/* Copyright (C) 2004 J.F.Dockes
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef TEST_EXECMD
#ifdef RECOLL_DATADIR
#include "autoconfig.h"
#else
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/select.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <fcntl.h>
#include <errno.h>
#include <signal.h>
#include <time.h>
#include <vector>
#include <string>
#ifdef HAVE_SPAWN_H
#ifndef __USE_GNU
#define __USE_GNU
#define undef__USE_GNU
#endif
#include <spawn.h>
#ifdef undef__USE_GNU
#undef __USE_GNU
#endif
#endif
#include "execmd.h"
#include "netcon.h"
#include "closefrom.h"
using namespace std;
extern char **environ;
bool ExecCmd::o_useVfork = false;
#ifdef RECOLL_DATADIR
#include "debuglog.h"
#include "smallut.h"
#else
// If compiling outside of recoll, make the file as standalone as reasonable.
#define LOGFATAL(X)
#define LOGERR(X)
#define LOGINFO(X)
#define LOGDEB(X)
#define LOGDEB0(X)
#define LOGDEB1(X)
#define LOGDEB2(X)
#define LOGDEB3(X)
#define LOGDEB4(X)
#ifndef MIN
#define MIN(A,B) ((A) < (B) ? (A) : (B))
#endif
static void stringToTokens(const string &s, vector<string> &tokens,
const string &delims = " \t", bool skipinit=true);
static void stringToTokens(const string& str, vector<string>& tokens,
const string& delims, bool skipinit)
{
string::size_type startPos = 0, pos;
// Skip initial delims, return empty if this eats all.
if (skipinit &&
(startPos = str.find_first_not_of(delims, 0)) == string::npos) {
return;
}
while (startPos < str.size()) {
// Find next delimiter or end of string (end of token)
pos = str.find_first_of(delims, startPos);
// Add token to the vector and adjust start
if (pos == string::npos) {
tokens.push_back(str.substr(startPos));
break;
} else if (pos == startPos) {
// Dont' push empty tokens after first
if (tokens.empty())
tokens.push_back(string());
startPos = ++pos;
} else {
tokens.push_back(str.substr(startPos, pos - startPos));
startPos = ++pos;
}
}
}
#endif // RECOLL_DATADIR
/* From FreeBSD's which command */
static bool exec_is_there(const char *candidate)
{
struct stat fin;
/* XXX work around access(2) false positives for superuser */
if (access(candidate, X_OK) == 0 &&
stat(candidate, &fin) == 0 &&
S_ISREG(fin.st_mode) &&
(getuid() != 0 ||
(fin.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) != 0)) {
return true;
}
return false;
}
bool ExecCmd::which(const string& cmd, string& exepath, const char* path)
{
if (cmd.empty())
return false;
if (cmd[0] == '/') {
if (exec_is_there(cmd.c_str())) {
exepath = cmd;
return true;
} else {
return false;
}
}
const char *pp;
if (path) {
pp = path;
} else {
pp = getenv("PATH");
}
if (pp == 0)
return false;
vector<string> pels;
stringToTokens(pp, pels, ":");
for (vector<string>::iterator it = pels.begin(); it != pels.end(); it++) {
if (it->empty())
*it = ".";
string candidate = (it->empty() ? string(".") : *it) + "/" + cmd;
if (exec_is_there(candidate.c_str())) {
exepath = candidate;
return true;
}
}
return false;
}
void ExecCmd::useVfork(bool on)
{
// Just in case: there are competent people who believe that the
// dynamic linker can sometimes deadlock if execve() is resolved
// inside the vfork/exec window. Make sure it's done now. If "/" is
// an executable file, we have a problem.
