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process.c
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/* Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: [email protected]
WWW: http://www.swi-prolog.org
Copyright (c) 2000-2025, University of Amsterdam
VU University Amsterdam
CWI, Amsterdam
SWI-Prolog Solutions b.v.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. 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.
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.
*/
#include <config.h>
#define _CRT_SECURE_NO_WARNINGS 1
#define SWIPL_WINDOWS_NATIVE_ACCESS 1
/*#define O_DEBUG 1*/
#undef O_DEBUG
#define _GNU_SOURCE /* get pipe2() */
#include <SWI-Prolog.h>
#include <SWI-Stream.h>
#include "error.h"
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <signal.h>
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_PRCTL
#include <sys/prctl.h>
#endif
#ifdef _REENTRANT
#include <pthread.h>
#endif
#ifdef HAVE_CRT_EXTERNS_H
#include <crt_externs.h> /* _NSGetEnviron() on MacOS */
#endif
static atom_t ATOM_stdin;
static atom_t ATOM_stdout;
static atom_t ATOM_stderr;
static atom_t ATOM_std;
static atom_t ATOM_null;
static atom_t ATOM_process;
static atom_t ATOM_detached;
static atom_t ATOM_cwd;
static atom_t ATOM_env;
static atom_t ATOM_environment;
static atom_t ATOM_priority;
static atom_t ATOM_window;
static atom_t ATOM_timeout;
static atom_t ATOM_release;
static atom_t ATOM_infinite;
static atom_t ATOM_text;
static atom_t ATOM_binary;
static atom_t ATOM_octet;
static atom_t ATOM_utf8;
static atom_t ATOM_ascii;
static atom_t ATOM_iso_latin_1;
static atom_t ATOM_unicode_be;
static atom_t ATOM_unicode_le;
static functor_t FUNCTOR_error2;
static functor_t FUNCTOR_process_error2;
static functor_t FUNCTOR_system_error2;
static functor_t FUNCTOR_pipe1;
static functor_t FUNCTOR_pipe2;
static functor_t FUNCTOR_stream1;
static functor_t FUNCTOR_exit1;
static functor_t FUNCTOR_killed1;
static functor_t FUNCTOR_eq2; /* =/2 */
static functor_t FUNCTOR_type1;
static functor_t FUNCTOR_encoding1;
#define MAYBE 2
#if O_DEBUG
#define DEBUG(g) g
#else
#define DEBUG(g) (void)0
#endif
#ifdef __WINDOWS__
#include <windows.h>
#include <stdio.h>
#include <fcntl.h>
#include <io.h>
typedef wchar_t echar; /* environment character */
#define ecslen(s) wcslen(s)
#ifndef CREATE_BREAKAWAY_FROM_JOB
#define CREATE_BREAKAWAY_FROM_JOB 0x1000000
#endif
#else
typedef char echar;
#define ecslen(s) strlen(s)
#endif
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
ISSUES:
- Deal with child errors (no cwd, cannot execute, etc.)
- Complete test suite
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
/*******************************
* ADMIN *
*******************************/
typedef enum std_type
{ std_std,
std_null,
std_pipe,
std_stream
} std_type;
typedef struct p_stream
{ term_t term; /* P in pipe(P) */
std_type type; /* type of stream */
IOENC encoding; /* Encoding for the stream */
#ifdef __WINDOWS__
HANDLE fd[2]; /* pipe handles */
#else
int fd[2]; /* pipe handles */
#endif
int cloexec; /* close on exec activated */
} p_stream;
typedef struct ecbuf
{ echar *buffer;
size_t size;
size_t allocated;
} ecbuf;
typedef struct p_options
