| /* |
| * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| |
| #include "childproc.h" |
| |
| extern int errno; |
| |
| #define ALLOC(X,Y) { \ |
| void *mptr; \ |
| mptr = malloc (Y); \ |
| if (mptr == 0) { \ |
| error (fdout, ERR_MALLOC); \ |
| } \ |
| X = mptr; \ |
| } |
| |
| #define ERR_MALLOC 1 |
| #define ERR_PIPE 2 |
| #define ERR_ARGS 3 |
| |
| void error (int fd, int err) { |
| write (fd, &err, sizeof(err)); |
| exit (1); |
| } |
| |
| void shutItDown() { |
| fprintf(stdout, "This command is not for general use and should "); |
| fprintf(stdout, "only be run as the result of a call to\n"); |
| fprintf(stdout, "ProcessBuilder.start() or Runtime.exec() in a java "); |
| fprintf(stdout, "application\n"); |
| _exit(1); |
| } |
| |
| /* |
| * read the following off the pipefd |
| * - the ChildStuff struct |
| * - the SpawnInfo struct |
| * - the data strings for fields in ChildStuff |
| */ |
| void initChildStuff (int fdin, int fdout, ChildStuff *c) { |
| int n; |
| int argvBytes, nargv, envvBytes, nenvv; |
| int dirlen; |
| char *buf; |
| SpawnInfo sp; |
| int bufsize, offset=0; |
| int magic; |
| int res; |
| |
| res = readFully (fdin, &magic, sizeof(magic)); |
| if (res != 4 || magic != magicNumber()) { |
| error (fdout, ERR_PIPE); |
| } |
| |
| if (readFully (fdin, c, sizeof(*c)) == -1) { |
| error (fdout, ERR_PIPE); |
| } |
| |
| if (readFully (fdin, &sp, sizeof(sp)) == -1) { |
| error (fdout, ERR_PIPE); |
| } |
| |
| bufsize = sp.argvBytes + sp.envvBytes + |
| sp.dirlen + sp.parentPathvBytes; |
| |
| ALLOC(buf, bufsize); |
| |
| if (readFully (fdin, buf, bufsize) == -1) { |
| error (fdout, ERR_PIPE); |
| } |
| |
| /* Initialize argv[] */ |
| ALLOC(c->argv, sizeof(char *) * sp.nargv); |
| initVectorFromBlock (c->argv, buf+offset, sp.nargv-1); |
| offset += sp.argvBytes; |
| |
| /* Initialize envv[] */ |
| if (sp.nenvv == 0) { |
| c->envv = 0; |
| } else { |
| ALLOC(c->envv, sizeof(char *) * sp.nenvv); |
| initVectorFromBlock (c->envv, buf+offset, sp.nenvv-1); |
| offset += sp.envvBytes; |
| } |
| |
| /* Initialize pdir */ |
| if (sp.dirlen == 0) { |
| c->pdir = 0; |
| } else { |
| c->pdir = buf+offset; |
| offset += sp.dirlen; |
| } |
| |
| /* Initialize parentPathv[] */ |
| ALLOC(parentPathv, sizeof (char *) * sp.nparentPathv) |
| initVectorFromBlock ((const char**)parentPathv, buf+offset, sp.nparentPathv-1); |
| offset += sp.parentPathvBytes; |
| } |
| |
| int main(int argc, char *argv[]) { |
| ChildStuff c; |
| int t; |
| struct stat buf; |
| /* argv[0] contains the fd number to read all the child info */ |
| int r, fdin, fdout; |
| |
| r = sscanf (argv[argc-1], "%d:%d", &fdin, &fdout); |
| if (r == 2 && fcntl(fdin, F_GETFD) != -1) { |
| fstat(fdin, &buf); |
| if (!S_ISFIFO(buf.st_mode)) |
| shutItDown(); |
| } else { |
| shutItDown(); |
| } |
| initChildStuff (fdin, fdout, &c); |
| |
| childProcess (&c); |
| return 0; /* NOT REACHED */ |
| } |