const char *argv[] = {"/", 0};
execve("/", (char *const *)argv, environ);
o_useVfork = on;
}
void ExecCmd::putenv(const string &ea)
{
m_env.push_back(ea);
}
void ExecCmd::putenv(const string &name, const string& value)
{
string ea = name + "=" + value;
putenv(ea);
}
static void msleep(int millis)
{
struct timespec spec;
spec.tv_sec = millis / 1000;
spec.tv_nsec = (millis % 1000) * 1000000;
nanosleep(&spec, 0);
}
/** A resource manager to ensure that execcmd cleans up if an exception is
* raised in the callback, or at different places on errors occurring
* during method executions */
class ExecCmdRsrc {
public:
ExecCmdRsrc(ExecCmd *parent) : m_parent(parent), m_active(true) {}
void inactivate() {m_active = false;}
~ExecCmdRsrc() {
if (!m_active || !m_parent)
return;
LOGDEB1(("~ExecCmdRsrc: working. mypid: %d\n", (int)getpid()));
// Better to close the descs first in case the child is waiting in read
if (m_parent->m_pipein[0] >= 0)
close(m_parent->m_pipein[0]);
if (m_parent->m_pipein[1] >= 0)
close(m_parent->m_pipein[1]);
if (m_parent->m_pipeout[0] >= 0)
close(m_parent->m_pipeout[0]);
if (m_parent->m_pipeout[1] >= 0)
close(m_parent->m_pipeout[1]);
// It's apparently possible for m_pid to be > 0 and getpgid to fail. In
// this case, we have to conclude that the child process does
// not exist. Not too sure what causes this, but the previous code
// definitely tried to call killpg(-1,) from time to time.
pid_t grp;
if (m_parent->m_pid > 0 && (grp = getpgid(m_parent->m_pid)) > 0) {
LOGDEB(("ExecCmd: killpg(%d, SIGTERM)\n", grp));
int ret = killpg(grp, SIGTERM);
if (ret == 0) {
for (int i = 0; i < 3; i++) {
msleep(i == 0 ? 5 : (i == 1 ? 100 : 2000));
int status;
(void)waitpid(m_parent->m_pid, &status, WNOHANG);
if (kill(m_parent->m_pid, 0) != 0)
break;
if (i == 2) {
LOGDEB(("ExecCmd: killpg(%d, SIGKILL)\n", grp));
killpg(grp, SIGKILL);
(void)waitpid(m_parent->m_pid, &status, WNOHANG);
}
}
} else {
LOGERR(("ExecCmd: error killing process group %d: %d\n",
grp, errno));
}
}
m_parent->m_tocmd.reset();
m_parent->m_fromcmd.reset();
pthread_sigmask(SIG_UNBLOCK, &m_parent->m_blkcld, 0);
m_parent->reset();
}
private:
ExecCmd *m_parent;
bool m_active;
};
ExecCmd::~ExecCmd()
{
ExecCmdRsrc(this);
}
// In child process. Set up pipes and exec command.
// This must not return. _exit() on error.
// *** This can be called after a vfork, so no modification of the
// process memory at all is allowed ***
// The LOGXX calls should not be there, but they occur only after "impossible"
// errors, which we would most definitely want to have a hint about.
//
// Note that any of the LOGXX calls could block on a mutex set in the
// father process, so that only absolutely exceptional conditions,
// should be logged, for debugging and post-mortem purposes
// If one of the calls block, the problem manifests itself by 20mn
// (filter timeout) of looping on "ExecCmd::doexec: selectloop
// returned 1', because the father is waiting on the read descriptor
inline void ExecCmd::dochild(const string &cmd, const char **argv,
const char **envv,
bool has_input, bool has_output)
{
// Start our own process group
if (setpgid(0, getpid())) {
LOGINFO(("ExecCmd::DOCHILD: setpgid(0, %d) failed: errno %d\n",
getpid(), errno));
}
// Restore SIGTERM to default. Really, signal handling should be
// specified when creating the execmd, there might be other
// signals to reset. Resetting SIGTERM helps Recoll get rid of its
// filter children for now though. To be fixed one day...
// Note that resetting to SIG_DFL is a portable use of
// signal(). No need for sigaction() here.
