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diff --git a/libguile/posix-w32.c b/libguile/posix-w32.c
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+++ b/libguile/posix-w32.c
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+/* Copyright 2001,2006,2008,2016,2018
+ Free Software Foundation, Inc.
+
+ This file is part of Guile.
+
+ Guile is free software: you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published
+ by the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Guile 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 Lesser General Public
+ License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with Guile. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+# define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#include <c-strcase.h>
+#include <process.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <signal.h>
+#include <io.h>
+#include <fcntl.h>
+
+#include "gc.h" /* for scm_*alloc, scm_strdup */
+#include "threads.h" /* for scm_i_scm_pthread_mutex_lock */
+
+#include "posix-w32.h"
+
+/*
+ * Get name and information about current kernel.
+ */
+int
+uname (struct utsname *uts)
+{
+ enum { WinNT, Win95, Win98, WinUnknown };
+ OSVERSIONINFO osver;
+ SYSTEM_INFO sysinfo;
+ DWORD sLength;
+ DWORD os = WinUnknown;
+
+ memset (uts, 0, sizeof (*uts));
+
+ osver.dwOSVersionInfoSize = sizeof (osver);
+ GetVersionEx (&osver);
+ GetSystemInfo (&sysinfo);
+
+ switch (osver.dwPlatformId)
+ {
+ case VER_PLATFORM_WIN32_NT: /* NT, Windows 2000 or Windows XP */
+ if (osver.dwMajorVersion == 4)
+ strcpy (uts->sysname, "Windows NT4x"); /* NT4x */
+ else if (osver.dwMajorVersion <= 3)
+ strcpy (uts->sysname, "Windows NT3x"); /* NT3x */
+ else if (osver.dwMajorVersion == 5 && osver.dwMinorVersion < 1)
+ strcpy (uts->sysname, "Windows 2000"); /* 2k */
+ else if (osver.dwMajorVersion < 6)
+ strcpy (uts->sysname, "Windows XP"); /* XP */
+ else if (osver.dwMajorVersion == 6)
+ {
+ if (osver.dwMinorVersion < 1)
+ strcpy (uts->sysname, "Windows Vista"); /* Vista */
+ else if (osver.dwMinorVersion < 2)
+ strcpy (uts->sysname, "Windows 7"); /* Windows 7 */
+ else if (osver.dwMinorVersion < 3)
+ strcpy (uts->sysname, "Windows 8"); /* Windows 8 */
+ else if (osver.dwMinorVersion < 4)
+ strcpy (uts->sysname, "Windows 8.1"); /* Windows 8.1 */
+ }
+ else if (osver.dwMajorVersion >= 10)
+ strcpy (uts->sysname, "Windows 10 or later"); /* Windows 10 and later */
+ os = WinNT;
+ break;
+
+ case VER_PLATFORM_WIN32_WINDOWS: /* Win95, Win98 or WinME */
+ if ((osver.dwMajorVersion > 4) ||
+ ((osver.dwMajorVersion == 4) && (osver.dwMinorVersion > 0)))
+ {
+ if (osver.dwMinorVersion >= 90)
+ strcpy (uts->sysname, "Windows ME"); /* ME */
+ else
+ strcpy (uts->sysname, "Windows 98"); /* 98 */
+ os = Win98;
+ }
+ else
+ {
+ strcpy (uts->sysname, "Windows 95"); /* 95 */
+ os = Win95;
+ }
+ break;
+
+ case VER_PLATFORM_WIN32s: /* Windows 3.x */
+ strcpy (uts->sysname, "Windows");
+ break;
+ }
+
+ sprintf (uts->version, "%ld.%02ld",
+ osver.dwMajorVersion, osver.dwMinorVersion);
+
+ if (osver.szCSDVersion[0] != '\0' &&
+ (strlen (osver.szCSDVersion) + strlen (uts->version) + 1) <
+ sizeof (uts->version))
+ {
+ strcat (uts->version, " ");
+ strcat (uts->version, osver.szCSDVersion);
+ }
+
+ sprintf (uts->release, "build %ld", osver.dwBuildNumber & 0xFFFF);
