diff options
Diffstat (limited to 'libc/stdlib')
| -rw-r--r-- | libc/stdlib/Makefile | 3 | ||||
| -rw-r--r-- | libc/stdlib/bsd_getpt.c | 78 | ||||
| -rw-r--r-- | libc/stdlib/getpt.c | 89 | ||||
| -rw-r--r-- | libc/stdlib/grantpt.c | 66 | ||||
| -rw-r--r-- | libc/stdlib/ptsname.c | 171 | ||||
| -rw-r--r-- | libc/stdlib/pty-private.h | 42 | ||||
| -rw-r--r-- | libc/stdlib/unix_grantpt.c | 197 | ||||
| -rw-r--r-- | libc/stdlib/unlockpt.c | 49 |
8 files changed, 694 insertions, 1 deletions
diff --git a/libc/stdlib/Makefile b/libc/stdlib/Makefile index 123841959..46276668b 100644 --- a/libc/stdlib/Makefile +++ b/libc/stdlib/Makefile @@ -38,7 +38,8 @@ MOBJ2=atexit.o exit.o CSRC = abort.c getenv.c mktemp.c qsort.c realpath.c abs.c bsearch.c \ - mkstemp.c putenv.c rand.c random.c setenv.c system.c div.c ldiv.c + mkstemp.c putenv.c rand.c random.c setenv.c system.c div.c ldiv.c \ + getpt.c ptsname.c grantpt.c unlockpt.c ifeq ($(HAS_FLOATS),true) CSRC += strtod.c endif diff --git a/libc/stdlib/bsd_getpt.c b/libc/stdlib/bsd_getpt.c new file mode 100644 index 000000000..0f981ab95 --- /dev/null +++ b/libc/stdlib/bsd_getpt.c @@ -0,0 +1,78 @@ +/* Copyright (C) 1998, 1999 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <errno.h> +#include <fcntl.h> +#include <string.h> +#include <unistd.h> + + +/* Prefix for master pseudo terminal nodes. */ +#define _PATH_PTY "/dev/pty" + + +/* Letters indicating a series of pseudo terminals. */ +#ifndef PTYNAME1 +#define PTYNAME1 "pqrsPQRS" +#endif +const char _ptyname1[] = PTYNAME1; + +/* Letters indicating the position within a series. */ +#ifndef PTYNAME2 +#define PTYNAME2 "0123456789abcdefghijklmnopqrstuv"; +#endif +const char _ptyname2[] = PTYNAME2; + + +/* Open a master pseudo terminal and return its file descriptor. */ +int +__getpt (void) +{ + char buf[sizeof (_PATH_PTY) + 2]; + const char *p, *q; + char *s; + + memcpy (buf, _PATH_PTY, sizeof (_PATH_PTY) - 1); + s = buf + strlen (buf); + + /* s[0] and s[1] will be filled in the loop. */ + s[2] = '\0'; + + for (p = _ptyname1; *p != '\0'; ++p) + { + s[0] = *p; + + for (q = _ptyname2; *q != '\0'; ++q) + { + int fd; + + s[1] = *q; + + fd = open (buf, O_RDWR); + if (fd != -1) + return fd; + + if (errno == ENOENT) + return -1; + } + } + + errno = ENOENT; + return -1; +} diff --git a/libc/stdlib/getpt.c b/libc/stdlib/getpt.c new file mode 100644 index 000000000..74f009a95 --- /dev/null +++ b/libc/stdlib/getpt.c @@ -0,0 +1,89 @@ +/* Copyright (C) 1998, 1999 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <errno.h> +#include <fcntl.h> +#include <stdlib.h> +#include <unistd.h> +#include <paths.h> +#include <sys/statfs.h> + +/* Constant that identifies the `devpts' filesystem. */ +#define DEVPTS_SUPER_MAGIC 0x1cd1 +/* Constant that identifies the `devfs' filesystem. */ +#define DEVFS_SUPER_MAGIC 0x1373 + +/* Path to the master pseudo terminal cloning device. */ +#define _PATH_DEVPTMX _PATH_DEV "ptmx" +/* Directory containing the UNIX98 pseudo terminals. */ +#define _PATH_DEVPTS _PATH_DEV "pts" + +/* Prototype for function that opens BSD-style master pseudo-terminals. */ +int __bsd_getpt (void); + +/* Open a master pseudo terminal and return its file descriptor. */ +int +getpt (void) +{ + static int have_no_dev_ptmx; + int fd; + + if (!have_no_dev_ptmx) + { + fd = open (_PATH_DEVPTMX, O_RDWR); + if (fd != -1) + { + struct statfs fsbuf; + static int devpts_mounted; + + /* Check that the /dev/pts filesystem is mounted + or if /dev is a devfs filesystem (this implies /dev/pts). */ + if (devpts_mounted + || (statfs (_PATH_DEVPTS, &fsbuf) == 0 + && fsbuf.f_type == DEVPTS_SUPER_MAGIC) + || (statfs (_PATH_DEV, &fsbuf) == 0 + && fsbuf.f_type == DEVFS_SUPER_MAGIC)) + { + /* Everything is ok. */ + devpts_mounted = 1; + return fd; + } + + /* If /dev/pts is not mounted then the UNIX98 pseudo terminals + are not usable. */ + close (fd); + have_no_dev_ptmx = 1; + } + else + { + if (errno == ENOENT || errno == ENODEV) + have_no_dev_ptmx = 1; + else + return -1; + } + } + + return __bsd_getpt (); +} + +#define PTYNAME1 "pqrstuvwxyzabcde"; +#define PTYNAME2 "0123456789abcdef"; + +#define __getpt __bsd_getpt +#include <bsd_getpt.c> diff --git a/libc/stdlib/grantpt.c b/libc/stdlib/grantpt.c new file mode 100644 index 000000000..63f423b8f --- /dev/null +++ b/libc/stdlib/grantpt.c @@ -0,0 +1,66 @@ +/* Copyright (C) 1998, 1999 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <limits.h> +#include <stdlib.h> +#include <sys/statfs.h> + +/* Constant that identifies the `devpts' filesystem. */ +#define DEVPTS_SUPER_MAGIC 0x1cd1 +/* Constant that identifies the `devfs' filesystem. */ +#define DEVFS_SUPER_MAGIC 0x1373 + +/* Prototype for function that changes ownership and access permission + for slave pseudo terminals that do not live on a `devpts' + filesystem. */ +int __unix_grantpt (int fd); + +/* Prototype for private function that gets the name of the slave + pseudo terminal in a safe way. */ +static int pts_name (int fd, char **pts, size_t buf_len); + +/* Change the ownership and access permission of the slave pseudo + terminal associated with the master pseudo terminal specified + by FD. */ +int +grantpt (int fd) +{ + struct statfs fsbuf; +#ifdef PATH_MAX + char _buf[PATH_MAX]; +#else + char _buf[512]; +#endif + char *buf = _buf; + + if (pts_name (fd, &buf, sizeof (_buf))) + return -1; + + if (statfs (buf, &fsbuf) < 0) + return -1; + + /* If the slave pseudo terminal lives on a `devpts' filesystem, the + ownership and access permission are already set. */ + if (fsbuf.f_type == DEVPTS_SUPER_MAGIC || fsbuf.f_type == DEVFS_SUPER_MAGIC) + return 0; + + return __unix_grantpt (fd); +} + +#define grantpt __unix_grantpt +#include <unix_grantpt.c> diff --git a/libc/stdlib/ptsname.c b/libc/stdlib/ptsname.c new file mode 100644 index 000000000..2fbc6be49 --- /dev/null +++ b/libc/stdlib/ptsname.c @@ -0,0 +1,171 @@ +/* Copyright (C) 1998 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <errno.h> +#include <paths.h> +#include <stdlib.h> +#include <string.h> +#include <sys/ioctl.h> +#include <sys/stat.h> +#include <sys/sysmacros.h> +#include <termios.h> +#include <unistd.h> + +/* Check if DEV corresponds to a master pseudo terminal device. */ +#define MASTER_P(Dev) \ + (major ((Dev)) == 2 \ + || (major ((Dev)) == 4 && minor ((Dev)) >= 128 && minor ((Dev)) < 192) \ + || (major ((Dev)) >= 128 && major ((Dev)) < 136)) + +/* Check if DEV corresponds to a master pseudo terminal device. */ +#define SLAVE_P(Dev) \ + (major ((Dev)) == 3 \ + || (major ((Dev)) == 4 && minor ((Dev)) >= 192 && minor ((Dev)) < 256) \ + || (major ((Dev)) >= 136 && major ((Dev)) < 144)) + +/* Note that major number 4 corresponds to the old BSD style pseudo + terminal devices. As of Linux 2.1.115 these are no longer + supported. They have been replaced by major numbers 2 (masters) + and 3 (slaves). */ + +/* Directory where we can find the slave pty nodes. */ +#define _PATH_DEVPTS "/dev/pts/" + +/* The are declared in getpt.c. */ +extern const char _ptyname1[]; +extern const char _ptyname2[]; + +/* Static buffer for `ptsname'. */ +static char buffer[sizeof (_PATH_DEVPTS) + 20]; + +/* +extern char * +_itoa_word (unsigned long value, char *buflim, + unsigned int base, int upper_case); +*/ + + +/* Store at most BUFLEN characters of the pathname of the slave pseudo + terminal associated with the master FD is open on in BUF. + Return 0 on success, otherwise an error number. */ +int ptsname_r (int fd, char *buf, size_t