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ruby--ruby/ext/pty/pty.c

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#include "config.h"
#include <stdio.h>
#include <sys/types.h>
#include <sys/file.h>
#include <fcntl.h>
#include <errno.h>
#include <pwd.h>
#if !defined(HAVE_OPENPTY) && !defined(HAVE__GETPTY)
#include <sys/ioctl.h>
#endif
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#else
#define WIFSTOPPED(status) (((status) & 0xff) == 0x7f)
#endif
#include <ctype.h>
#include "ruby.h"
#include "rubyio.h"
#include <signal.h>
#ifdef HAVE_SYS_STROPTS_H
#include <sys/stropts.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#define DEVICELEN 16
#if !defined(HAVE_OPENPTY)
#ifdef __hpux
char *MasterDevice = "/dev/ptym/pty%s",
*SlaveDevice = "/dev/pty/tty%s",
*deviceNo[] = {
"p0","p1","p2","p3","p4","p5","p6","p7",
"p8","p9","pa","pb","pc","pd","pe","pf",
"q0","q1","q2","q3","q4","q5","q6","q7",
"q8","q9","qa","qb","qc","qd","qe","qf",
"r0","r1","r2","r3","r4","r5","r6","r7",
"r8","r9","ra","rb","rc","rd","re","rf",
"s0","s1","s2","s3","s4","s5","s6","s7",
"s8","s9","sa","sb","sc","sd","se","sf",
"t0","t1","t2","t3","t4","t5","t6","t7",
"t8","t9","ta","tb","tc","td","te","tf",
"u0","u1","u2","u3","u4","u5","u6","u7",
"u8","u9","ua","ub","uc","ud","ue","uf",
"v0","v1","v2","v3","v4","v5","v6","v7",
"v8","v9","va","vb","vc","vd","ve","vf",
"w0","w1","w2","w3","w4","w5","w6","w7",
"w8","w9","wa","wb","wc","wd","we","wf",
0,
};
#else /* NOT HPUX */
#ifdef _IBMESA /* AIX/ESA */
char *MasterDevice = "/dev/ptyp%s",
*SlaveDevice = "/dev/ttyp%s",
*deviceNo[] = {
"00","01","02","03","04","05","06","07","08","09","0a","0b","0c","0d","0e","0f",
"10","11","12","13","14","15","16","17","18","19","1a","1b","1c","1d","1e","1f",
"20","21","22","23","24","25","26","27","28","29","2a","2b","2c","2d","2e","2f",
"30","31","32","33","34","35","36","37","38","39","3a","3b","3c","3d","3e","3f",
"40","41","42","43","44","45","46","47","48","49","4a","4b","4c","4d","4e","4f",
"50","51","52","53","54","55","56","57","58","59","5a","5b","5c","5d","5e","5f",
"60","61","62","63","64","65","66","67","68","69","6a","6b","6c","6d","6e","6f",
"70","71","72","73","74","75","76","77","78","79","7a","7b","7c","7d","7e","7f",
"80","81","82","83","84","85","86","87","88","89","8a","8b","8c","8d","8e","8f",
"90","91","92","93","94","95","96","97","98","99","9a","9b","9c","9d","9e","9f",
"a0","a1","a2","a3","a4","a5","a6","a7","a8","a9","aa","ab","ac","ad","ae","af",
"b0","b1","b2","b3","b4","b5","b6","b7","b8","b9","ba","bb","bc","bd","be","bf",