{ atom_t exe_name; /* exe as atom */
#ifdef __WINDOWS__
wchar_t *exe; /* Executable */
wchar_t *cmdline; /* Command line */
wchar_t *cwd; /* CWD of new process */
#else
char *exe; /* Executable */
char **argv; /* argument vector */
char *cwd; /* CWD of new process */
char **envp; /* New environment */
#endif
ecbuf envbuf; /* environment buffer */
term_t pid; /* process(PID) */
int pipes; /* #pipes found */
p_stream streams[3];
int detached; /* create as detached */
int window; /* Show a window? */
int priority; /* Process priority */
} p_options;
typedef struct wait_options
{ double timeout;
int has_timeout;
int release;
} wait_options;
typedef enum create_method
{ PCREATE_SPAWN,
PCREATE_VFORK,
PCREATE_FORK
} create_method;
static create_method create_process_method = PCREATE_SPAWN;
#ifdef __WINDOWS__
static int win_command_line(term_t t, size_t arity,
const wchar_t *exepath, wchar_t **cmdline);
#endif
/*******************************
* STRING BUFFER *
*******************************/
static void
free_ecbuf(ecbuf *b)
{ if ( b->buffer )
{ PL_free(b->buffer);
b->buffer = NULL;
}
}
static int
add_ecbuf(ecbuf *b, echar *data, size_t len)
{ if ( b->size + len > b->allocated )
{ size_t newsize = (b->allocated ? b->allocated * 2 : 2048);
while( b->size + len > newsize )
newsize *= 2;
if ( b->buffer )
{ b->buffer = PL_realloc(b->buffer, newsize*sizeof(echar));
} else
{ b->buffer = PL_malloc(newsize*sizeof(echar));
}
b->allocated = newsize;
}
memcpy(b->buffer+b->size, data, len*sizeof(echar));
b->size += len;
return TRUE;
}
/*******************************
* ENVIRONMENT PARSING *
*******************************/
static int
get_echars_arg_ex(int i, term_t from, term_t arg, echar **sp, size_t *lenp)
{ const echar *s, *e;
if ( !PL_get_arg(i, from, arg) )
return FALSE;
#ifdef __WINDOWS__
if ( !PL_get_wchars(arg, lenp, sp,
CVT_ATOMIC|CVT_EXCEPTION) )
#else
if ( !PL_get_nchars(arg, lenp, sp,
CVT_ATOMIC|CVT_EXCEPTION|REP_FN) )
#endif
return FALSE;
for(s = *sp, e = s+*lenp; s<e; s++)
{ if ( !*s )
return PL_domain_error("text_non_zero_code", arg);
}
return TRUE;
}
#ifdef __WINDOWS__
#define ECHARS(s) L##s
#else
#define ECHARS(s) s
#endif
static int
already_in_env(const echar *env, int count, const echar *e)
{ for(; count-- > 0; env += ecslen(env)+1)
{ const echar *s, *q;
for(s=env, q=e; *s && *q && *s == *q && *s != '=' && *q != '='; s++,q++)
;
if (*s == *q && *s == '=' )
return TRUE;
}
return FALSE;
}
static int
parse_environment(term_t t, p_options *info, int pass)
{ term_t tail = PL_copy_term_ref(t);
term_t head = PL_new_term_ref();
term_t tmp = PL_new_term_ref();
ecbuf *eb = &info->envbuf;
int count = 0;
#ifndef __WINDOWS__
echar *q;
char **ep;
int c = 0;
#endif
if ( eb->buffer )
return PL_permission_error("redefine", "environment", t);
while( PL_get_list(tail, head, tail) )
{ echar *s;
size_t len;
if ( !PL_is_functor(head, FUNCTOR_eq2) )
return PL_type_error("environment_variable", head);
if ( !get_echars_arg_ex(1, head, tmp, &s, &len) )
return FALSE;
add_ecbuf(eb, s, len);
add_ecbuf(eb, ECHARS("="), 1);
if ( !get_echars_arg_ex(2, head, tmp, &s, &len) )
return FALSE;
add_ecbuf(eb, s, len);
add_ecbuf(eb, ECHARS("\0"), 1);
count++;
}
if ( !PL_get_nil_ex(tail) )
