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/* -*- c-file-style: "java"; indent-tabs-mode: nil; fill-column: 78; -*-
*
* distcc -- A simple distributed compiler system
*
* Copyright (C) 2002, 2003 by Martin Pool <mbp@samba.org>
*
* 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
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <time.h>
#include <sys/types.h>
#include <pwd.h>
#include <sys/stat.h>
#include <sys/file.h>
#include "exitcode.h"
#include "logging.h"
#include "util.h"
using namespace std;
/**
* Set the `FD_CLOEXEC' flag of DESC if VALUE is nonzero,
* or clear the flag if VALUE is 0.
*
* From the GNU C Library examples.
*
* @returns 0 on success, or -1 on error with `errno' set.
**/
int set_cloexec_flag (int desc, int value)
{
int oldflags = fcntl (desc, F_GETFD, 0);
/* If reading the flags failed, return error indication now. */
if (oldflags < 0)
return oldflags;
/* Set just the flag we want to set. */
if (value != 0)
oldflags |= FD_CLOEXEC;
else
oldflags &= ~FD_CLOEXEC;
/* Store modified flag word in the descriptor. */
return fcntl (desc, F_SETFD, oldflags);
}
/**
* Ignore or unignore SIGPIPE.
*
* The server and child ignore it, because distcc code wants to see
* EPIPE errors if something goes wrong. However, for invoked
* children it is set back to the default value, because they may not
* handle the error properly.
**/
int dcc_ignore_sigpipe(int val)
{
if (signal(SIGPIPE, val ? SIG_IGN : SIG_DFL) == SIG_ERR) {
log_warning() << "signal(SIGPIPE, " << ( val ? "ignore" : "default" ) << ") failed: "
<< strerror(errno) << endl;
return EXIT_DISTCC_FAILED;
}
return 0;
}
/**
* Return a pointer to the basename of the file (everything after the
* last slash.) If there is no slash, return the whole filename,
* which is presumably in the current directory.
**/
string find_basename(const string &sfile)
{
size_t index = sfile.find_last_of( '/' );
if ( index == string::npos )
return sfile;
return sfile.substr( index + 1);
}
/**
* Get an exclusive, non-blocking lock on a file using whatever method
* is available on this system.
*
* @retval 0 if we got the lock
* @retval -1 with errno set if the file is already locked.
**/
static int sys_lock(int fd, bool block)
{
#if defined(F_SETLK)
struct flock lockparam;
lockparam.l_type = F_WRLCK;
lockparam.l_whence = SEEK_SET;
lockparam.l_start = 0;
lockparam.l_len = 0; /* whole file */
return fcntl(fd, block ? F_SETLKW : F_SETLK, &lockparam);
#elif defined(HAVE_FLOCK)
return flock(fd, LOCK_EX | (block ? 0 : LOCK_NB));
#elif defined(HAVE_LOCKF)
return lockf(fd, block ? F_LOCK : F_TLOCK, 0);
#else
# error "No supported lock method. Please port this code."
#endif
}
bool dcc_unlock(int lock_fd)
{
/* All our current locks can just be closed */
if (close(lock_fd)) {
log_perror("close failed:");
return false;
}
return true;
}
/**
* Open a lockfile, creating if it does not exist.
**/
static bool dcc_open_lockfile(const string &fname, int &plockfd)
{
/* Create if it doesn't exist. We don't actually do anything with
* the file except lock it.
*
* The file is created with the loosest permissions allowed by the user's
* umask, to give the best chance of avoiding problems if they should
* happen to use a shared lock dir. */
plockfd = open(fname.c_str(), O_WRONLY|O_CREAT, 0666);
if (plockfd == -1 && errno != EEXIST) {
log_error() << "failed to creat " << fname << ": " << strerror(errno) << endl;
return false;
}
return true;
}
bool dcc_lock_host(int &lock_fd)
{
string fname = "/tmp/.icecream-";
struct passwd *pwd = getpwuid( getuid() );
if ( pwd )
fname += pwd->pw_name;
else {
char buffer[10];
sprintf( buffer, "%ld", ( long )getuid() );
fname += buffer;
}
if ( mkdir( fname.c_str(), 0700 ) && errno != EEXIST ) {
log_perror( "mkdir" );
return false;
}
fname += "/local_lock";
lock_fd = 0;
if (!dcc_open_lockfile(fname, lock_fd) )
return false;
if (sys_lock(lock_fd, true) == 0) {
return true;
} else {
switch (errno) {
#if defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN
case EWOULDBLOCK:
#endif
case EAGAIN:
case EACCES: /* HP-UX and Cygwin give this for exclusion */
trace() << fname << " is busy" << endl;
break;
default:
log_error() << "lock " << fname << " failed: " << strerror(errno) << endl;
break;
}
::close(lock_fd);
return false;
}
}
bool colorify_wanted()
{
const char* term_env = getenv("TERM");
return isatty(2) && !getenv("EMACS") && term_env && strcasecmp(term_env, "DUMB");
}
void colorify_output(const string& _s_ccout)
{
string s_ccout(_s_ccout);
string::size_type end;
while ( (end = s_ccout.find('\n')) != string::npos ) {
string cline = s_ccout.substr(string::size_type(0), end );
s_ccout = s_ccout.substr(end+1);
if (cline.find(": error:") != string::npos)
fprintf(stderr, "\x1b[1;31m%s\x1b[0m\n", cline.c_str());
else if (cline.find(": warning:") != string::npos)
fprintf(stderr, "\x1b[36m%s\x1b[0m\n", cline.c_str());
else
fprintf(stderr, "%s\n", cline.c_str());
}
fprintf(stderr, "%s", s_ccout.c_str());
}
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