buflen) +{ + int save_errno = errno; + struct stat st; + int ptyno; + + if (buf == NULL) + { + errno = EINVAL; + return EINVAL; + } + + if (!isatty (fd)) + { + errno = ENOTTY; + return ENOTTY; + } +#if 0 +#ifdef TIOCGPTN + if (ioctl (fd, TIOCGPTN, &ptyno) == 0) + { + /* Buffer we use to print the number in. For a maximum size for + `int' of 8 bytes we never need more than 20 digits. */ + char numbuf[21]; + const char *devpts = _PATH_DEVPTS; + const size_t devptslen = strlen (devpts); + char *p; + + numbuf[20] = '\0'; + p = _itoa_word (ptyno, &numbuf[20], 10, 0); + + if (buflen < devptslen + strlen (p) + 1) + { + errno = ERANGE; + return ERANGE; + } + + strcpy (buf, devpts); + strcat (buf, p); + } + else if (errno == EINVAL) +#endif +#endif + { + char *p; + + if (buflen < strlen (_PATH_TTY) + 3) + { + errno = ERANGE; + return ERANGE; + } + + if (fstat (fd, &st) < 0) + return errno; + + /* Check if FD really is a master pseudo terminal. */ + if (! MASTER_P (st.st_rdev)) + { + errno = ENOTTY; + return ENOTTY; + } + + ptyno = minor (st.st_rdev); + /* This is for the old BSD pseudo terminals. As of Linux + 2.1.115 these are no longer supported. */ + if (major (st.st_rdev) == 4) + ptyno -= 128; + + if (ptyno / 16 >= strlen (_ptyname1)) + { + errno = ENOTTY; + return ENOTTY; + } + + strcpy (buf, _PATH_TTY); + p = buf + strlen (buf); + p[0] = _ptyname1[ptyno / 16]; + p[1] = _ptyname2[ptyno % 16]; + p[2] = '\0'; + } + + if (_xstat (_STAT_VER, buf, &st) < 0) + return errno; + + /* Check if the name we're about to return really corresponds to a + slave pseudo terminal. */ + if (! S_ISCHR (st.st_mode) || ! SLAVE_P (st.st_rdev)) + { + /* This really is a configuration problem. */ + errno = ENOTTY; + return ENOTTY; + } + + errno = save_errno; + return 0; +} + +/* Return the pathname of the pseudo terminal slave assoicated with + the master FD is open on, or NULL on errors. + The returned storage is good until the next call to this function. */ +char * +ptsname (int fd) +{ + return ptsname_r (fd, buffer, sizeof (buffer)) != 0 ? NULL : buffer; +} diff --git a/libc/stdlib/pty-private.h b/libc/stdlib/pty-private.h new file mode 100644 index 000000000..621dbfd6f --- /dev/null +++ b/libc/stdlib/pty-private.h @@ -0,0 +1,42 @@ +/* Internal defenitions and declarations for pseudo terminal functions. + Copyright (C) 1998 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#ifndef _PTY_PRIVATE_H +#define _PTY_PRIVATE_H 1 + +/* The group slave pseudo terminals belong to. */ +#define TTY_GROUP "tty" + +/* The file descriptor connected to the master pseudo terminal. */ +#define PTY_FILENO 3 + +/* Path to the helper program that implements `grantpt' in user space. */ +#define _PATH_PT_CHOWN "/sbin/pt_chown" + +/* Exit codes for the helper program. */ +enum /* failure modes */ +{ + FAIL_EBADF = 1, + FAIL_EINVAL, + FAIL_EACCES, + FAIL_EXEC +}; + +#endif /* pty-private.h */ diff --git a/libc/stdlib/unix_grantpt.c b/libc/stdlib/unix_grantpt.c new file mode 100644 index 000000000..eb6ce0b35 --- /dev/null +++ b/libc/stdlib/unix_grantpt.c @@ -0,0 +1,197 @@ +/* Copyright (C) 1998 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <assert.h> +#include <errno.h> +#include <grp.h> +#include <limits.h> +#include <stdlib.h> +#include <string.h> +#include <sys/resource.