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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2011 New Dream Network
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#include "common/errno.h"
#ifndef _WIN32
#include <sstream>
#include <stdarg.h>
#include <sys/wait.h>
#include <unistd.h>
#include <vector>
#else
#include "common/SubProcess.h"
#endif /* _WIN32 */
using std::ostringstream;
#ifndef _WIN32
std::string run_cmd(const char *cmd, ...)
{
std::vector <const char *> arr;
va_list ap;
va_start(ap, cmd);
const char *c = cmd;
do {
arr.push_back(c);
c = va_arg(ap, const char*);
} while (c != NULL);
va_end(ap);
arr.push_back(NULL);
int fret = fork();
if (fret == -1) {
int err = errno;
ostringstream oss;
oss << "run_cmd(" << cmd << "): unable to fork(): " << cpp_strerror(err);
return oss.str();
}
else if (fret == 0) {
// execvp doesn't modify its arguments, so the const-cast here is safe.
close(STDIN_FILENO);
close(STDOUT_FILENO);
close(STDERR_FILENO);
execvp(cmd, (char * const*)&arr[0]);
_exit(127);
}
int status;
while (waitpid(fret, &status, 0) == -1) {
int err = errno;
if (err == EINTR)
continue;
ostringstream oss;
oss << "run_cmd(" << cmd << "): waitpid error: "
<< cpp_strerror(err);
return oss.str();
}
if (WIFEXITED(status)) {
int wexitstatus = WEXITSTATUS(status);
if (wexitstatus != 0) {
ostringstream oss;
oss << "run_cmd(" << cmd << "): exited with status " << wexitstatus;
return oss.str();
}
return "";
}
else if (WIFSIGNALED(status)) {
ostringstream oss;
oss << "run_cmd(" << cmd << "): terminated by signal";
return oss.str();
}
ostringstream oss;
oss << "run_cmd(" << cmd << "): terminated by unknown mechanism";
return oss.str();
}
#else
std::string run_cmd(const char *cmd, ...)
{
SubProcess p(cmd, SubProcess::CLOSE, SubProcess::PIPE, SubProcess::CLOSE);
va_list ap;
va_start(ap, cmd);
const char *c = cmd;
c = va_arg(ap, const char*);
while (c != NULL) {
p.add_cmd_arg(c);
c = va_arg(ap, const char*);
}
va_end(ap);
if (p.spawn() == 0) {
p.join();
}
return p.err();
}
#endif /* _WIN32 */
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