// There is supposedely a risk of problems if another thread was
// calling a signal-affecting function when vfork was called. This
// seems acceptable though as no self-respecting thread is going
// to mess with the global process signal disposition.
if (signal(SIGTERM, SIG_DFL) == SIG_ERR) {
//LOGERR(("ExecCmd::DOCHILD: signal() failed, errno %d\n", errno));
}
sigset_t sset;
sigfillset(&sset);
pthread_sigmask(SIG_UNBLOCK, &sset, 0);
sigprocmask(SIG_UNBLOCK, &sset, 0);
#ifdef HAVE_SETRLIMIT
#if defined RLIMIT_AS || defined RLIMIT_VMEM || defined RLIMIT_DATA
if (m_rlimit_as_mbytes > 2000 && sizeof(rlim_t) < 8) {
// Impossible limit, don't use it
m_rlimit_as_mbytes = 0;
}
if (m_rlimit_as_mbytes > 0) {
struct rlimit ram_limit = {
static_cast<rlim_t>(m_rlimit_as_mbytes * 1024 * 1024),
RLIM_INFINITY
};
int resource;
// RLIMIT_AS and RLIMIT_VMEM are usually synonyms when VMEM is
// defined. RLIMIT_AS is Posix. Both don't really do what we
// want, because they count e.g. shared lib mappings, which we
// don't really care about.
// RLIMIT_DATA only limits the data segment. Modern mallocs
// use mmap and will not be bound. (Otoh if we only have this,
// we're probably not modern).
// So we're unsatisfied either way.
#ifdef RLIMIT_AS
resource = RLIMIT_AS;
#elif defined RLIMIT_VMEM
resource = RLIMIT_VMEM;
#else
resource = RLIMIT_DATA;
#endif
setrlimit(resource, &ram_limit);
}
#endif
#endif // have_setrlimit
if (has_input) {
close(m_pipein[1]);
if (m_pipein[0] != 0) {
dup2(m_pipein[0], 0);
close(m_pipein[0]);
}
}
if (has_output) {
close(m_pipeout[0]);
if (m_pipeout[1] != 1) {
if (dup2(m_pipeout[1], 1) < 0) {
LOGERR(("ExecCmd::DOCHILD: dup2() failed. errno %d\n", errno));
}
if (close(m_pipeout[1]) < 0) {
LOGERR(("ExecCmd::DOCHILD: close() failed. errno %d\n", errno));
}
}
}
// Do we need to redirect stderr ?
if (!m_stderrFile.empty()) {
int fd = open(m_stderrFile.c_str(), O_WRONLY|O_CREAT
#ifdef O_APPEND
|O_APPEND
#endif
, 0600);
if (fd < 0) {
close(2);
} else {
if (fd != 2) {
dup2(fd, 2);
}
lseek(2, 0, 2);
}
}
// Close all descriptors except 0,1,2
libclf_closefrom(3);
execve(cmd.c_str(), (char *const*)argv, (char *const*)envv);
// Hu ho. This should never have happened as we checked the
// existence of the executable before calling dochild... Until we
// did this check, this was the chief cause of LOG mutex deadlock
LOGERR(("ExecCmd::DOCHILD: execve(%s) failed. errno %d\n", cmd.c_str(),
errno));
_exit(127);
}
void ExecCmd::setrlimit_as(int mbytes)
{
m_rlimit_as_mbytes = mbytes;
}
int ExecCmd::startExec(const string &cmd, const vector<string>& args,
bool has_input, bool has_output)
{
{ // Debug and logging
string command = cmd + " ";
for (vector<string>::const_iterator it = args.begin();
it != args.end(); it++) {
command += "{" + *it + "} ";
}
LOGDEB(("ExecCmd::startExec: (%d|%d) %s\n",
has_input, has_output, command.c_str()));
}
// The resource manager ensures resources are freed if we return early
ExecCmdRsrc e(this);
if (has_input && pipe(m_pipein) < 0) {
LOGERR(("ExecCmd::startExec: pipe(2) failed. errno %d\n", errno));
return -1;
}
if (has_output && pipe(m_pipeout) < 0) {
LOGERR(("ExecCmd::startExec: pipe(2) failed. errno %d\n", errno));
return -1;
}
//////////// vfork setup section
// We do here things that we could/should do after a fork(), but
// not a vfork(). Does no harm to do it here in both cases, except
// that it needs cleanup (as compared to doing it just before
// exec()).
