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Diffstat (limited to 'src/lib/openpty.cc')
| -rw-r--r-- | src/lib/openpty.cc | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/src/lib/openpty.cc b/src/lib/openpty.cc new file mode 100644 index 00000000..4262832e --- /dev/null +++ b/src/lib/openpty.cc @@ -0,0 +1,171 @@ +/* + Copyright (c) 1991-2002, The Numerical ALgorithms Group Ltd. + All rights reserved. + Copyright (C) 2007-2013, Gabriel Dos Reis. + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + - Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + + - 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. + + - Neither the name of The Numerical ALgorithms Group Ltd. nor the + names of its contributors may be used to endorse or promote products + derived from this software without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 THE COPYRIGHT OWNER + 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. +*/ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <stdlib.h> +#include <unistd.h> +#include <stdio.h> +#include <fcntl.h> +#include <string.h> + +#ifdef HAVE_SYS_IOCTL_H +# include <sys/ioctl.h> +#endif +#ifdef HAVE_PTY_H +# include <pty.h> +#endif +#ifdef HAVE_UTIL_H +# include <util.h> +#endif +#ifdef HAVE_TERMIOS_H +# include <termios.h> +#endif +#ifdef HAVE_LIBUTIL_H +# include <sys/types.h> +# include <libutil.h> +#endif + + +#include "openpty.h" + +#if defined(SUNplatform) +static void +makeNextPtyNames(char *cont,char * serv) +{ + static int channelNo = 0; + static char group[] = "pqrstuvwxyzPQRST"; + static int groupNo = 0; + + sprintf(cont, "/dev/pty%c%x", group[groupNo], channelNo); + sprintf(serv, "/dev/tty%c%x", group[groupNo], channelNo); + channelNo++; /* try next */ + if (channelNo == 16) { /* move to new group */ + channelNo = 0; + groupNo++; + if (groupNo == 16) groupNo = 0; /* recycle */ + } +} +#endif + + +/* + * The main function is ptyopen. It simply opens up both sides of a + * pseudo-terminal. It uses and saves the pathnames for + * the devices which were actually opened. + * + * If it fails it simply exits the program. + * + * + * ptyopen(controller, server, controllerPath, serverPath) + * int *controller; The file descriptor for controller side of the pty + * int *server; The file descriptor for the server side + * char *serverPath; + * + * The path name vars should be declared of size 11 or more + */ + + +int +ptyopen(int *controller,int * server,char * serverPath) +{ +#if HAVE_DECL_OPENPTY + return openpty(controller,server, serverPath, NULL, NULL); +#elif defined(SUNplatform) + int looking = 1, i; + int oflag = O_RDWR; /* flag for opening the pty */ + char controllerPath[128]; + + for (i = 0; looking && i < 1000; i++) { + makeNextPtyNames(controllerPath, serverPath); + if (access(controllerPath, 6) != 0) continue; + *controller = open(controllerPath, oflag, 0); + if (*controller >= 0) { + *server = open(serverPath, oflag, 0); + if (*server > 0) + looking = 0; + else + close(*controller); + } + } + if (looking) { + fprintf(stderr, "Couldn't find a free pty.\n"); + exit(-1); + } + return (*controller); +#elif defined(SUN4OS5platform) +extern int grantpt(int); +extern int unlockpt(int); +extern char* ptsname(int); + int fdm,fds; + char *slavename; + + /* open master */ + if ((fdm = open("/dev/ptmx", O_RDWR)) < 0 ) + perror("ptyopen: Failed to open /dev/ptmx"); + else { + /* change permission ofslave */ + if (grantpt(fdm) < 0) + perror("ptyopen: Failed to grant access to slave device"); + /* unlock slave */ + if (unlockpt(fdm) < 0) + perror("ptyopen: Failed to unlock master/slave pair"); + /* get name of slave */ + if ((slavename = ptsname(fdm)) == NULL) + perror("ptyopen: Failed to get name of slave device"); + /* open slave */ + if ((fds = open(slavename, O_RDWR)) < 0 ) + perror("ptyopen: Failed to open slave"); + else { + /* push ptem */ + if (ioctl(fds, I_PUSH, "ptem") < 0) + perror("ptyopen: Failed to push ptem"); + /* push ldterm */ + if (ioctl(fds, I_PUSH, "ldterm") < 0) + perror("ptyopen: Failed to push idterm"); + strcpy(serverPath,slavename); + *controller=fdm; + *server=fds; + } + } + return(fdm); +#else +# error "don't know how to open a pty" +#endif +} + + |