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process.c
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/**********************************************************************
process.c -
$Author$
$Date$
created at: Tue Aug 10 14:30:50 JST 1993
Copyright (C) 1993-2001 Yukihiro Matsumoto
Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
Copyright (C) 2000 Information-technology Promotion Agency, Japan
**********************************************************************/
#include "ruby.h"
#include "rubysig.h"
#include <stdio.h>
#include <errno.h>
#include <signal.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifndef NT
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#else
struct timeval {
long tv_sec; /* seconds */
long tv_usec; /* and microseconds */
};
#endif
#endif /* NT */
#include <ctype.h>
struct timeval rb_time_interval _((VALUE));
#ifdef HAVE_SYS_WAIT_H
# include <sys/wait.h>
#endif
#ifdef HAVE_GETPRIORITY
# include <sys/resource.h>
#endif
#ifdef HAVE_VFORK_H
#include <vfork.h>
#endif
#include "st.h"
#ifdef __EMX__
#undef HAVE_GETPGRP
#endif
static VALUE
get_pid()
{
return INT2FIX(getpid());
}
static VALUE
get_ppid()
{
#ifdef NT
return INT2FIX(0);
#else
return INT2FIX(getppid());
#endif
}
VALUE rb_last_status = Qnil;
#if !defined(HAVE_WAITPID) && !defined(HAVE_WAIT4)
#define NO_WAITPID
static st_table *pid_tbl;
#endif
static int
rb_waitpid(pid, flags, st)
int pid;
int flags;
int *st;
{
int result;
#ifndef NO_WAITPID
int oflags = flags;
if (!rb_thread_alone()) { /* there're other threads to run */
flags |= WNOHANG;
}
retry:
TRAP_BEG;
#ifdef HAVE_WAITPID
result = waitpid(pid, st, flags);
#else /* HAVE_WAIT4 */
result = wait4(pid, st, flags, NULL);
#endif
TRAP_END;
if (result < 0) {
if (errno == EINTR) {
rb_thread_polling();
goto retry;
}
return -1;
}
if (result == 0) {
if (oflags & WNOHANG) return 0;
rb_thread_polling();
if (rb_thread_alone()) flags = oflags;
goto retry;
}
#else /* NO_WAITPID */
if (pid_tbl && st_lookup(pid_tbl, pid, st)) {
rb_last_status = INT2FIX(*st);
st_delete(pid_tbl, &pid, NULL);
return pid;
}
if (flags) {
rb_raise(rb_eArgError, "can't do waitpid with flags");
}
for (;;) {
TRAP_BEG;
result = wait(st);
TRAP_END;
if (result < 0) {
if (errno == EINTR) {
rb_thread_schedule();
continue;
}
return -1;
}
if (result == pid) {
break;
}
if (!pid_tbl)
pid_tbl = st_init_numtable();
st_insert(pid_tbl, pid, st);
if (!rb_thread_alone()) rb_thread_schedule();
}
#endif
rb_last_status = INT2FIX(*st);
return result;
}
#ifdef NO_WAITPID
struct wait_data {
int pid;
int status;
};
static int
wait_each(key, value, data)
int key, value;
struct wait_data *data;
{
if (data->status != -1) return ST_STOP;
data->pid = key;
data->status = value;
return ST_DELETE;
}
#endif
static VALUE