"c0","c1","c2","c3","c4","c5","c6","c7","c8","c9","ca","cb","cc","cd","ce","cf",
"d0","d1","d2","d3","d4","d5","d6","d7","d8","d9","da","db","dc","dd","de","df",
"e0","e1","e2","e3","e4","e5","e6","e7","e8","e9","ea","eb","ec","ed","ee","ef",
"f0","f1","f2","f3","f4","f5","f6","f7","f8","f9","fa","fb","fc","fd","fe","ff",
};
#else
char *MasterDevice = "/dev/pty%s",
*SlaveDevice = "/dev/tty%s",
*deviceNo[] = {
"p0","p1","p2","p3","p4","p5","p6","p7",
"p8","p9","pa","pb","pc","pd","pe","pf",
"q0","q1","q2","q3","q4","q5","q6","q7",
"q8","q9","qa","qb","qc","qd","qe","qf",
"r0","r1","r2","r3","r4","r5","r6","r7",
"r8","r9","ra","rb","rc","rd","re","rf",
0,
};
#endif /* _IBMESA */
#endif /* HPUX */
#endif /* !defined(HAVE_OPENPTY) */
char SlaveName[DEVICELEN];
extern int errno;
#define MAX_PTY 16
static int n_pty,last_pty;
static int chld_pid[MAX_PTY];
#ifndef HAVE_SETEUID
# ifdef HAVE_SETREUID
# define seteuid(e) setreuid(-1, (e))
# else /* NOT HAVE_SETREUID */
# ifdef HAVE_SETRESUID
# define seteuid(e) setresuid(-1, (e), -1)
# else /* NOT HAVE_SETRESUID */
/* I can't set euid. (;_;) */
# endif /* HAVE_SETRESUID */
# endif /* HAVE_SETREUID */
#endif /* NO_SETEUID */
struct pty_info {
int fd;
pid_t child_pid;
};
static void
set_signal_action(action)
RETSIGTYPE (*action)();
{
#ifdef __hpux
struct sigvec sv;
/*
* signal SIGCHLD should be delivered on stop of the child
*/
sv.sv_handler = action;
sv.sv_mask = sigmask(SIGCHLD);
sv.sv_flags = SV_BSDSIG;
sigvector(SIGCHLD, &sv, (struct sigvec *) 0);
#else /* not HPUX */
#if defined(SA_NOCLDSTOP)
struct sigaction sa;
/*
* signal SIGCHLD should be delivered on stop of the child
* (for SVR4)
*/
sa.sa_handler = action;
sigemptyset(&sa.sa_mask);
sigaddset(&sa.sa_mask, SIGCHLD);
sa.sa_flags = 0; /* SA_NOCLDSTOP flag is removed */
sigaction(SIGCHLD, &sa, (struct sigaction *) 0);
#else
signal(SIGCHLD,action);
#endif
#endif /* not HPUX */
}
static void
reset_signal_action()
{
set_signal_action(SIG_DFL);
}
static RETSIGTYPE
chld_changed()
{
int cpid;
int i,n = -1;
int statusp;
for (;;) {
#ifdef HAVE_WAITPID
cpid = waitpid(-1, &statusp, WUNTRACED|WNOHANG);
#else
cpid = wait3(&statusp, WUNTRACED|WNOHANG, 0);
#endif
if (cpid == 0 || cpid == -1)
return;
for (i = 0; i < last_pty; i++) {
if (chld_pid[i] == cpid) {
n = i;
goto catched;
}
}
rb_raise(rb_eRuntimeError, "fork: %d", cpid);
}
catched:
#ifdef IF_STOPPED
if (IF_STOPPED(statusp)) { /* suspend */
rb_raise(rb_eRuntimeError, "Stopped: %d",cpid);
}
#else
#ifdef WIFSTOPPED
if (WIFSTOPPED(statusp)) { /* suspend */