+
+ switch (sysinfo.wProcessorArchitecture)
+ {
+ case PROCESSOR_ARCHITECTURE_PPC:
+ strcpy (uts->machine, "ppc");
+ break;
+ case PROCESSOR_ARCHITECTURE_ALPHA:
+ strcpy (uts->machine, "alpha");
+ break;
+ case PROCESSOR_ARCHITECTURE_MIPS:
+ strcpy (uts->machine, "mips");
+ break;
+ case PROCESSOR_ARCHITECTURE_IA64:
+ strcpy (uts->machine, "ia64");
+ break;
+ case PROCESSOR_ARCHITECTURE_INTEL:
+ /*
+ * dwProcessorType is only valid in Win95 and Win98 and WinME
+ * wProcessorLevel is only valid in WinNT
+ */
+ switch (os)
+ {
+ case Win95:
+ case Win98:
+ switch (sysinfo.dwProcessorType)
+ {
+ case PROCESSOR_INTEL_386:
+ case PROCESSOR_INTEL_486:
+ case PROCESSOR_INTEL_PENTIUM:
+ sprintf (uts->machine, "i%ld", sysinfo.dwProcessorType);
+ break;
+ default:
+ strcpy (uts->machine, "i386");
+ break;
+ }
+ break;
+ case WinNT:
+ sprintf (uts->machine, "i%d86", sysinfo.wProcessorLevel);
+ break;
+ default:
+ strcpy (uts->machine, "unknown");
+ break;
+ }
+ break;
+ case PROCESSOR_ARCHITECTURE_AMD64:
+ strcpy (uts->machine, "x86_64");
+ break;
+ default:
+ strcpy (uts->machine, "unknown");
+ break;
+ }
+
+ sLength = sizeof (uts->nodename) - 1;
+ GetComputerName (uts->nodename, &sLength);
+ return 0;
+}
+
+/* Utility functions for maintaining the list of subprocesses launched
+ by Guile. */
+
+struct proc_record {
+ DWORD pid;
+ HANDLE handle;
+};
+
+static struct proc_record *procs;
+static ptrdiff_t proc_size;
+
+/* Find the process slot that corresponds to PID. Return the index of
+ the slot, or -1 if not found. */
+static ptrdiff_t
+find_proc (pid_t pid)
+{
+ ptrdiff_t found = -1, i;
+
+ for (i = 0; i < proc_size; i++)
+ {
+ if (procs[i].pid == pid && procs[i].handle != INVALID_HANDLE_VALUE)
+ found = i;
+ }
+
+ return found;
+}
+
+/* Return the process handle corresponding to its PID. If not found,
+ return invalid handle value. */
+static HANDLE
+proc_handle (pid_t pid)
+{
+ ptrdiff_t idx = find_proc (pid);
+
+ if (idx < 0)
+ return INVALID_HANDLE_VALUE;
+ return procs[idx].handle;
+}
+
+/* Store a process record in the procs[] array. */
+static void
+record_proc (pid_t proc_pid, HANDLE proc_handle)
+{
+ ptrdiff_t i;
+
+ /* Find a vacant slot. */
+ for (i = 0; i < proc_size; i++)
+ {
+ if (procs[i].handle == INVALID_HANDLE_VALUE)
+ break;
+ }
+
+ /* If no vacant slot, enlarge the array. */
+ if (i == proc_size)
+ {
+ proc_size++;
+ procs = scm_realloc (procs, proc_size * sizeof(procs[0]));
+ }
+
+ /* Store the process data. */
+ procs[i].pid = proc_pid;
+ procs[i].handle = proc_handle;
+}
+
+/* Delete a process record for process PID. */
+static void
+delete_proc (pid_t pid)
+{
+ ptrdiff_t idx = find_proc (pid);
+
+ if (0 <= idx && idx < proc_size)
+ procs[idx].handle = INVALID_HANDLE_VALUE;
+}
+
+/* Run a child process with redirected standard handles, without
+ redirecting standard handles of the parent. This is required in
+ multithreaded programs, where redirecting a standard handle affects
+ all threads. */
+
+/* Prepare a possibly redirected file handle to be passed to a child
+ process. The handle is for the file/device open on file descriptor
+ FD; if FD is invalid, use the null device instead.
+
+ USE_STD non-zero means we have been passed the descriptor used by
+ the parent.
+
+ ACCESS is the Windows access mode for opening the null device.