proc_wait()
{
int pid, state;
#ifdef NO_WAITPID
struct wait_data data;
data.status = -1;
st_foreach(pid_tbl, wait_each, &data);
if (data.status != -1) {
rb_last_status = data.status;
return INT2FIX(data.pid);
}
while (1) {
TRAP_BEG;
pid = wait(&state);
TRAP_END;
if (pid >= 0) break;
if (errno == EINTR) {
rb_thread_schedule();
continue;
}
rb_sys_fail(0);
}
rb_last_status = INT2FIX(state);
#else
if ((pid = rb_waitpid(-1, 0, &state)) < 0)
rb_sys_fail(0);
#endif
return INT2FIX(pid);
}
static VALUE
proc_wait2()
{
VALUE pid = proc_wait();
return rb_assoc_new(pid, rb_last_status);
}
static VALUE
proc_waitpid(argc, argv)
int argc;
VALUE *argv;
{
VALUE vpid, vflags;
int pid, flags, status;
flags = 0;
rb_scan_args(argc, argv, "11", &vpid, &vflags);
if (argc == 2 && !NIL_P(vflags)) {
flags = NUM2UINT(vflags);
}
if ((pid = rb_waitpid(NUM2INT(vpid), flags, &status)) < 0)
rb_sys_fail(0);
if (pid == 0) {
rb_last_status = Qnil;
return Qnil;
}
return INT2FIX(pid);
}
static VALUE
proc_waitpid2(argc, argv)
int argc;
VALUE *argv;
{
VALUE pid = proc_waitpid(argc, argv);
if (NIL_P(pid)) return Qnil;
return rb_assoc_new(pid, rb_last_status);
}
#ifndef HAVE_STRING_H
char *strtok();
#endif
#ifdef HAVE_SETITIMER
#define before_exec() rb_thread_stop_timer()
#define after_exec() rb_thread_start_timer()
#else
#define before_exec()
#define after_exec()
#endif
extern char *dln_find_exe();
static void
security(str)
char *str;
{
if (rb_safe_level() > 0) {
if (rb_env_path_tainted()) {
rb_raise(rb_eSecurityError, "Insecure PATH - %s", str);
}
}
}
static int
proc_exec_v(argv, prog)
char **argv;
char *prog;
{
if (prog) {
security(prog);
}
else {
security(argv[0]);
prog = dln_find_exe(argv[0], 0);
if (!prog) {
errno = ENOENT;
return -1;
}
}
#if (defined(MSDOS) && !defined(DJGPP)) || defined(__human68k__) || defined(__EMX__) || defined(OS2)
{
#if defined(__human68k__)
#define COMMAND "command.x"
#endif
#if defined(__EMX__) || defined(OS2) /* OS/2 emx */
#define COMMAND "cmd.exe"
#endif
#if (defined(MSDOS) && !defined(DJGPP))
#define COMMAND "command.com"
#endif
char *extension;
if ((extension = strrchr(prog, '.')) != NULL && strcasecmp(extension, ".bat") == 0) {
char **new_argv;
char *p;
int n;
for (n = 0; argv[n]; n++)
/* no-op */;
new_argv = ALLOCA_N(char*, n + 2);
for (; n > 0; n--)
new_argv[n + 1] = argv[n];
new_argv[1] = strcpy(ALLOCA_N(char, strlen(argv[0]) + 1), argv[0]);
for (p = new_argv[1]; *p != '\0'; p++)
if (*p == '/')
*p = '\\';
new_argv[0] = COMMAND;
argv = new_argv;
prog = dln_find_exe(argv[0], 0);
if (!prog) {
errno = ENOENT;
return -1;
}
}
}
#endif /* MSDOS or __human68k__ or __EMX__ */
before_exec();
execv(prog, argv);
after_exec();
return -1;
}
static int
proc_exec_n(argc, argv, progv)
int argc;
VALUE *argv;
VALUE progv;
{
char *prog = 0;