rb_raise(rb_eRuntimeError, "Stopped: %d",cpid);
}
#else
---->> Either IF_STOPPED or WIFSTOPPED is needed <<----
#endif /* WIFSTOPPED */
#endif /* IF_STOPPED */
if (n >= 0) {
chld_pid[n] = 0;
n_pty--;
if (n_pty == 0)
reset_signal_action();
}
rb_raise(rb_eRuntimeError, "Child_changed: %d",cpid);
}
static void getDevice _((int*, int*));
static void
establishShell(shellname, info)
char *shellname;
struct pty_info *info;
{
static int i,j,master,slave,currentPid;
char *p,*getenv();
struct passwd *pwent;
RETSIGTYPE chld_changed();
if (shellname[0] == '\0') {
if ((p = getenv("SHELL")) != NULL) {
shellname = p;
}
else {
pwent = getpwuid(getuid());
if (pwent && pwent->pw_shell)
shellname = pwent->pw_shell;
else
shellname = "/bin/sh";
}
}
getDevice(&master,&slave);
currentPid = getpid();
set_signal_action(chld_changed);
if((i = vfork()) < 0) {
rb_sys_fail("fork failed");
}
if(i == 0) { /* child */
int argc;
char *argv[1024];
currentPid = getpid();
/*
* Set free from process group and controlling terminal
*/
#ifdef HAVE_SETSID
(void) setsid();
#else /* HAS_SETSID */
# ifdef HAVE_SETPGRP
# ifdef SETGRP_VOID
if (setpgrp() == -1)
perror("setpgrp()");
# else /* SETGRP_VOID */
if (setpgrp(0, currentPid) == -1)
rb_sys_fail("setpgrp()");
if ((i = open("/dev/tty", O_RDONLY)) < 0)
rb_sys_fail("/dev/tty");
else {
if (ioctl(i, TIOCNOTTY, (char *)0))
perror("ioctl(TIOCNOTTY)");
close(i);
}
# endif /* SETGRP_VOID */
# endif /* HAVE_SETPGRP */
#endif /* HAS_SETSID */
/*
* obtain new controlling terminal
*/
#if defined(TIOCSCTTY)
close(master);
(void) ioctl(slave, TIOCSCTTY, (char *)0);
/* errors ignored for sun */
#else
close(slave);
slave = open(SlaveName, O_RDWR);
if (slave < 0) {
perror("open: pty slave");
_exit(1);
}
close(master);
#endif
dup2(slave,0);
dup2(slave,1);
dup2(slave,2);
close(slave);
#if defined(HAVE_SETEUID) || defined(HAVE_SETREUID) || defined(HAVE_SETRESUID)
seteuid(getuid());
#endif
argc = 0;
for (i = 0; shellname[i];) {
while (isspace(shellname[i])) i++;
for (j = i; shellname[j] && !isspace(shellname[j]); j++);
argv[argc] = (char*)xmalloc(j-i+1);
strncpy(argv[argc],&shellname[i],j-i);
argv[argc][j-i] = 0;
i = j;
argc++;
}
argv[argc] = NULL;
execvp(argv[0],argv);
sleep(1);
_exit(1);
}
close(slave);
if (n_pty == last_pty) {
chld_pid[n_pty] = i;
n_pty++;
last_pty++;
}
else {
for (j = 0; j < last_pty; j++) {
if (chld_pid[j] == 0) {
chld_pid[j] = i;
n_pty++;
}
}
}
info->child_pid = i;
info->fd = master;
}
#ifdef HAVE_OPENPTY
/*
* Use openpty(3) of 4.3BSD Reno and later,
* or the same interface function.