return FALSE;
if ( pass && count == 0 )
return TRUE; /* environment([]) is a no-op */
if ( pass )
{
#ifndef __WINDOWS__
#ifdef HAVE__NSGETENVIRON
char **environ = *_NSGetEnviron();
#else
extern char **environ;
#endif
char **e;
int count0 = count;
for(e=environ; e && *e; e++)
{ if ( !already_in_env(eb->buffer, count0, *e) )
{ add_ecbuf(eb, *e, strlen(*e));
add_ecbuf(eb, ECHARS("\0"), 1);
count++;
}
}
#else /*__WINDOWS__*/
echar *env = GetEnvironmentStringsW();
if ( env )
{ int count0 = count;
while(*env)
{ size_t len = wcslen(env);
if ( !already_in_env(eb->buffer, count0, env) )
{ add_ecbuf(eb, env, len+1);
count++;
}
env += len+1;
}
}
#endif /*__WINDOWS__*/
}
#ifdef __WINDOWS__
add_ecbuf(eb, ECHARS("\0"), 1);
if ( count == 0 )
add_ecbuf(eb, ECHARS("\0"), 1);
#else
info->envp = PL_malloc((count+1)*sizeof(char*));
for(ep=info->envp, c=0, q=eb->buffer; c<count; c++, ep++)
{ *ep = q;
q += strlen(q)+1;
}
assert((size_t)(q-eb->buffer) == eb->size);
*ep = NULL;
#endif
return TRUE;
}
static int
get_type(term_t head, IOENC *enc)
{ atom_t a;
if ( PL_get_atom_ex(head, &a) )
{ if ( a == ATOM_text )
*enc = ENC_ANSI;
else if ( a == ATOM_binary )
*enc = ENC_OCTET;
else
return PL_domain_error("stream_type", head);
return TRUE;
}
return FALSE;
}
/* TBD: provide a public API for translating encoding names to
* the IOENC enum
*/
static int
get_encoding(term_t head, IOENC *enc)
{ atom_t a;
if ( PL_get_atom_ex(head, &a) )
{ IOENC e;
if ( (e=PL_atom_to_encoding(a)) != ENC_UNKNOWN )
{ *enc = e;
return TRUE;
}
return PL_domain_error("encoding", head);
}
return FALSE;
}
static int
get_stream(term_t t, p_options *info, p_stream *stream, atom_t name)
{ atom_t a;
int i;
if ( PL_get_atom(t, &a) )
{ if ( a == ATOM_null )
{ stream->type = std_null;
return TRUE;
} else if ( a == ATOM_std )
{ stream->type = std_std;
return TRUE;
} else
{ return PL_domain_error("process_stream", t);
}
} else if ( PL_is_functor(t, FUNCTOR_pipe1) ||
PL_is_functor(t, FUNCTOR_pipe2) )
{ stream->term = PL_new_term_ref();
stream->encoding = ENC_ANSI;
_PL_get_arg(1, t, stream->term);
if ( !PL_is_variable(stream->term) )
{ for (i = 0; i < info->pipes; i++)
{ if (PL_compare(info->streams[i].term, t) == 0)
break;
}
if (i == info->pipes)
return PL_uninstantiation_error(stream->term);
}
if ( PL_is_functor(t, FUNCTOR_pipe2) )
{ term_t tail = PL_new_term_ref();
term_t head = PL_new_term_ref();
_PL_get_arg(2, t, tail);
while(PL_get_list_ex(tail, head, tail))
{ if ( PL_is_functor(head, FUNCTOR_type1) )
{ _PL_get_arg(1, head, head);
if ( !get_type(head, &stream->encoding) )
return FALSE;
} else if ( PL_is_functor(head, FUNCTOR_encoding1) )
{ _PL_get_arg(1, head, head);
if ( !get_encoding(head, &stream->encoding) )
return FALSE;
} else
return PL_domain_error("pipe_option", head);
}
if ( !PL_get_nil_ex(tail) )
return FALSE;
}
stream->type = std_pipe;
info->pipes++;
return TRUE;
} else if ( PL_is_functor(t, FUNCTOR_stream1) )
{ IOSTREAM *s;
stream->term = PL_new_term_ref();
_PL_get_arg(1, t, stream->term);
if ( !PL_get_stream(stream->term, &s,
name == ATOM_stdin ? SIO_INPUT : SIO_OUTPUT) )
return FALSE;
stream->type = std_stream;
#ifdef __WINDOWS__
HANDLE h = Swinhandle(s);
if ( h )
stream->fd[0] = stream->fd[1] = h;