char **args;
int i;
if (progv) {
prog = RSTRING(progv)->ptr;
}
args = ALLOCA_N(char*, argc+1);
for (i=0; i<argc; i++) {
args[i] = RSTRING(argv[i])->ptr;
}
args[i] = 0;
if (args[0]) {
return proc_exec_v(args, prog);
}
return -1;
}
int
rb_proc_exec(str)
const char *str;
{
const char *s = str;
char *ss, *t;
char **argv, **a;
security(str);
for (s=str; *s; s++) {
if (*s != ' ' && !ISALPHA(*s) && strchr("*?{}[]<>()~&|\\$;'`\"\n",*s)) {
#if defined(MSDOS)
int state;
before_exec();
state = system(str);
after_exec();
if (state != -1)
exit(state);
#else
#if defined(__human68k__) || defined(__CYGWIN32__) || defined(__EMX__)
char *shell = dln_find_exe("sh", 0);
int state = -1;
before_exec();
if (shell)
execl(shell, "sh", "-c", str, (char *) NULL);
else
state = system(str);
after_exec();
if (state != -1)
exit(state);
#else
before_exec();
execl("/bin/sh", "sh", "-c", str, (char *)NULL);
after_exec();
#endif
#endif
return -1;
}
}
a = argv = ALLOCA_N(char*, (s-str)/2+2);
ss = ALLOCA_N(char, s-str+1);
strcpy(ss, str);
if (*a++ = strtok(ss, " \t")) {
while (t = strtok(NULL, " \t")) {
*a++ = t;
}
*a = NULL;
}
if (argv[0]) {
return proc_exec_v(argv, 0);
}
errno = ENOENT;
return -1;
}
#if defined(__human68k__)
static int
proc_spawn_v(argv, prog)
char **argv;
char *prog;
{
char *extension;
int state;
if (prog) {
security(prog);
}
else {
security(argv[0]);
prog = dln_find_exe(argv[0], 0);
if (!prog)
return -1;
}
if ((extension = strrchr(prog, '.')) != NULL && strcasecmp(extension, ".bat") == 0) {
char **new_argv;
char *p;
int n;
for (n = 0; argv[n]; n++)
/* no-op */;
new_argv = ALLOCA_N(char*, n + 2);
for (; n > 0; n--)
new_argv[n + 1] = argv[n];
new_argv[1] = strcpy(ALLOCA_N(char, strlen(argv[0]) + 1), argv[0]);
for (p = new_argv[1]; *p != '\0'; p++)
if (*p == '/')
*p = '\\';
new_argv[0] = COMMAND;
argv = new_argv;
prog = dln_find_exe(argv[0], 0);
if (!prog) {
errno = ENOENT;
return -1;
}
}
before_exec();
state = spawnv(P_WAIT, prog, argv);
after_exec();
return state;
}
static int
proc_spawn_n(argc, argv, prog)
int argc;
VALUE *argv;
VALUE prog;
{
char **args;
int i;
args = ALLOCA_N(char*, argc + 1);
for (i = 0; i < argc; i++) {
Check_SafeStr(argv[i]);
args[i] = RSTRING(argv[i])->ptr;
}
Check_SafeStr(prog);
args[i] = (char*) 0;
if (args[0])
return proc_spawn_v(args, RSTRING(prog)->ptr);
return -1;
}
static int
proc_spawn(sv)
VALUE sv;
{
char *str;
char *s, *t;
char **argv, **a;
int state;
Check_SafeStr(sv);
str = s = RSTRING(sv)->ptr;
for (s = str; *s; s++) {
if (*s != ' ' && !ISALPHA(*s) && strchr("*?{}[]<>()~&|\\$;'`\"\n",*s)) {
char *shell = dln_find_exe("sh", 0);
before_exec();
state = shell?spawnl(P_WAIT,shell,"sh","-c",str,(char*)NULL):system(str);
after_exec();
return state;
}
}
a = argv = ALLOCA_N(char*, (s - str) / 2 + 2);