// Allocate arg vector (2 more for arg0 + final 0)
typedef const char *Ccharp;
Ccharp *argv;
argv = (Ccharp *)malloc((args.size()+2) * sizeof(char *));
if (argv == 0) {
LOGERR(("ExecCmd::doexec: malloc() failed. errno %d\n", errno));
return -1;
}
// Fill up argv
argv[0] = cmd.c_str();
int i = 1;
vector<string>::const_iterator it;
for (it = args.begin(); it != args.end(); it++) {
argv[i++] = it->c_str();
}
argv[i] = 0;
Ccharp *envv;
int envsize;
for (envsize = 0; ; envsize++)
if (environ[envsize] == 0)
break;
envv = (Ccharp *)malloc((envsize + m_env.size() + 2) * sizeof(char *));
if (envv == 0) {
LOGERR(("ExecCmd::doexec: malloc() failed. errno %d\n", errno));
free(argv);
return -1;
}
int eidx;
for (eidx = 0; eidx < envsize; eidx++)
envv[eidx] = environ[eidx];
for (vector<string>::const_iterator it = m_env.begin();
it != m_env.end(); it++) {
envv[eidx++] = it->c_str();
}
envv[eidx] = 0;
// As we are going to use execve, not execvp, do the PATH thing.
string exe;
if (!which(cmd, exe)) {
LOGERR(("ExecCmd::startExec: %s not found\n", cmd.c_str()));
free(argv);
free(envv);
return -1;
}
//////////////////////////////// End vfork child prepare section.
#if HAVE_POSIX_SPAWN && USE_POSIX_SPAWN
// Note that posix_spawn provides no way to setrlimit() the child.
{
posix_spawnattr_t attrs;
posix_spawnattr_init (&attrs);
short flags;
posix_spawnattr_getflags(&attrs, &flags);
flags |= POSIX_SPAWN_USEVFORK;
posix_spawnattr_setpgroup(&attrs, 0);
flags |= POSIX_SPAWN_SETPGROUP;
sigset_t sset;
sigemptyset(&sset);
posix_spawnattr_setsigmask (&attrs, &sset);
flags |= POSIX_SPAWN_SETSIGMASK;
sigemptyset(&sset);
sigaddset(&sset, SIGTERM);
posix_spawnattr_setsigdefault(&attrs, &sset);
flags |= POSIX_SPAWN_SETSIGDEF;
posix_spawnattr_setflags(&attrs, flags);
posix_spawn_file_actions_t facts;
posix_spawn_file_actions_init(&facts);
if (has_input) {
posix_spawn_file_actions_addclose(&facts, m_pipein[1]);
if (m_pipein[0] != 0) {
posix_spawn_file_actions_adddup2(&facts, m_pipein[0], 0);
posix_spawn_file_actions_addclose(&facts, m_pipein[0]);
}
}
if (has_output) {
posix_spawn_file_actions_addclose(&facts, m_pipeout[0]);
if (m_pipeout[1] != 1) {
posix_spawn_file_actions_adddup2(&facts, m_pipeout[1], 1);
posix_spawn_file_actions_addclose(&facts, m_pipeout[1]);
}
}
// Do we need to redirect stderr ?
if (!m_stderrFile.empty()) {
int oflags = O_WRONLY|O_CREAT;
#ifdef O_APPEND
oflags |= O_APPEND;
#endif
posix_spawn_file_actions_addopen(&facts, 2, m_stderrFile.c_str(),
oflags, 0600);
}
LOGDEB1(("using SPAWN\n"));
// posix_spawn() does not have any standard way to ask for
// calling closefrom(). Afaik there is a solaris extension for this,
// but let's just add all fds
for (int i = 3; i < libclf_maxfd(); i++) {
posix_spawn_file_actions_addclose(&facts, i);
}
int ret = posix_spawn(&m_pid, exe.c_str(), &facts, &attrs,
(char *const *)argv, (char *const *)envv);
posix_spawnattr_destroy(&attrs);
posix_spawn_file_actions_destroy(&facts);
if (ret) {
LOGERR(("ExecCmd::startExec: posix_spawn() failed. errno %d\n",
ret));
return -1;
}
}
#else
if (o_useVfork) {
LOGDEB1(("using VFORK\n"));
m_pid = vfork();
} else {
LOGDEB1(("using FORK\n"));
m_pid = fork();
}
if (m_pid < 0) {
LOGERR(("ExecCmd::startExec: fork(2) failed. errno %d\n", errno));
return -1;
}
if (m_pid == 0) {
// e.inactivate() is not needed. As we do not return, the call
// stack won't be unwound and destructors of local objects
// won't be called.
dochild(exe, argv, envv, has_input, has_output);
// dochild does not return. Just in case...
