strcpy(data + p, pty_argv[i]);
	    p += strlen(pty_argv[i]) + 1;
	}
	assert(p == size);
    }

    sprintf(option, "---[%d,%d]", pipefd[0], size);
    noncloexec(pipefd[0]);
    fork_and_exec_self(inst, pipefd[1], option, NULL);
    close(pipefd[0]);

    i = ret = 0;
    while (i < size && (ret = write(pipefd[1], data + i, size - i)) > 0)
	i += ret;
    if (ret < 0)

#define stricmp strcasecmp

/* BSD-semantics version of signal(), and another helpful function */
void (*putty_signal(int sig, void (*func)(int)))(int);
void block_signal(int sig, int block_it);

/* uxmisc.c */
void cloexec(int);
void noncloexec(int);
int nonblock(int);
int no_nonblock(int);

/*
 * Exports from unicode.c.
 */
struct unicode_data;
int init_ucs(struct unicode_data *ucsdata, char *line_codepage,
	     int utf8_override, int font_charset, int vtmode);

/*
 * PuTTY miscellaneous Unix stuff
 */

#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <errno.h>
#include <unistd.h>
#include <time.h>
#include <sys/time.h>
#include <sys/types.h>
#include <pwd.h>

#include "putty.h"

	  "PuTTY Master Key (RSA), 1024-bit:\n"
	  "  " PGP_RSA_MASTER_KEY_FP "\n"
	  "PuTTY Master Key (DSA), 1024-bit:\n"
	  "  " PGP_DSA_MASTER_KEY_FP "\n", stdout);
}

/*
 * Set and clear fcntl options on a file descriptor. We don't
 * realistically expect any of these operations to fail (the most
 * plausible error condition is EBADF, but we always believe ourselves
 * to be passing a valid fd so even that's an assertion-fail sort of
 * response), so we don't make any effort to return sensible error
 * codes to the caller - we just log to standard error and die
 * unceremoniously. However, nonblock and no_nonblock do return the
 * previous state of O_NONBLOCK.
 */
void cloexec(int fd) {
    int fdflags;

    fdflags = fcntl(fd, F_GETFD);
    if (fdflags < 0) {
        fprintf(stderr, "%d: fcntl(F_GETFD): %s\n", fd, strerror(errno));
        exit(1);
    }
    if (fcntl(fd, F_SETFD, fdflags | FD_CLOEXEC) < 0) {
        fprintf(stderr, "%d: fcntl(F_SETFD): %s\n", fd, strerror(errno));
        exit(1);
    }
}
void noncloexec(int fd) {
    int fdflags;

    fdflags = fcntl(fd, F_GETFD);
    if (fdflags < 0) {
        fprintf(stderr, "%d: fcntl(F_GETFD): %s\n", fd, strerror(errno));
        exit(1);
    }
    if (fcntl(fd, F_SETFD, fdflags & ~FD_CLOEXEC) < 0) {
        fprintf(stderr, "%d: fcntl(F_SETFD): %s\n", fd, strerror(errno));
        exit(1);
    }
}
int nonblock(int fd) {
    int fdflags;

    fdflags = fcntl(fd, F_GETFL);
    if (fdflags < 0) {
        fprintf(stderr, "%d: fcntl(F_GETFL): %s\n", fd, strerror(errno));
        exit(1);
    }
    if (fcntl(fd, F_SETFL, fdflags | O_NONBLOCK) < 0) {
        fprintf(stderr, "%d: fcntl(F_SETFL): %s\n", fd, strerror(errno));
        exit(1);
    }

    return fdflags & O_NONBLOCK;
}
int no_nonblock(int fd) {
    int fdflags;

    fdflags = fcntl(fd, F_GETFL);
    if (fdflags < 0) {
        fprintf(stderr, "%d: fcntl(F_GETFL): %s\n", fd, strerror(errno));
        exit(1);
    }
    if (fcntl(fd, F_SETFL, fdflags & ~O_NONBLOCK) < 0) {
        fprintf(stderr, "%d: fcntl(F_SETFL): %s\n", fd, strerror(errno));
        exit(1);
    }

    return fdflags & O_NONBLOCK;
}

FILE *f_open(const Filename *filename, char const *mode, int is_private)
{
    if (!is_private) {
	return fopen(filename->path, mode);
    } else {

static int try_connect(Actual_Socket sock)
{
    int s;
    union sockaddr_union u;
    const union sockaddr_union *sa;
    int err = 0;
    short localport;
    int salen, family;

    /*
     * Remove the socket from the tree before we overwrite its
     * internal socket id, because that forms part of the tree's
     * sorting criterion. We'll add it back before exiting this
     * function, whether we changed anything or not.
     */

	break;

      default:
	assert(0 && "unknown address family");
	exit(1); /* XXX: GCC doesn't understand assert() on some systems. */
    }

    nonblock(s);



    if ((connect(s, &(sa->sa), salen)) < 0) {
	if ( errno != EINPROGRESS ) {
	    err = errno;
	    goto ret;
	}
    } else {

	    /*
	     * On a listening socket, the readability event means a
	     * connection is ready to be accepted.
	     */
	    union sockaddr_union su;
	    socklen_t addrlen = sizeof(su);
	    int t;  /* socket of connection */


	    memset(&su, 0, addrlen);
	    t = accept(s->s, &su.sa, &addrlen);
	    if (t < 0) {
		break;
	    }

            nonblock(t);



	    if (s->localhost_only &&
		!sockaddr_is_loopback(&su.sa)) {
		close(t);	       /* someone let nonlocal through?! */
	    } else if (plug_accepting(s->plug, t)) {
		close(t);	       /* denied or error */
	    }

enum { EOF_NO, EOF_PENDING, EOF_SENT } outgoingeof;

int try_output(int is_stderr)
{
    bufchain *chain = (is_stderr ? &stderr_data : &stdout_data);
    int fd = (is_stderr ? STDERR_FILENO : STDOUT_FILENO);
    void *senddata;
    int sendlen, ret;

    if (bufchain_size(chain) > 0) {
        int prev_nonblock = nonblock(fd);


        do {
            bufchain_prefix(chain, &senddata, &sendlen);
            ret = write(fd, senddata, sendlen);
            if (ret > 0)
                bufchain_consume(chain, ret);
        } while (ret == sendlen && bufchain_size(chain) != 0);
        if (!prev_nonblock)
            no_nonblock(fd);
        if (ret < 0 && errno != EAGAIN) {
            perror(is_stderr ? "stderr: write" : "stdout: write");
            exit(1);
        }
    }
    if (outgoingeof == EOF_PENDING && bufchain_size(&stdout_data) == 0) {
        close(STDOUT_FILENO);

    } else if (pid == 0) {
	close(0);
	close(1);
	dup2(to_cmd_pipe[0], 0);
	dup2(from_cmd_pipe[1], 1);
	close(to_cmd_pipe[0]);
	close(from_cmd_pipe[1]);
	noncloexec(0);
	noncloexec(1);
	execl("/bin/sh", "sh", "-c", cmd, (void *)NULL);
	_exit(255);
    }

    sfree(cmd);

    close(to_cmd_pipe[0]);

    cloexec(pty->master_fd);

    pty->name[FILENAME_MAX-1] = '\0';
    strncpy(pty->name, ptsname(pty->master_fd), FILENAME_MAX-1);
#endif






    nonblock(pty->master_fd);




    if (!ptys_by_fd)
	ptys_by_fd = newtree234(pty_compare_by_fd);
    add234(ptys_by_fd, pty);
}

/*