s = ALLOCA_N(char, s - str + 1);
strcpy(s, str);
if (*a++ = strtok(s, " \t")) {
while (t = strtok(NULL, " \t"))
*a++ = t;
*a = NULL;
}
return argv[0] ? proc_spawn_v(argv, 0) : -1;
}
#endif /* __human68k__ */
static VALUE
rb_f_exec(argc, argv)
int argc;
VALUE *argv;
{
VALUE prog = 0;
int i;
if (argc == 0) {
rb_raise(rb_eArgError, "wrong # of arguments");
}
if (TYPE(argv[0]) == T_ARRAY) {
if (RARRAY(argv[0])->len != 2) {
rb_raise(rb_eArgError, "wrong first argument");
}
prog = RARRAY(argv[0])->ptr[0];
argv[0] = RARRAY(argv[0])->ptr[1];
}
if (prog) {
Check_SafeStr(prog);
}
for (i = 0; i < argc; i++) {
Check_SafeStr(argv[i]);
}
if (argc == 1 && prog == 0) {
rb_proc_exec(RSTRING(argv[0])->ptr);
}
else {
proc_exec_n(argc, argv, prog);
}
rb_sys_fail(RSTRING(argv[0])->ptr);
return Qnil; /* dummy */
}
static VALUE
rb_f_fork(obj)
VALUE obj;
{
#if !defined(__human68k__) && !defined(NT) && !defined(__MACOS__) && !defined(__EMX__)
int pid;
rb_secure(2);
switch (pid = fork()) {
case 0:
#ifdef linux
after_exec();
#endif
rb_thread_atfork();
if (rb_block_given_p()) {
int status;
rb_protect(rb_yield, Qnil, &status);
ruby_stop(status);
}
return Qnil;
case -1:
rb_sys_fail("fork(2)");
return Qnil;
default:
return INT2FIX(pid);
}
#else
rb_notimplement();
#endif
}
static VALUE
rb_f_exit_bang(argc, argv, obj)
int argc;
VALUE *argv;
VALUE obj;
{
VALUE status;
int istatus;
rb_secure(4);
if (rb_scan_args(argc, argv, "01", &status) == 1) {
istatus = NUM2INT(status);
}
else {
istatus = -1;
}
_exit(istatus);
return Qnil; /* not reached */
}
void
rb_syswait(pid)
int pid;
{
RETSIGTYPE (*hfunc)_((int)), (*qfunc)_((int)), (*ifunc)_((int));
int status;
int i;
#ifdef SIGHUP
hfunc = signal(SIGHUP, SIG_IGN);
#endif
#ifdef SIGQUIT
qfunc = signal(SIGQUIT, SIG_IGN);
#endif
ifunc = signal(SIGINT, SIG_IGN);
do {
i = rb_waitpid(pid, 0, &status);
} while (i == -1 && errno == EINTR);
#ifdef SIGHUP
signal(SIGHUP, hfunc);
#endif
#ifdef SIGQUIT
signal(SIGQUIT, qfunc);
#endif
signal(SIGINT, ifunc);
}
static VALUE
rb_f_system(argc, argv)
int argc;
VALUE *argv;
{
#if defined(NT) || defined(__EMX__)
VALUE cmd;
int state;
fflush(stdout);
fflush(stderr);
if (argc == 0) {
rb_last_status = INT2FIX(0);
rb_raise(rb_eArgError, "wrong # of arguments");
}
if (TYPE(argv[0]) == T_ARRAY) {
if (RARRAY(argv[0])->len != 2) {
rb_raise(rb_eArgError, "wrong first argument");
}
argv[0] = RARRAY(argv[0])->ptr[0];
}
cmd = rb_ary_join(rb_ary_new4(argc, argv), rb_str_new2(" "));
Check_SafeStr(cmd);
state = do_spawn(RSTRING(cmd)->ptr);
rb_last_status = INT2FIX(state);
if (state == 0) return Qtrue;
return Qfalse;
#else
#ifdef DJGPP
VALUE cmd;
int state;
if (argc == 0) {
rb_last_status = INT2FIX(0);
rb_raise(rb_eArgError, "wrong # of arguments");
}
if (TYPE(argv[0]) == T_ARRAY) {