_exit(1);
}
#endif
// Father process
////////////////////
// Vfork cleanup section
free(argv);
free(envv);
///////////////////
// Set the process group for the child. This is also done in the
// child process see wikipedia(Process_group)
if (setpgid(m_pid, m_pid)) {
// This can fail with EACCES if the son has already done execve
// (linux at least)
LOGDEB2(("ExecCmd: father setpgid(son)(%d,%d) errno %d (ok)\n",
m_pid, m_pid, errno));
}
sigemptyset(&m_blkcld);
sigaddset(&m_blkcld, SIGCHLD);
pthread_sigmask(SIG_BLOCK, &m_blkcld, 0);
if (has_input) {
close(m_pipein[0]);
m_pipein[0] = -1;
NetconCli *iclicon = new NetconCli();
iclicon->setconn(m_pipein[1]);
m_tocmd = NetconP(iclicon);
}
if (has_output) {
close(m_pipeout[1]);
m_pipeout[1] = -1;
NetconCli *oclicon = new NetconCli();
oclicon->setconn(m_pipeout[0]);
m_fromcmd = NetconP(oclicon);
}
/* Don't want to undo what we just did ! */
e.inactivate();
return 0;
}
// Netcon callback. Send data to the command's input
class ExecWriter : public NetconWorker {
public:
ExecWriter(const string *input, ExecCmdProvide *provide)
: m_input(input), m_cnt(0), m_provide(provide)
{}
virtual int data(NetconData *con, Netcon::Event reason)
{
if (!m_input) return -1;
LOGDEB1(("ExecWriter: input m_cnt %d input length %d\n", m_cnt,
m_input->length()));
if (m_cnt >= m_input->length()) {
// Fd ready for more but we got none.
if (m_provide) {
m_provide->newData();
if (m_input->empty()) {
return 0;
} else {
m_cnt = 0;
}
LOGDEB2(("ExecWriter: provide m_cnt %d input length %d\n",
m_cnt, m_input->length()));
} else {
return 0;
}
}
int ret = con->send(m_input->c_str() + m_cnt,
m_input->length() - m_cnt);
LOGDEB2(("ExecWriter: wrote %d to command\n", ret));
if (ret <= 0) {
LOGERR(("ExecWriter: data: can't write\n"));
return -1;
}
m_cnt += ret;
return ret;
}
private:
const string *m_input;
unsigned int m_cnt; // Current offset inside m_input
ExecCmdProvide *m_provide;
};
// Netcon callback. Get data from the command output.
class ExecReader : public NetconWorker {
public:
ExecReader(string *output, ExecCmdAdvise *advise)
: m_output(output), m_advise(advise)
{}
virtual int data(NetconData *con, Netcon::Event reason)
{
char buf[8192];
int n = con->receive(buf, 8192);
LOGDEB1(("ExecReader: got %d from command\n", n));
if (n < 0) {
LOGERR(("ExecCmd::doexec: receive failed. errno %d\n", errno));
} else if (n > 0) {
m_output->append(buf, n);
if (m_advise)
m_advise->newData(n);
} // else n == 0, just return
return n;
}
private:
string *m_output;
ExecCmdAdvise *m_advise;
};
int ExecCmd::doexec(const string &cmd, const vector<string>& args,
const string *input, string *output)
{
if (startExec(cmd, args, input != 0, output != 0) < 0) {
return -1;
}
// Cleanup in case we return early
ExecCmdRsrc e(this);
SelectLoop myloop;
int ret = 0;
if (input || output) {
// Setup output
if (output) {
NetconCli *oclicon = dynamic_cast<NetconCli *>(m_fromcmd.get());
if (!oclicon) {
LOGERR(("ExecCmd::doexec: no connection from command\n"));
return -1;
}
oclicon->setcallback(STD_SHARED_PTR<NetconWorker>
(new ExecReader(output, m_advise)));
myloop.addselcon(m_fromcmd, Netcon::NETCONPOLL_READ);
