite it? If not return success.
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if (!overwrite) return 0;
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// is it long enough to hold our current string?
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if (strlen(buf)<(strlen(name)+strlen(value)+1)) {
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// no. See if we originally allocated this string.
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std::vector<char *>::iterator i=envstrings.begin();
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for (;i!=envstrings.end();i++) {
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if (*i == buf) break;
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}
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if (i!=envstrings.end()) {
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// we allocated this string. Reallocate it.
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buf=(char *)realloc(buf,strlen(name)+strlen(value)+2);
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*i=buf;
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} else {
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// someone else allocated the string. Allocate new memory.
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buf=(char *)malloc(strlen(name)+strlen(value)+2);
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if (buf) envstrings.push_back(buf);
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}
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}
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}
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if (!buf) {
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errno=ENOMEM;
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return -1;
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}
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sprintf(buf,"%s=%s",name,value);
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rv=putenv(buf);
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// Yes, there is a potential memory leak here. Some versions of operating
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// systems copy the string into the environment, others make the
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// existing string part of the environment. If we were to
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// implement unsetenv(), it might be possible to recover some of
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// this memory. But unsetenv() is even less trivial than setenv.
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return rv;
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}
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#endif /* !HAVE_SETENV */
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#endif
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#ifndef HAVE_DAEMON
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#include <cstdio>
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#include <cstdlib>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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using std::FILE;
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using std::freopen;
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static FILE *stderr_null, *stdout_null;
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int daemon(int nochdir, int noclose) {
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pid_t childpid,sessionid;
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if (!nochdir) {
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chdir("/");
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}
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if (!noclose) {
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stderr_null = freopen("/dev/null", "w", stderr);
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stdout_null = freopen("/dev/null", "w", stdout);
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}
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childpid = fork();
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if (childpid>0) {
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// Fork successful. We are the parent process.
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_exit(0);
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}
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if (childpid < 0) {
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// Fork unsuccessful. Return -1
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return -1;
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}
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// Fork successful, We are the child. Make us the lead process of a new
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// session.
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sessionid = setsid();
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if (sessionid <= 0) {
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// setsid() failed
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return -1;
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}
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// success
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return 0;
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}
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#endif /* !HAVE_DAEMON */
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