+
+ Returns the Win32 handle to be passed to CreateProcess. */
+static HANDLE
+prepare_child_handle (int fd, int use_std, DWORD access)
+{
+ HANDLE htem, hret;
+ DWORD err = 0;
+
+ /* Start with the descriptor, if specified by the caller and valid,
+ otherwise open the null device. */
+ if (fd < 0)
+ htem = INVALID_HANDLE_VALUE;
+ else
+ htem = (HANDLE)_get_osfhandle (fd);
+
+ /* Duplicate the handle and make it inheritable. */
+ if (DuplicateHandle (GetCurrentProcess (),
+ htem,
+ GetCurrentProcess (),
+ &hret,
+ 0,
+ TRUE,
+ DUPLICATE_SAME_ACCESS) == FALSE)
+ {
+ /* If the original standard handle was invalid (happens, e.g.,
+ in GUI programs), open the null device instead. */
+ if ((err = GetLastError ()) == ERROR_INVALID_HANDLE
+ && use_std)
+ {
+ htem = CreateFile ("NUL", access,
+ FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
+ OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+ if (htem != INVALID_HANDLE_VALUE
+ && DuplicateHandle (GetCurrentProcess (),
+ htem,
+ GetCurrentProcess (),
+ &hret,
+ 0,
+ TRUE,
+ DUPLICATE_SAME_ACCESS) == FALSE)
+ {
+ err = GetLastError ();
+ CloseHandle (htem);
+ hret = INVALID_HANDLE_VALUE;
+ }
+ }
+ }
+
+ if (hret == INVALID_HANDLE_VALUE)
+ {
+ switch (err)
+ {
+ case ERROR_NO_MORE_FILES:
+ errno = EMFILE;
+ break;
+ case ERROR_INVALID_HANDLE:
+ default:
+ errno = EBADF;
+ break;
+ }
+ }
+
+ return hret;
+}
+
+/* A comparison function for sorting the environment. */
+static int
+compenv (const void *a1, const void *a2)
+{
+ return stricmp (*((char**)a1), *((char**)a2));
+}
+
+/* Convert the program's 'environ' array to a block of environment
+ variables suitable to be passed to CreateProcess. This is needed
+ to ensure the child process inherits the up-to-date environment of
+ the parent, including any variables inserted by the parent. */
+static void
+prepare_envblk (char **envp, char **envblk)
+{
+ char **tmp;
+ int size_needed;
+ int envcnt;
+ char *ptr;
+
+ for (envcnt = 0; envp[envcnt]; envcnt++)
+ ;
+
+ tmp = scm_calloc ((envcnt + 1) * sizeof (*tmp));
+
+ for (envcnt = size_needed = 0; envp[envcnt]; envcnt++)
+ {
+ tmp[envcnt] = envp[envcnt];
+ size_needed += strlen (envp[envcnt]) + 1;
+ }
+ size_needed++;
+
+ /* Windows likes its environment variables sorted. */
+ qsort ((void *) tmp, (size_t) envcnt, sizeof (char *), compenv);
+
+ /* CreateProcess needs the environment block as a linear array,
+ where each variable is terminated by a null character, and the
+ last one is terminated by 2 null characters. */
+ ptr = *envblk = scm_calloc (size_needed);
+
+ for (envcnt = 0; tmp[envcnt]; envcnt++)
+ {
+ strcpy (ptr, tmp[envcnt]);
+ ptr += strlen (tmp[envcnt]) + 1;
+ }
+
+ free (tmp);
+}
+
+/* Find an executable PROGRAM on PATH, return result in malloc'ed
+ storage. If PROGRAM is /bin/sh, and no sh.exe was found on PATH,
+ fall back on the Windows shell and set BIN_SH_REPLACED to non-zero. */
+static char *
+lookup_cmd (const char *program, int *bin_sh_replaced)
+{
+ static const char *extensions[] = {
+ ".exe", ".cmd", ".bat", "", ".com", NULL
+ };
+ int bin_sh_requested = 0;
+ char *path, *dir, *sep;
+ char abs_name[MAX_PATH];
+ DWORD abs_namelen = 0;
+
+ /* If they ask for the Unix system shell, try to find it on PATH. */
+ if (c_strcasecmp (program, "/bin/sh") == 0)
+ {
+ bin_sh_requested = 1;
+ program = "sh.exe";
+ }
+
+ /* If PROGRAM includes leading directories, the caller already did