*/
static void
getDevice(master,slave)
int *master,*slave;
{
if (openpty(master, slave, SlaveName,
(struct termios *)0, (struct winsize *)0) == -1) {
rb_raise(rb_eRuntimeError, "openpty() failed");
}
}
#else /* HAVE_OPENPTY */
#ifdef HAVE__GETPTY
static void
getDevice(master,slave)
int *master,*slave;
{
char *name;
if (!(name = _getpty(master, O_RDWR, 0622, 0))) {
rb_raise(rb_eRuntimeError, "_getpty() failed");
}
*slave = open(name, O_RDWR);
strcpy(SlaveName, name);
}
#else /* HAVE__GETPTY */
static void
getDevice(master,slave)
int *master,*slave;
{
char **p;
int i,j;
char MasterName[DEVICELEN];
#ifdef HAVE_DEV_PTMX
char *pn;
void (*s)();
extern char *ptsname(int);
extern int unlockpt(int);
extern int grantpt(int);
if((i = open("/dev/ptmx", O_RDWR, 0)) != -1) {
s = signal(SIGCHLD, SIG_DFL);
if(grantpt(i) != -1) {
signal(SIGCHLD, s);
if(unlockpt(i) != -1) {
if((pn = ptsname(i)) != NULL) {
if((j = open(pn, O_RDWR, 0)) != -1) {
#if defined I_PUSH
if(ioctl(j, I_PUSH, "ptem") != -1) {
if(ioctl(j, I_PUSH, "ldterm") != -1) {
#endif
*master = i;
*slave = j;
strcpy(SlaveName, pn);
return;
#if defined I_PUSH
}
}
#endif
}
}
}
}
close(i);
}
rb_raise(rb_eRuntimeError, "Cannot get Master/Slave device");
#else
for (p = deviceNo; *p != NULL; p++) {
sprintf(MasterName ,MasterDevice,*p);
if ((i = open(MasterName,O_RDWR,0)) >= 0) {
*master = i;
sprintf(SlaveName ,SlaveDevice,*p);
if ((j = open(SlaveName,O_RDWR,0)) >= 0) {
*slave = j;
chown(SlaveName, getuid(), getgid());
chmod(SlaveName, 0622);
return;
}
close(i);
}
}
rb_raise(rb_eRuntimeError, "Cannot get %s\n", SlaveDevice);
#endif
}
#endif /* HAVE__GETPTY */
#endif /* HAVE_OPENPTY */
static void
freeDevice()
{
chmod(SlaveName, 0666);
chown(SlaveName, 0, 0);
}
/* ruby function: getpty */
static VALUE
pty_getpty(self, shell)
VALUE self, shell;
{
VALUE res;
struct pty_info info;
OpenFile *wfptr,*rfptr;
NEWOBJ(rport, struct RFile);
NEWOBJ(wport, struct RFile);
if (n_pty == MAX_PTY+1) {
rb_raise(rb_eRuntimeError, "Too many ptys are open");
}
OBJSETUP(rport, rb_cFile, T_FILE);
MakeOpenFile(rport, rfptr);
OBJSETUP(wport, rb_cFile, T_FILE);
MakeOpenFile(wport, wfptr);
establishShell(RSTRING(shell)->ptr,&info);
rfptr->mode = rb_io_mode_flags("r");
rfptr->f = fdopen(info.fd, "r");
rfptr->path = strdup(RSTRING(shell)->ptr);
wfptr->mode = rb_io_mode_flags("w");
wfptr->f = fdopen(dup(info.fd), "w");
wfptr->path = strdup(RSTRING(shell)->ptr);
res = rb_ary_new2(2);
rb_ary_store(res,0,(VALUE)rport);
rb_ary_store(res,1,(VALUE)wport);
rb_ary_store(res,2,INT2FIX(info.child_pid));
if (rb_block_given_p()) {
rb_yield((VALUE)res);
reset_signal_action();
return Qnil;
}
else {
return (VALUE)res;
}
}
/* ruby function: protect_signal */
static VALUE
pty_protect(self)
VALUE self;
{
reset_signal_action();
rb_yield(Qnil);
set_signal_action(chld_changed);
return self;
}
static VALUE
pty_reset_signal(self)
VALUE self;
{
reset_signal_action();
return self;
}
static VALUE cPTY;
void
Init_pty()
{
cPTY = rb_define_module("PTY");
rb_define_module_function(cPTY,"getpty",pty_getpty,1);
rb_define_module_function(cPTY,"spawn",pty_getpty,1);
rb_define_module_function(cPTY,"protect_signal",pty_protect,0);
rb_define_module_function(cPTY,"reset_signal",pty_reset_signal,0);
}
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