// Give up ownership
m_fromcmd.reset();
}
// Setup input
if (input) {
NetconCli *iclicon = dynamic_cast<NetconCli *>(m_tocmd.get());
if (!iclicon) {
LOGERR(("ExecCmd::doexec: no connection from command\n"));
return -1;
}
iclicon->setcallback(STD_SHARED_PTR<NetconWorker>
(new ExecWriter(input, m_provide)));
myloop.addselcon(m_tocmd, Netcon::NETCONPOLL_WRITE);
// Give up ownership
m_tocmd.reset();
}
// Do the actual reading/writing/waiting
myloop.setperiodichandler(0, 0, m_timeoutMs);
while ((ret = myloop.doLoop()) > 0) {
LOGDEB(("ExecCmd::doexec: selectloop returned %d\n", ret));
if (m_advise)
m_advise->newData(0);
if (m_killRequest) {
LOGINFO(("ExecCmd::doexec: cancel request\n"));
break;
}
}
LOGDEB0(("ExecCmd::doexec: selectloop returned %d\n", ret));
// Check for interrupt request: we won't want to waitpid()
if (m_advise)
m_advise->newData(0);
// The netcons don't take ownership of the fds: we have to close them
// (have to do it before wait, this may be the signal the child is
// waiting for exiting).
if (input) {
close(m_pipein[1]);
m_pipein[1] = -1;
}
if (output) {
close(m_pipeout[0]);
m_pipeout[0] = -1;
}
}
// Normal return: deactivate cleaner, wait() will do the cleanup
e.inactivate();
int ret1 = ExecCmd::wait();
if (ret)
return -1;
return ret1;
}
int ExecCmd::send(const string& data)
{
NetconCli *con = dynamic_cast<NetconCli *>(m_tocmd.get());
if (con == 0) {
LOGERR(("ExecCmd::send: outpipe is closed\n"));
return -1;
}
unsigned int nwritten = 0;
while (nwritten < data.length()) {
if (m_killRequest)
break;
int n = con->send(data.c_str() + nwritten, data.length() - nwritten);
if (n < 0) {
LOGERR(("ExecCmd::send: send failed\n"));
return -1;
}
nwritten += n;
}
return nwritten;
}
int ExecCmd::receive(string& data, int cnt)
{
NetconCli *con = dynamic_cast<NetconCli *>(m_fromcmd.get());
if (con == 0) {
LOGERR(("ExecCmd::receive: inpipe is closed\n"));
return -1;
}
const int BS = 4096;
char buf[BS];
int ntot = 0;
do {
int toread = cnt > 0 ? MIN(cnt - ntot, BS) : BS;
int n = con->receive(buf, toread);
if (n < 0) {
LOGERR(("ExecCmd::receive: error\n"));
return -1;
} else if (n > 0) {
ntot += n;
data.append(buf, n);
} else {
LOGDEB(("ExecCmd::receive: got 0\n"));
break;
}
} while (cnt > 0 && ntot < cnt);
return ntot;
}
int ExecCmd::getline(string& data)
{
NetconCli *con = dynamic_cast<NetconCli *>(m_fromcmd.get());
if (con == 0) {
LOGERR(("ExecCmd::receive: inpipe is closed\n"));
return -1;
}
const int BS = 1024;
char buf[BS];
int n = con->getline(buf, BS);
if (n < 0) {
LOGERR(("ExecCmd::getline: error\n"));
} else if (n > 0) {
data.append(buf, n);
} else {
LOGDEB(("ExecCmd::getline: got 0\n"));
}
return n;
}
// Wait for command status and clean up all resources.
int ExecCmd::wait()
{
ExecCmdRsrc e(this);
int status = -1;
if (!m_killRequest && m_pid > 0) {
if (waitpid(m_pid, &status, 0) < 0) {
LOGERR(("ExecCmd::waitpid: returned -1 errno %d\n", errno));
status = -1;
}
LOGDEB(("ExecCmd::wait: got status 0x%x\n", status));
m_pid = -1;
}
// Let the ExecCmdRsrc cleanup
return status;
}
bool ExecCmd::maybereap(int *status)
{
ExecCmdRsrc e(this);
*status = -1;
if (m_pid <= 0) {
// Already waited for ??