else
return PL_domain_error("file_stream", stream->term);
#else
int fd = Sfileno(s);
if ( fd >= 0 )
stream->fd[0] = stream->fd[1] = fd;
else
return PL_domain_error("file_stream", stream->term);
#endif
return TRUE;
} else
return PL_type_error("process_stream", t);
}
static int
parse_options(term_t options, p_options *info)
{ term_t tail = PL_copy_term_ref(options);
term_t head = PL_new_term_ref();
term_t arg = PL_new_term_ref();
info->window = MAYBE;
while(PL_get_list(tail, head, tail))
{ atom_t name;
size_t arity;
if ( !PL_get_name_arity(head, &name, &arity) || arity != 1 )
return PL_type_error("option", head);
_PL_get_arg(1, head, arg);
if ( name == ATOM_stdin )
{ if ( !get_stream(arg, info, &info->streams[0], name) )
return FALSE;
} else if ( name == ATOM_stdout )
{ if ( !get_stream(arg, info, &info->streams[1], name) )
return FALSE;
} else if ( name == ATOM_stderr )
{ if ( !get_stream(arg, info, &info->streams[2], name) )
return FALSE;
} else if ( name == ATOM_process )
{ info->pid = PL_copy_term_ref(arg);
} else if ( name == ATOM_detached )
{ if ( !PL_get_bool_ex(arg, &info->detached) )
return FALSE;
} else if ( name == ATOM_cwd )
{
#ifdef __WINDOWS__
if ( !PL_get_wchars(arg, NULL, &info->cwd,
CVT_ATOM|CVT_STRING|CVT_EXCEPTION|BUF_MALLOC) )
return FALSE;
#else
if ( !PL_get_chars(arg, &info->cwd,
CVT_ATOM|CVT_STRING|CVT_EXCEPTION|BUF_MALLOC|REP_FN) )
return FALSE;
#endif
} else if ( name == ATOM_window )
{ if ( !PL_get_bool_ex(arg, &info->window) )
return FALSE;
} else if ( name == ATOM_env )
{ if ( !parse_environment(arg, info, FALSE) )
return FALSE;
} else if ( name == ATOM_environment )
{ if ( !parse_environment(arg, info, TRUE) )
return FALSE;
} else if ( name == ATOM_priority )
{ int tmp;
if ( !PL_get_integer_ex(arg, &tmp) )
return FALSE;
if ( tmp < -20 || tmp > 19 )
return PL_domain_error("priority_option", arg);
info->priority = tmp;
} else
return PL_domain_error("process_option", head);
}
if ( !PL_get_nil_ex(tail) )
return FALSE;
return TRUE;
}
static int
get_exe(term_t exe, p_options *info)
{ size_t arity;
term_t arg = PL_new_term_ref();
if ( !PL_get_name_arity(exe, &info->exe_name, &arity) )
return PL_type_error("callable", exe);
PL_put_atom(arg, info->exe_name);
#ifdef __WINDOWS__
if ( !PL_get_wchars(arg, NULL, &info->exe, CVT_ATOM|CVT_EXCEPTION|BUF_MALLOC) )
return FALSE;
if ( !win_command_line(exe, arity, info->exe, &info->cmdline) )
return FALSE;
#else /*__WINDOWS__*/
if ( !PL_get_chars(arg, &info->exe, CVT_ATOM|CVT_EXCEPTION|BUF_MALLOC|REP_FN) )
return FALSE;
if ( !(info->argv = PL_malloc((arity+2)*sizeof(char*))) )
return PL_resource_error("memory");
memset(info->argv, 0, (arity+2)*sizeof(char*));
if ( !(info->argv[0] = PL_malloc(strlen(info->exe)+1)) )
return PL_resource_error("memory");
strcpy(info->argv[0], info->exe);
{ size_t i;
for(i=1; i<=arity; i++)
{ _PL_get_arg(i, exe, arg);
if ( !PL_get_chars(arg, &info->argv[i],
CVT_ATOMIC|CVT_EXCEPTION|BUF_MALLOC|REP_FN) )
return FALSE;
}
info->argv[i] = NULL;
}
#endif /*__WINDOWS__*/
return TRUE;
}
static void
free_options(p_options *info) /* TBD: close streams */
{ if ( info->exe )
{ PL_free(info->exe);
info->exe = NULL;
}
if ( info->cwd )
{ PL_free(info->cwd);