+ our job. */
+ if (strchr (program, '/') != NULL
+ || strchr (program, '\\') != NULL)
+ return scm_strdup (program);
+
+ /* Note: It is OK for getenv below to return NULL -- in that case,
+ SearchPath will search in the directories whose list is specified
+ by the system Registry. */
+ path = getenv ("PATH");
+ if (!path) /* shouldn't happen, really */
+ path = ".";
+ dir = sep = path = strdup (path);
+ for ( ; sep && *sep; dir = sep + 1)
+ {
+ int i;
+
+ sep = strpbrk (dir, ";");
+ if (sep == dir) /* two or more ;'s in a row */
+ continue;
+ if (sep)
+ *sep = '\0';
+ for (i = 0; extensions[i]; i++)
+ {
+ abs_namelen = SearchPath (dir, program, extensions[i],
+ MAX_PATH, abs_name, NULL);
+ if (0 < abs_namelen && abs_namelen <= MAX_PATH) /* found! */
+ break;
+ }
+ if (extensions[i]) /* found! */
+ break;
+ if (sep)
+ *sep = ';';
+ }
+
+ free (path);
+
+ /* If they asked for /bin/sh and we didn't find it, fall back on the
+ default Windows shell. */
+ if (abs_namelen <= 0 && bin_sh_requested)
+ {
+ const char *shell = getenv ("ComSpec");
+
+ if (!shell)
+ shell = "C:\\Windows\\system32\\cmd.exe";
+
+ *bin_sh_replaced = 1;
+ strcpy (abs_name, shell);
+ abs_namelen = strlen (abs_name);
+ }
+
+ /* If not found, return the original PROGRAM name. */
+ if (abs_namelen <= 0 || abs_namelen > MAX_PATH)
+ return scm_strdup (program);
+
+ return scm_strndup (abs_name, abs_namelen);
+}
+
+/* Concatenate command-line arguments in argv[] into a single
+ command-line string, while quoting arguments as needed. The result
+ is malloc'ed. */
+static char *
+prepare_cmdline (const char *cmd, const char * const *argv, int bin_sh_replaced)
+{
+ /* These characters should include anything that is special to _any_
+ program, including both Windows and Unixy shells, and the
+ widlcard expansion in startup code of a typical Windows app. */
+ const char need_quotes[] = " \t#;\"\'*?[]&|<>(){}$`^";
+ size_t cmdlen = 1; /* for terminating null */
+ char *cmdline = scm_malloc (cmdlen);
+ char *dst = cmdline;
+ int cmd_exe_quoting = 0;
+ int i;
+ const char *p;
+
+ /* Are we constructing a command line for cmd.exe? */
+ if (bin_sh_replaced)
+ cmd_exe_quoting = 1;
+ else
+ {
+ for (p = cmd + strlen (cmd);
+ p > cmd && p[-1] != '/' && p[-1] != '\\' && p[-1] != ':';
+ p--)
+ ;
+ if (c_strcasecmp (p, "cmd.exe") == 0
+ || c_strcasecmp (p, "cmd") == 0)
+ cmd_exe_quoting = 1;
+ }
+
+ /* Initialize the command line to empty. */
+ *dst = '\0';
+
+ /* Append arguments, if any, from argv[]. */
+ for (i = 0; argv[i]; i++)
+ {
+ const char *src = argv[i];
+ size_t len;
+ int quote_this = 0, n_backslashes = 0;
+ int j;
+
+ /* Append the blank separator. We don't do that for argv[0]
+ because that is the command name (will end up in child's
+ argv[0]), and is only recognized as such if there're no
+ blanks before it. */
+ if (i > 0)
+ *dst++ = ' ';
+ len = dst - cmdline;
+
+ /* How much space is required for this argument? */
+ cmdlen += strlen (argv[i]) + 1; /* 1 for a blank separator */
+ /* cmd.exe needs a different style of quoting: all the arguments
+ beyond the /c switch are enclosed in an extra pair of quotes,
+ and not otherwise quoted/escaped. */
+ if (cmd_exe_quoting)
+ {
+ if (i == 2)
+ cmdlen += 2;
+ }
+ else if (strpbrk (argv[i], need_quotes))
+ {
+ quote_this = 1;
+ cmdlen += 2;
+ for ( ; *src; src++)
+ {
+ /* An embedded quote needs to be escaped by a backslash.