return true;
}
pid_t pid = waitpid(m_pid, status, WNOHANG);
if (pid < 0) {
LOGERR(("ExecCmd::maybereap: returned -1 errno %d\n", errno));
m_pid = -1;
return true;
} else if (pid == 0) {
LOGDEB1(("ExecCmd::maybereap: not exited yet\n"));
e.inactivate();
return false;
} else {
LOGDEB(("ExecCmd::maybereap: got status 0x%x\n", status));
m_pid = -1;
return true;
}
}
// Static
bool ExecCmd::backtick(const vector<string> cmd, string& out)
{
vector<string>::const_iterator it = cmd.begin();
it++;
vector<string> args(it, cmd.end());
ExecCmd mexec;
int status = mexec.doexec(*cmd.begin(), args, 0, &out);
return status == 0;
}
/// ReExec class methods ///////////////////////////////////////////////////
ReExec::ReExec(int argc, char *args[])
{
init(argc, args);
}
void ReExec::init(int argc, char *args[])
{
for (int i = 0; i < argc; i++) {
m_argv.push_back(args[i]);
}
m_cfd = open(".", 0);
char *cd = getcwd(0, 0);
if (cd)
m_curdir = cd;
free(cd);
}
void ReExec::insertArgs(const vector<string>& args, int idx)
{
vector<string>::iterator it, cit;
unsigned int cmpoffset = (unsigned int)-1;
if (idx == -1 || string::size_type(idx) >= m_argv.size()) {
it = m_argv.end();
if (m_argv.size() >= args.size()) {
cmpoffset = m_argv.size() - args.size();
}
} else {
it = m_argv.begin() + idx;
if (idx + args.size() <= m_argv.size()) {
cmpoffset = idx;
}
}
// Check that the option is not already there
if (cmpoffset != (unsigned int)-1) {
bool allsame = true;
for (unsigned int i = 0; i < args.size(); i++) {
if (m_argv[cmpoffset + i] != args[i]) {
allsame = false;
break;
}
}
if (allsame)
return;
}
m_argv.insert(it, args.begin(), args.end());
}
void ReExec::removeArg(const string& arg)
{
for (vector<string>::iterator it = m_argv.begin();
it != m_argv.end(); it++) {
if (*it == arg)
it = m_argv.erase(it);
}
}
// Reexecute myself, as close as possible to the initial exec
void ReExec::reexec()
{
#if 0
char *cwd;
cwd = getcwd(0,0);
FILE *fp = stdout; //fopen("/tmp/exectrace", "w");
if (fp) {
fprintf(fp, "reexec: pwd: [%s] args: ", cwd?cwd:"getcwd failed");
for (vector<string>::const_iterator it = m_argv.begin();
it != m_argv.end(); it++) {
fprintf(fp, "[%s] ", it->c_str());
}
fprintf(fp, "\n");
}
#endif
// Execute the atexit funcs
while (!m_atexitfuncs.empty()) {
(m_atexitfuncs.top())();
m_atexitfuncs.pop();
}
// Try to get back to the initial working directory
if (m_cfd < 0 || fchdir(m_cfd) < 0) {
LOGINFO(("ReExec::reexec: fchdir failed, trying chdir\n"));
if (!m_curdir.empty() && chdir(m_curdir.c_str())) {
LOGERR(("ReExec::reexec: chdir failed\n"));
}
}
// Close all descriptors except 0,1,2
libclf_closefrom(3);
// Allocate arg vector (1 more for final 0)
typedef const char *Ccharp;
Ccharp *argv;
argv = (Ccharp *)malloc((m_argv.size()+1) * sizeof(char *));
if (argv == 0) {
LOGERR(("ExecCmd::doexec: malloc() failed. errno %d\n", errno));
return;
}
// Fill up argv
int i = 0;
vector<string>::const_iterator it;
for (it = m_argv.begin(); it != m_argv.end(); it++) {
argv[i++] = it->c_str();
}
argv[i] = 0;
