static int setup_fds(void)
{
if (fd_ctor(&g_fdi, 0, g_opts.fd[0], g_opts.fsync) < 0)
if (fd_ctor_f(&g_fdi, 0, g_opts.file[0], g_opts.fsync) < 0)
if (fd_ctor_s(&g_fdi, 0, &g_opts.sock[0], !g_opts.rline) < 0)
if (fd_ctor(&g_fdi, 0, "0", 0) < 0)
return -1;
if (fd_ctor(&g_fdo, 1, g_opts.fd[1], g_opts.fsync) < 0)
if (fd_ctor_f(&g_fdo, 1, g_opts.file[1], g_opts.fsync) < 0)
if (fd_ctor_s(&g_fdo, 1, &g_opts.sock[1], 0) < 0)
if (fd_ctor(&g_fdo, 1, "1", g_opts.fsync) < 0)
goto out;
fprintf (stderr, "\nPre-open input side:\n");
fd_info(&g_fdi);
fprintf (stderr, "\nPre-open output side:\n");
fd_info(&g_fdo);
if (g_opts.strict)
fputs("\nStrict reblocking writes enabled.\n", stderr);
fflush(stderr);
return 0;
out:
fd_dtor(&g_fdi);
return -1;
}
/* Given pipe, plumb it to standard output, then execute Nth command */
static void exec_pipe_command(int ncmds, char ***cmds, Pipe output)
{
assert(ncmds >= 1);
/* Fix stdout to write end of pipe */
err_remark("Pipe: r %d, w %d", output[0], output[1]);
if (dup2(output[1], 1) != 1)
err_sysexit("dup2(%d, %d) in %s()", output[1], 1, __func__);
if (close(output[0]) != 0)
err_sysexit("close(%d) in %s()", output[0], __func__);
if (close(output[1]) != 0)
err_sysexit("close(%d) in %s()", output[0], __func__);
if (vflag)
{
open_fds(10);
fd_info(0);
err_remark("Execute: %s\n", cmds[ncmds - 1][0]);
}
exec_nth_command(ncmds, cmds);
}
int main(int argc, char **argv)
{
int opt;
char *argv0 = argv[0];
setvbuf(stderr, 0, _IOLBF, BUFSIZ);
err_setarg0(argv[0]);
sigchld_status();
while ((opt = getopt(argc, argv, "v")) != -1)
{
switch (opt)
{
case 'v':
vflag = 1;
break;
default:
err_usage("[-v] [cmd1 | cmd2 ...]");
break;
}
}
argv += optind - 1;
argc -= optind - 1;
argv[0] = argv0;
fd_info(0);
if (argc == 1)
{
/* Run the built in pipe-line */
exec_pipeline(ncmds, cmds);
}
else
{
/* Run command line specified by user */
exec_arguments(argc, argv);
}
corpse_collector();
return(0);
}
/* With the standard output plumbing sorted, execute Nth command */
static void exec_nth_command(int ncmds, char ***cmds)
{
assert(ncmds >= 1);
if (ncmds > 1)
{
pid_t pid;
Pipe input;
if (pipe(input) != 0)
err_sysexit("Failed to create pipe");
err_remark("Pipe: r %d, w %d", input[0], input[1]);
if (vflag)
open_fds(10);
if ((pid = fork()) < 0)
err_sysexit("Failed to fork");
if (pid == 0)
{
/* Child */
exec_pipe_command(ncmds - 1, cmds, input);
}
/* Fix standard input to read end of pipe */
if (dup2(input[0], 0) != 0)
err_sysexit("dup2(%d, %d) in %s()", input[0], 0, __func__);
if (close(input[0]) != 0)
err_sysexit("close(%d) in %s()", input[0], __func__);
if (close(input[1]) != 0)
err_sysexit("close(%d) in %s()", input[0], __func__);
}
if (vflag)
{
open_fds(10);
fd_info(0);
err_remark("Execute: %s\n", cmds[ncmds - 1][0]);
}
execvp(cmds[ncmds - 1][0], cmds[ncmds - 1]);
err_sysexit("Failed to exec %s", cmds[ncmds - 1][0]);
/*NOTREACHED*/
}