+ Any backslashes immediately preceding that quote need
+ each one to be escaped by another backslash. */
+ if (*src == '\"')
+ cmdlen += n_backslashes + 1;
+ if (*src == '\\')
+ n_backslashes++;
+ else
+ n_backslashes = 0;
+ }
+ /* If the closing quote we will add is preceded by
+ backslashes, those backslashes need to be escaped. */
+ cmdlen += n_backslashes;
+ }
+
+ /* Enlarge the command-line string as needed. */
+ cmdline = scm_realloc (cmdline, cmdlen);
+ dst = cmdline + len;
+
+ if (i == 0
+ && c_strcasecmp (argv[0], "/bin/sh") == 0
+ && bin_sh_replaced)
+ {
+ strcpy (dst, "cmd.exe");
+ dst += sizeof ("cmd.exe") - 1;
+ continue;
+ }
+ if (i == 1 && bin_sh_replaced && strcmp (argv[1], "-c") == 0)
+ {
+ *dst++ = '/';
+ *dst++ = 'c';
+ *dst = '\0';
+ continue;
+ }
+
+ /* Add this argument, possibly quoted, to the command line. */
+ if (quote_this || (i == 2 && cmd_exe_quoting))
+ *dst++ = '\"';
+ for (src = argv[i]; *src; src++)
+ {
+ if (quote_this)
+ {
+ if (*src == '\"')
+ for (j = n_backslashes + 1; j > 0; j--)
+ *dst++ = '\\';
+ if (*src == '\\')
+ n_backslashes++;
+ else
+ n_backslashes = 0;
+ }
+ *dst++ = *src;
+ }
+ if (quote_this)
+ {
+ for (j = n_backslashes; j > 0; j--)
+ *dst++ = '\\';
+ *dst++ = '\"';
+ }
+ *dst = '\0';
+ }
+
+ if (cmd_exe_quoting && i > 2)
+ {
+ /* One extra slot was already reserved when we enlarged cmdlen
+ by 2 in the "if (cmd_exe_quoting)" clause above. So we can
+ safely append a closing quote. */
+ *dst++ = '\"';
+ *dst = '\0';
+ }
+
+ return cmdline;
+}
+
+/* Start a child process running the program in EXEC_FILE with its
+ standard input and output optionally redirected to a pipe. ARGV is
+ the array of command-line arguments to pass to the child. P2C and
+ C2P are 2 pipes for communicating with the child, and ERRFD is the
+ standard error file descriptor to be inherited by the child.
+ READING and WRITING, if non-zero, mean that the corresponding pipe
+ will be used.
+
+ Return the PID of the child process, or -1 if couldn't start a
+ process. */
+pid_t
+start_child (const char *exec_file, char **argv,
+ int reading, int c2p[2], int writing, int p2c[2],
+ int infd, int outfd, int errfd)
+{
+ HANDLE hin = INVALID_HANDLE_VALUE, hout = INVALID_HANDLE_VALUE;
+ HANDLE herr = INVALID_HANDLE_VALUE;
+ STARTUPINFO si;
+ char *env_block = NULL;
+ char *cmdline = NULL;
+ PROCESS_INFORMATION pi;
+ char *progfile, *p;
+ int errno_save;
+ intptr_t pid;
+ int bin_sh_replaced = 0;
+
+ if (!reading)
+ c2p[1] = outfd;
+ if (!writing)
+ p2c[0] = infd;
+
+ /* Prepare standard handles to be passed to the child process. */
+ hin = prepare_child_handle (p2c[0], !writing, GENERIC_READ);
+ if (hin == INVALID_HANDLE_VALUE)
+ return -1;
+ hout = prepare_child_handle (c2p[1], !reading, GENERIC_WRITE);
+ if (hout == INVALID_HANDLE_VALUE)
+ return -1;
+ herr = prepare_child_handle (errfd, 1, GENERIC_WRITE);
+ if (herr == INVALID_HANDLE_VALUE)
+ return -1;
+
+ /* Make sure the parent side of both pipes is not inherited. This
+ is required because gnulib's 'pipe' creates pipes whose both ends