execvp(m_argv[0].c_str(), (char *const*)argv);
}
////////////////////////////////////////////////////////////////////
#else // TEST
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <string>
#include <iostream>
#include <vector>
using namespace std;
#include "debuglog.h"
#include "cancelcheck.h"
#include "execmd.h"
static int op_flags;
#define OPT_MOINS 0x1
#define OPT_b 0x4
#define OPT_w 0x8
#define OPT_c 0x10
#define OPT_r 0x20
const char *data = "Une ligne de donnees\n";
class MEAdv : public ExecCmdAdvise {
public:
ExecCmd *cmd;
void newData(int cnt) {
if (op_flags & OPT_c) {
static int callcnt;
if (callcnt++ == 3) {
throw CancelExcept();
}
}
cerr << "newData(" << cnt << ")" << endl;
// CancelCheck::instance().setCancel();
// CancelCheck::instance().checkCancel();
// cmd->setCancel();
}
};
class MEPv : public ExecCmdProvide {
public:
FILE *m_fp;
string *m_input;
MEPv(string *i)
: m_input(i)
{
m_fp = fopen("/etc/group", "r");
}
~MEPv() {
if (m_fp)
fclose(m_fp);
}
void newData() {
char line[1024];
if (m_fp && fgets(line, 1024, m_fp)) {
m_input->assign((const char *)line);
} else {
m_input->erase();
}
}
};
static char *thisprog;
static char usage [] =
"trexecmd [-c|-r] cmd [arg1 arg2 ...]\n"
" -c : test cancellation (ie: trexecmd -c sleep 1000)\n"
" -r : test reexec\n"
"trexecmd -w cmd : do the which thing\n"
;
static void Usage(void)
{
fprintf(stderr, "%s: usage:\n%s", thisprog, usage);
exit(1);
}
ReExec reexec;
int main(int argc, char *argv[])
{
reexec.init(argc, argv);
if (0) {
vector<string> newargs;
newargs.push_back("newarg");
newargs.push_back("newarg1");
newargs.push_back("newarg2");
newargs.push_back("newarg3");
newargs.push_back("newarg4");
reexec.insertArgs(newargs, 2);
}
thisprog = argv[0];
argc--; argv++;
while (argc > 0 && **argv == '-') {
(*argv)++;
if (!(**argv))
/* Cas du "adb - core" */
Usage();
while (**argv)
switch (*(*argv)++) {
case 'c': op_flags |= OPT_c; break;
case 'r': op_flags |= OPT_r; break;
case 'w': op_flags |= OPT_w; break;
default: Usage(); break;
}
b1: argc--; argv++;
}
if (argc < 1)
Usage();
string cmd = *argv++; argc--;
vector<string> l;
while (argc > 0) {
l.push_back(*argv++); argc--;
}
DebugLog::getdbl()->setloglevel(DEBDEB1);
DebugLog::setfilename("stderr");
signal(SIGPIPE, SIG_IGN);
if (op_flags & OPT_r) {
chdir("/");
argv[0] = strdup("");
sleep(1);
reexec.reexec();
}
if (op_flags & OPT_w) {
string path;
if (ExecCmd::which(cmd, path)) {
cout << path << endl;
exit(0);
}
exit(1);
}
ExecCmd mexec;
MEAdv adv;
adv.cmd = &mexec;
mexec.setAdvise(&adv);
mexec.setTimeout(5);
mexec.setStderr("/tmp/trexecStderr");
mexec.putenv("TESTVARIABLE1=TESTVALUE1");
mexec.putenv("TESTVARIABLE2=TESTVALUE2");
mexec.putenv("TESTVARIABLE3=TESTVALUE3");
string input, output;
// input = data;
string *ip = 0;
ip = &input;
MEPv pv(&input);
mexec.setProvide(&pv);
int status = -1;
try {
status = mexec.doexec(cmd, l, ip, &output);
} catch (CancelExcept) {
cerr << "CANCELLED" << endl;
}
fprintf(stderr, "Status: 0x%x\n", status);
cout << output;
exit (status >> 8);
}
#endif // TEST