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <sys/wait.h> +#include <unistd.h> + +#include "pty-private.h" + +extern int ptsname_r (int fd, char *buf, size_t buflen); + +/* Return the result of ptsname_r in the buffer pointed to by PTS, + which should be of length BUF_LEN. If it is too long to fit in + this buffer, a sufficiently long buffer is allocated using malloc, + and returned in PTS. 0 is returned upon success, -1 otherwise. */ +static int +pts_name (int fd, char **pts, size_t buf_len) +{ + int rv; + char *buf = *pts; + + for (;;) + { + char *new_buf; + + if (buf_len) + { + rv = ptsname_r (fd, buf, buf_len); + + if (rv != 0 || memchr (buf, '\0', buf_len)) + /* We either got an error, or we succeeded and the + returned name fit in the buffer. */ + break; + + /* Try again with a longer buffer. */ + buf_len += buf_len; /* Double it */ + } + else + /* No initial buffer; start out by mallocing one. */ + buf_len = 128; /* First time guess. */ + + if (buf != *pts) + /* We've already malloced another buffer at least once. */ + new_buf = realloc (buf, buf_len); + else + new_buf = malloc (buf_len); + if (! new_buf) + { + rv = -1; + errno = ENOMEM; + break; + } + buf = new_buf; + } + + if (rv == 0) + *pts = buf; /* Return buffer to the user. */ + else if (buf != *pts) + free (buf); /* Free what we malloced when returning an error. */ + + return rv; +} + +/* Change the ownership and access permission of the slave pseudo + terminal associated with the master pseudo terminal specified + by FD. */ +int +grantpt (int fd) +{ + int retval = -1; +#ifdef PATH_MAX + char _buf[PATH_MAX]; +#else + char _buf[512]; +#endif + char *buf = _buf; + struct stat st; + uid_t uid; + gid_t gid; + pid_t pid; + + if (pts_name (fd, &buf, sizeof (_buf))) + return -1; + + if (_xstat (_STAT_VER, buf, &st) < 0) + goto cleanup; + + /* Make sure that we own the device. */ + uid = getuid (); + if (st.st_uid != uid) + { + if (chown (buf, uid, st.st_gid) < 0) + goto helper; + } + + gid = getgid (); + + /* Make sure the group of the device is that special group. */ + if (st.st_gid != gid) + { + if (chown (buf, uid, gid) < 0) + goto helper; + } + + /* Make sure the permission mode is set to readable and writable by + the owner, and writable by the group. */ + if ((st.st_mode & ACCESSPERMS) != (S_IRUSR|S_IWUSR|S_IWGRP)) + { + if (chmod (buf, S_IRUSR|S_IWUSR|S_IWGRP) < 0) + goto helper; + } + + retval = 0; + goto cleanup; + + /* We have to use the helper program. */ + helper: + + pid = fork (); + if (pid == -1) + goto cleanup; + else if (pid == 0) + { + /* Disable core dumps. */ + struct rlimit rl = { 0, 0 }; + setrlimit (RLIMIT_CORE, &rl); + + /* We pase the master pseudo terminal as file descriptor PTY_FILENO. */ + if (fd != PTY_FILENO) + if (dup2 (fd, PTY_FILENO) < 0) + exit (FAIL_EBADF); + + execle (_PATH_PT_CHOWN, _PATH_PT_CHOWN, NULL, NULL); + exit (FAIL_EXEC); + } + else + { + int w; + + if (waitpid (pid, &w, 0) == -1) + goto cleanup; + if (!WIFEXITED (w)) + errno = ENOEXEC; + else + switch (WEXITSTATUS(w)) + { + case 0: + retval = 0; + break; + case FAIL_EBADF: + errno = EBADF; + break; + case FAIL_EINVAL: + errno = EINVAL; + break; + case FAIL_EACCES: + errno = EACCES; + break; + case FAIL_EXEC: + errno = ENOEXEC; + break; + + default: + assert(! "getpt: internal error: invalid exit code from pt_chown"); + } + } + + cleanup: + if (buf != _buf) + free (buf); + + return retval; +} diff --git a/libc/stdlib/unlockpt.c b/libc/stdlib/unlockpt.c new file mode 100644 index 000000000..5dfea15d7 --- /dev/null +++ b/libc/stdlib/unlockpt.c @@ -0,0 +1,49 @@ +/* Copyright (C) 1998 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <errno.h> +#include <stdlib.h> +#include <sys/ioctl.h> +#include <termios.h> + + +/* Unlock the slave pseudo terminal associated with the master pseudo + terminal specified by FD. */ +int +unlockpt (int fd) +{ +#ifdef TIOCSPTLCK + int save_errno = errno; + int unlock = 0; + + if (ioctl (fd, TIOCSPTLCK, &unlock)) + { + if (errno == EINVAL) + { + errno = save_errno; + return 0; + } + else + return -1; + } +#endif + /* If we have no TIOCSPTLCK ioctl, all slave pseudo terminals are + unlocked by default. */ + return 0; +} |