diff options
Diffstat (limited to 'usr.bin/make/proc.c')
| -rw-r--r-- | usr.bin/make/proc.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/usr.bin/make/proc.c b/usr.bin/make/proc.c new file mode 100644 index 0000000..3a7e4f6 --- /dev/null +++ b/usr.bin/make/proc.c @@ -0,0 +1,134 @@ +/*- + * Copyright (C) 2005 Max Okumoto. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <unistd.h> +#include <errno.h> +#include <stdlib.h> +#include <string.h> +#include <fcntl.h> + +#include "proc.h" +#include "shell.h" +#include "util.h" + +/** + * Replace the current process. + */ +void +Proc_Exec(const ProcStuff *ps) +{ + + if (ps->in != STDIN_FILENO) { + /* + * Redirect the child's stdin to the input fd + * and reset it to the beginning (again). + */ + if (dup2(ps->in, STDIN_FILENO) == -1) + Punt("Cannot dup2: %s", strerror(errno)); + lseek(STDIN_FILENO, (off_t)0, SEEK_SET); + } + + if (ps->out != STDOUT_FILENO) { + /* + * Redirect the child's stdout to the output fd. + */ + if (dup2(ps->out, STDOUT_FILENO) == -1) + Punt("Cannot dup2: %s", strerror(errno)); + close(ps->out); + } + + if (ps->err != STDERR_FILENO) { + /* + * Redirect the child's stderr to the err fd. + */ + if (dup2(ps->err, STDERR_FILENO) == -1) + Punt("Cannot dup2: %s", strerror(errno)); + close(ps->err); + } + + if (ps->merge_errors) { + /* + * Send stderr to parent process too. + */ + if (dup2(STDOUT_FILENO, STDERR_FILENO) == -1) + Punt("Cannot dup2: %s", strerror(errno)); + } + + if (commandShell->unsetenv) { + /* for the benfit of ksh */ + unsetenv("ENV"); + } + + /* + * The file descriptors for stdin, stdout, or stderr might + * have been marked close-on-exec. Clear the flag on all + * of them. + */ + fcntl(STDIN_FILENO, F_SETFD, + fcntl(STDIN_FILENO, F_GETFD) & (~FD_CLOEXEC)); + fcntl(STDOUT_FILENO, F_SETFD, + fcntl(STDOUT_FILENO, F_GETFD) & (~FD_CLOEXEC)); + fcntl(STDERR_FILENO, F_SETFD, + fcntl(STDERR_FILENO, F_GETFD) & (~FD_CLOEXEC)); + + if (ps->pgroup) { +#ifdef USE_PGRP + /* + * Become a process group leader, so we can kill it and all + * its descendants in one fell swoop, by killing its process + * family, but not commit suicide. + */ +#if defined(SYSV) + setsid(); +#else + setpgid(0, getpid()); +#endif +#endif /* USE_PGRP */ + } + + if (ps->searchpath) { + execvp(ps->argv[0], ps->argv); + + write(STDERR_FILENO, ps->argv[0], strlen(ps->argv[0])); + write(STDERR_FILENO, ": ", 2); + write(STDERR_FILENO, strerror(errno), strlen(strerror(errno))); + write(STDERR_FILENO, "\n", 1); + } else { + execv(commandShell->path, ps->argv); + + write(STDERR_FILENO, + "Could not execute shell\n", + sizeof("Could not execute shell")); + } + + /* + * Since we are the child process, exit without flushing buffers. + */ + _exit(1); +} |