if (RARRAY(argv[0])->len != 2) {
rb_raise(rb_eArgError, "wrong first argument");
}
argv[0] = RARRAY(argv[0])->ptr[0];
}
cmd = rb_ary_join(rb_ary_new4(argc, argv), rb_str_new2(" "));
Check_SafeStr(cmd);
state = system(RSTRING(cmd)->ptr);
rb_last_status = INT2FIX((state & 0xff) << 8);
if (state == 0) return Qtrue;
return Qfalse;
#else
#if defined(__human68k__)
VALUE prog = 0;
int i;
int state;
fflush(stdin);
fflush(stdout);
fflush(stderr);
if (argc == 0) {
rb_last_status = INT2FIX(0);
rb_raise(rb_eArgError, "wrong # of arguments");
}
if (TYPE(argv[0]) == T_ARRAY) {
if (RARRAY(argv[0])->len != 2) {
rb_raise(rb_eArgError, "wrong first argument");
}
prog = RARRAY(argv[0])->ptr[0];
argv[0] = RARRAY(argv[0])->ptr[1];
}
if (argc == 1 && prog == 0) {
state = proc_spawn(argv[0]);
}
else {
state = proc_spawn_n(argc, argv, prog);
}
rb_last_status = state == -1 ? INT2FIX(127) : INT2FIX(state);
return state == 0 ? Qtrue : Qfalse;
#else
volatile VALUE prog = 0;
int pid;
int i;
fflush(stdout);
fflush(stderr);
if (argc == 0) {
rb_last_status = INT2FIX(0);
rb_raise(rb_eArgError, "wrong # of arguments");
}
if (TYPE(argv[0]) == T_ARRAY) {
if (RARRAY(argv[0])->len != 2) {
rb_raise(rb_eArgError, "wrong first argument");
}
prog = RARRAY(argv[0])->ptr[0];
argv[0] = RARRAY(argv[0])->ptr[1];
}
if (prog) {
Check_SafeStr(prog);
}
for (i = 0; i < argc; i++) {
Check_SafeStr(argv[i]);
}
retry:
switch (pid = vfork()) {
case 0:
if (argc == 1 && prog == 0) {
rb_proc_exec(RSTRING(argv[0])->ptr);
}
else {
proc_exec_n(argc, argv, prog);
}
_exit(127);
break; /* not reached */
case -1:
if (errno == EAGAIN) {
rb_thread_sleep(1);
goto retry;
}
rb_sys_fail(0);
break;
default:
rb_syswait(pid);
}
if (rb_last_status == INT2FIX(0)) return Qtrue;
return Qfalse;
#endif /* __human68k__ */
#endif /* DJGPP */
#endif /* NT */
}
static VALUE
rb_f_sleep(argc, argv)
int argc;
VALUE *argv;
{
int beg, end;
beg = time(0);
if (argc == 0) {
rb_thread_sleep_forever();
}
else if (argc == 1) {
rb_thread_wait_for(rb_time_interval(argv[0]));
}
else {
rb_raise(rb_eArgError, "wrong # of arguments");
}
end = time(0) - beg;
return INT2FIX(end);
}
static VALUE
proc_getpgrp(argc, argv)
int argc;
VALUE *argv;
{
#ifdef HAVE_GETPGRP
int pgrp;
#ifndef GETPGRP_VOID
VALUE vpid;
int pid;
rb_scan_args(argc, argv, "01", &vpid);
pid = NIL_P(vpid)?0:NUM2INT(vpid);
pgrp = getpgrp(pid);
#else
rb_scan_args(argc, argv, "0");
pgrp = getpgrp();
#endif
if (pgrp < 0) rb_sys_fail(0);
return INT2FIX(pgrp);
#else
rb_notimplement();
#endif
}
static VALUE
proc_setpgrp(argc, argv)
int argc;
VALUE *argv;
{
#ifdef HAVE_SETPGRP
#ifndef SETPGRP_VOID
VALUE pid, pgrp;
int ipid, ipgrp;
rb_scan_args(argc, argv, "02", &pid, &pgrp);
ipid = NIL_P(pid)?0:NUM2INT(pid);
ipgrp = NIL_P(pgrp)?0:NUM2INT(pgrp);