info->cwd = NULL;
}
#ifndef __WINDOWS__
if ( info->envp )
{ PL_free(info->envp);
info->envp = NULL;
}
#endif
free_ecbuf(&info->envbuf);
#ifdef __WINDOWS__
if ( info->cmdline )
{ PL_free(info->cmdline);
info->cmdline = NULL;
}
#else /*__WINDOWS__*/
if ( info->argv )
{ char **a;
for(a=info->argv; *a; a++)
{ if ( *a )
PL_free(*a);
}
PL_free(info->argv);
info->argv = NULL;
}
#endif /*__WINDOWS__*/
}
/*******************************
* PROCESS READS *
*******************************/
#define PROCESS_MAGIC 0x29498001
typedef struct process_context
{ int magic; /* PROCESS_MAGIC */
#ifdef __WINDOWS__
HANDLE handle; /* process handle */
#else
pid_t pid; /* the process id */
#endif
int open_mask; /* Open streams */
int pipes[3]; /* stdin/stdout/stderr */
atom_t exe_name; /* exe as atom */
} process_context;
static int wait_for_process(process_context *pc);
static int
process_fd(void *handle, process_context **PC)
{ process_context *pc = (process_context*) ((uintptr_t)handle&~(uintptr_t)0x3);
int pipe = (int)(uintptr_t)handle & 0x3;
if ( pc->magic == PROCESS_MAGIC )
{ if ( PC )
*PC = pc;
return pc->pipes[pipe];
}
return -1;
}
static ssize_t
Sread_process(void *handle, char *buf, size_t size)
{ int fd = process_fd(handle, NULL);
return (*Sfilefunctions.read)((void*)(uintptr_t)fd, buf, size);
}
static ssize_t
Swrite_process(void *handle, char *buf, size_t size)
{ int fd = process_fd(handle, NULL);
return (*Sfilefunctions.write)((void*)(uintptr_t)fd, buf, size);
}
static int
Sclose_process(void *handle)
{ process_context *pc;
int fd = process_fd(handle, &pc);
if ( fd >= 0 )
{ int which = (int)(uintptr_t)handle & 0x3;
int rc;
rc = (*Sfilefunctions.close)((void*)(uintptr_t)fd);
pc->open_mask &= ~(1<<which);
DEBUG(Sdprintf("Closing fd[%d]; mask = 0x%x\n", which, pc->open_mask));
if ( !pc->open_mask )
{ int rcw = wait_for_process(pc);
return rcw ? 0 : -1;
}
return rc;
}
return -1;
}
static int
Scontrol_process(void *handle, int action, void *arg)
{ process_context *pc;
int fd = process_fd(handle, &pc);
switch(action)
{ case SIO_GETFILENO:
{ int *fdp = arg;
*fdp = fd;
return 0;
}
default:
return (*Sfilefunctions.control)((void*)(uintptr_t)fd, action, arg);
}
}
static IOFUNCTIONS Sprocessfunctions =
{ Sread_process,
Swrite_process,
NULL, /* seek */
Sclose_process,
Scontrol_process,
NULL /* seek64 */
};
static IOSTREAM *
open_process_pipe(process_context *pc, p_options *info, int which, int fdn)
{ void *handle;
#ifdef __WINDOWS__
HANDLE fd = info->streams[which].fd[fdn];
#else
int fd = info->streams[which].fd[fdn];
#endif
int flags = SIO_RECORDPOS|SIO_FBUF;
IOSTREAM *s;
pc->open_mask |= (1<<which);
#ifdef __WINDOWS__
pc->pipes[which] = Swin_open_osfhandle(fd, _O_BINARY);
#else
pc->pipes[which] = fd;
#endif
if ( info->streams[which].encoding != ENC_OCTET )
flags |= SIO_TEXT;
if ( which == 0 )
flags |= SIO_OUTPUT;
else
flags |= SIO_INPUT;
handle = (void *)((uintptr_t)pc | (uintptr_t)which);
if ( (s=Snew(handle, flags, &Sprocessfunctions)) )
s->encoding = info->streams[which].encoding;
return s;
}
/*******************************
* OS STUFF *
*******************************/
#ifdef __WINDOWS__
CRITICAL_SECTION process_lock;
#define LOCK() EnterCriticalSection(&process_lock);
