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135 lines
3.7 KiB
C
135 lines
3.7 KiB
C
/*-
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* Copyright (C) 2005 Max Okumoto.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <unistd.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include "proc.h"
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#include "shell.h"
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#include "util.h"
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/**
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* Replace the current process.
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*/
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void
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Proc_Exec(const ProcStuff *ps)
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{
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if (ps->in != STDIN_FILENO) {
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/*
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* Redirect the child's stdin to the input fd
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* and reset it to the beginning (again).
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*/
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if (dup2(ps->in, STDIN_FILENO) == -1)
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Punt("Cannot dup2: %s", strerror(errno));
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lseek(STDIN_FILENO, (off_t)0, SEEK_SET);
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}
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if (ps->out != STDOUT_FILENO) {
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/*
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* Redirect the child's stdout to the output fd.
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*/
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if (dup2(ps->out, STDOUT_FILENO) == -1)
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Punt("Cannot dup2: %s", strerror(errno));
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close(ps->out);
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}
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if (ps->err != STDERR_FILENO) {
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/*
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* Redirect the child's stderr to the err fd.
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*/
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if (dup2(ps->err, STDERR_FILENO) == -1)
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Punt("Cannot dup2: %s", strerror(errno));
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close(ps->err);
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}
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if (ps->merge_errors) {
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/*
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* Send stderr to parent process too.
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*/
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if (dup2(STDOUT_FILENO, STDERR_FILENO) == -1)
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Punt("Cannot dup2: %s", strerror(errno));
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}
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if (commandShell->unsetenv) {
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/* for the benfit of ksh */
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unsetenv("ENV");
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}
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/*
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* The file descriptors for stdin, stdout, or stderr might
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* have been marked close-on-exec. Clear the flag on all
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* of them.
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*/
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fcntl(STDIN_FILENO, F_SETFD,
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fcntl(STDIN_FILENO, F_GETFD) & (~FD_CLOEXEC));
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fcntl(STDOUT_FILENO, F_SETFD,
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fcntl(STDOUT_FILENO, F_GETFD) & (~FD_CLOEXEC));
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fcntl(STDERR_FILENO, F_SETFD,
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fcntl(STDERR_FILENO, F_GETFD) & (~FD_CLOEXEC));
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if (ps->pgroup) {
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#ifdef USE_PGRP
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/*
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* Become a process group leader, so we can kill it and all
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* its descendants in one fell swoop, by killing its process
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* family, but not commit suicide.
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*/
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#if defined(SYSV)
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setsid();
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#else
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setpgid(0, getpid());
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#endif
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#endif /* USE_PGRP */
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}
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if (ps->searchpath) {
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execvp(ps->argv[0], ps->argv);
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write(STDERR_FILENO, ps->argv[0], strlen(ps->argv[0]));
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write(STDERR_FILENO, ":", 1);
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write(STDERR_FILENO, strerror(errno), strlen(strerror(errno)));
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write(STDERR_FILENO, "\n", 1);
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} else {
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execv(commandShell->path, ps->argv);
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write(STDERR_FILENO,
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"Could not execute shell\n",
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sizeof("Could not execute shell"));
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}
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/*
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* Since we are the child process, exit without flushing buffers.
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*/
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_exit(1);
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}
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