if (setpgrp(ipid, ipgrp) < 0) rb_sys_fail(0);
#else
rb_scan_args(argc, argv, "0");
if (setpgrp() < 0) rb_sys_fail(0);
#endif
return INT2FIX(0);
#else
rb_notimplement();
#endif
}
static VALUE
proc_getpgid(obj, pid)
VALUE obj, pid;
{
#if defined(HAVE_GETPGID) && !defined(__CHECKER__)
int i;
i = getpgid(NUM2INT(pid));
return INT2NUM(i);
#else
rb_notimplement();
#endif
}
static VALUE
proc_setpgid(obj, pid, pgrp)
VALUE obj, pid, pgrp;
{
#ifdef HAVE_SETPGID
int ipid, ipgrp;
rb_secure(2);
ipid = NUM2INT(pid);
ipgrp = NUM2INT(pgrp);
if (setpgid(ipid, ipgrp) < 0) rb_sys_fail(0);
return INT2FIX(0);
#else
rb_notimplement();
#endif
}
static VALUE
proc_setsid()
{
#if defined(HAVE_SETSID)
int pid;
rb_secure(2);
pid = setsid();
if (pid < 0) rb_sys_fail(0);
return INT2FIX(pid);
#elif defined(HAVE_SETPGRP) && defined(TIOCNOTTY)
pid_t pid;
int ret;
rb_secure(2);
pid = getpid();
#if defined(SETPGRP_VOID)
ret = setpgrp();
/* If `pid_t setpgrp(void)' is equivalent to setsid(),
`ret' will be the same value as `pid', and following open() will fail.
In Linux, `int setpgrp(void)' is equivalent to setpgid(0, 0). */
#else
ret = setpgrp(0, pid);
#endif
if (ret == -1) rb_sys_fail(0);
if ((fd = open("/dev/tty", O_RDWR)) >= 0) {
ioctl(fd, TIOCNOTTY, NULL);
close(fd);
}
return INT2FIX(pid);
#else
rb_notimplement();
#endif
}
static VALUE
proc_getpriority(obj, which, who)
VALUE obj, which, who;
{
#ifdef HAVE_GETPRIORITY
int prio, iwhich, iwho;
iwhich = NUM2INT(which);
iwho = NUM2INT(who);
errno = 0;
prio = getpriority(iwhich, iwho);
if (errno) rb_sys_fail(0);
return INT2FIX(prio);
#else
rb_notimplement();
#endif
}
static VALUE
proc_setpriority(obj, which, who, prio)
VALUE obj, which, who, prio;
{
#ifdef HAVE_GETPRIORITY
int iwhich, iwho, iprio;
rb_secure(2);
iwhich = NUM2INT(which);
iwho = NUM2INT(who);
iprio = NUM2INT(prio);
if (setpriority(iwhich, iwho, iprio) < 0)
rb_sys_fail(0);
return INT2FIX(0);
#else
rb_notimplement();
#endif
}
static VALUE
proc_getuid(obj)
VALUE obj;
{
int uid = getuid();
return INT2FIX(uid);
}
static VALUE
proc_setuid(obj, id)
VALUE obj, id;
{
int uid;
uid = NUM2INT(id);
#if defined(HAVE_SETRESUID) && !defined(__CHECKER__)
setresuid(uid, -1, -1);
#elif defined HAVE_SETREUID
setreuid(uid, -1);
#elif defined HAVE_SETRUID
setruid(uid);
#else
{
if (geteuid() == uid)
setuid(uid);
else
rb_notimplement();
}
#endif
return INT2FIX(uid);
}
static VALUE
proc_getgid(obj)
VALUE obj;
{
int gid = getgid();
return INT2FIX(gid);
}
static VALUE
proc_setgid(obj, id)
VALUE obj, id;
{
int gid;
gid = NUM2INT(id);
#if defined(HAVE_SETRESGID) && !defined(__CHECKER__)
setresgid(gid, -1, -1);
#elif defined HAVE_SETREGID
setregid(gid, -1);
#elif defined HAS_SETRGID
setrgid((GIDTYPE)gid);
#else
{
if (getegid() == gid)
setgid(gid);
else
rb_notimplement();
}
#endif