#define UNLOCK() LeaveCriticalSection(&process_lock);
/* We need a root job to put non-detached processes into */
static HANDLE rootJob = (HANDLE)0;
static IOFUNCTIONS Sprocessfilefunctions = { 0, };
static void
win_init(void)
{ InitializeCriticalSection(&process_lock);
JOBOBJECT_EXTENDED_LIMIT_INFORMATION jeli;
rootJob = CreateJobObject(NULL, NULL);
if (rootJob == NULL) /* Already in a job */
return;
memset(&jeli, 0, sizeof(jeli));
jeli.BasicLimitInformation.LimitFlags = JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE;
/* This will fail (silently) if we dont have permission to manage processes */
SetInformationJobObject(rootJob, JobObjectExtendedLimitInformation,
&jeli, sizeof(jeli));
memcpy(&Sprocessfilefunctions, &Sfilefunctions, sizeof(IOFUNCTIONS));
Sprocessfilefunctions.seek = NULL;
Sprocessfilefunctions.seek64 = NULL;
}
#include "win_error.c"
typedef struct arg_string
{ size_t len;
wchar_t *text;
wchar_t quote;
} arg_string;
#define QMISC 0x1
#define QDBLQ 0x2
#define QSBLQ 0x4
static int
set_quote(arg_string *as)
{ int needq = 0;
const wchar_t *s = as->text;
for(; *s; s++)
{ if ( !iswalnum(*s) )
{ if ( *s == '"' )
needq |= QDBLQ;
else if ( *s == '\'' )
needq |= QSBLQ;
else
needq |= QMISC;
}
}
if ( !needq )
{ as->quote = 0;
return TRUE;
}
needq &= ~QMISC;
switch( needq )
{ case QDBLQ:
as->quote = '\'';
return TRUE;
case 0:
case QSBLQ:
as->quote = '"';
return TRUE;
default:
return FALSE;
}
}
static int
win_command_line(term_t t, size_t arity, const wchar_t *exe, wchar_t **cline)
{ if ( arity > 0 )
{ arg_string *av = PL_malloc((arity+1)*sizeof(*av));
term_t arg = PL_new_term_ref();
size_t cmdlen;
wchar_t *cmdline, *o;
const wchar_t *b;
size_t i;
if ( (b=wcsrchr(exe, '\\')) )
b++;
else
b = exe;
av[0].text = (wchar_t*)b;
av[0].len = wcslen(av[0].text);
set_quote(&av[0]);
cmdlen = av[0].len+(av[0].quote?2:0)+1;
for( i=1; i<=arity; i++)
{ _PL_get_arg(i, t, arg);
if ( !PL_get_wchars(arg, &av[i].len, &av[i].text,
CVT_ATOMIC|CVT_EXCEPTION|BUF_MALLOC) )
return FALSE;
if ( wcslen(av[i].text) != av[i].len )
return PL_domain_error("no_zero_code_atom", arg);
if ( !set_quote(&av[i]) )
return PL_domain_error("dos_quotable_atom", arg);
cmdlen += av[i].len+(av[i].quote?2:0)+1;
}
cmdline = PL_malloc(cmdlen*sizeof(wchar_t));
for( o=cmdline,i=0; i<=arity; )
{ wchar_t *s = av[i].text;
if ( av[i].quote )
*o++ = av[i].quote;
wcsncpy(o, s, av[i].len);
o += av[i].len;
if ( i > 0 )
PL_free(s); /* do not free shared exename */
if ( av[i].quote )
*o++ = av[i].quote;
if (++i <= arity)
*o++ = ' ';
}
*o = 0;
PL_free(av);
*cline = cmdline;
} else
{ *cline = NULL;
}
return TRUE;
}
typedef struct win_process
{ DWORD pid;
HANDLE handle;
HANDLE job;
struct win_process *next;
} win_process;
static win_process *processes;
static void
register_process(DWORD pid, HANDLE h, HANDLE job)
{ win_process *wp = PL_malloc(sizeof(*wp));
wp->pid = pid;
wp->handle = h;
wp->job = job;
LOCK();
wp->next = processes;
processes = wp;
UNLOCK();
}
static int
unregister_process(DWORD pid)
{ win_process **wpp, *wp;
LOCK();
for(wpp=&processes, wp=*wpp; wp; wpp=&wp->next, wp=*wpp)
{ if ( wp->pid == pid )
{ *wpp = wp->next;
PL_free(wp);
UNLOCK();
return TRUE;
}