+ are inheritable, which is traditional on Posix (where pipe
+ descriptors are implicitly duplicated by 'fork'), but wrong on
+ Windows (where pipe handles need to be explicitly
+ duplicated). */
+ if (writing)
+ SetHandleInformation ((HANDLE)_get_osfhandle (p2c[1]),
+ HANDLE_FLAG_INHERIT, 0);
+ if (reading)
+ {
+ SetHandleInformation ((HANDLE)_get_osfhandle (c2p[0]),
+ HANDLE_FLAG_INHERIT, 0);
+ /* Gnulib's 'pipe' opens the pipe in binary mode, but we don't
+ want to read text-mode input of subprocesses in binary more,
+ because then we will get the ^M (a.k.a. "CR") characters we
+ don't expect. */
+ _setmode (c2p[0], _O_TEXT);
+ }
+
+ /* Set up the startup info for the child, using the parent's as the
+ starting point, and specify in it the redirected handles. */
+ GetStartupInfo (&si);
+ si.dwFlags = STARTF_USESTDHANDLES;
+ si.lpReserved = 0;
+ si.cbReserved2 = 0;
+ si.lpReserved2 = 0;
+ si.hStdInput = hin;
+ si.hStdOutput = hout;
+ si.hStdError = herr;
+
+ /* Create the environment block for the child. This is needed
+ because the environment we have in 'environ' is not in the format
+ expected by CreateProcess. */
+ prepare_envblk (environ, &env_block);
+
+ /* CreateProcess doesn't search PATH, so we must do that for it. */
+ progfile = lookup_cmd (exec_file, &bin_sh_replaced);
+
+ /* CreateProcess doesn't like forward slashes in the application
+ file name. */
+ for (p = progfile; *p; p++)
+ if (*p == '/')
+ *p = '\\';
+
+ /* Construct the command line. */
+ cmdline = prepare_cmdline (exec_file, (const char * const *)argv,
+ bin_sh_replaced);
+
+ /* All set and ready to fly. Launch the child process. */
+ if (!CreateProcess (progfile, cmdline, NULL, NULL, TRUE, 0, env_block, NULL,
+ &si, &pi))
+ {
+ pid = -1;
+
+ /* Since we use Win32 APIs directly, we need to translate their
+ errors to errno values by hand. */
+ switch (GetLastError ())
+ {
+ case ERROR_FILE_NOT_FOUND:
+ case ERROR_PATH_NOT_FOUND:
+ case ERROR_INVALID_DRIVE:
+ case ERROR_BAD_PATHNAME:
+ errno = ENOENT;
+ break;
+ case ERROR_ACCESS_DENIED:
+ errno = EACCES;
+ break;
+ case ERROR_BAD_ENVIRONMENT:
+ errno = E2BIG;
+ break;
+ case ERROR_BROKEN_PIPE:
+ errno = EPIPE;
+ break;
+ case ERROR_INVALID_HANDLE:
+ errno = EBADF;
+ break;
+ case ERROR_MAX_THRDS_REACHED:
+ errno = EAGAIN;
+ break;
+ case ERROR_BAD_EXE_FORMAT:
+ case ERROR_BAD_FORMAT:
+ default:
+ errno = ENOEXEC;
+ break;
+ }
+ }
+ else
+ {
+ scm_i_scm_pthread_mutex_lock (&scm_i_misc_mutex);
+ record_proc (pi.dwProcessId, pi.hProcess);
+ scm_i_pthread_mutex_unlock (&scm_i_misc_mutex);
+ pid = pi.dwProcessId;
+ }
+
+ errno_save = errno;
+
+ /* Free resources. */
+ free (progfile);
+ free (cmdline);
+ free (env_block);
+ CloseHandle (hin);
+ CloseHandle (hout);
+ CloseHandle (herr);
+ CloseHandle (pi.hThread);
+
+ /* Posix requires to call the shell if execvp fails to invoke EXEC_FILE. */
+ if (errno_save == ENOEXEC || errno_save == ENOENT)
+ {
+ const char *shell = getenv ("ComSpec");
+
+ if (!shell)
+ shell = "cmd.exe";
+
+ if (c_strcasecmp (exec_file, shell) != 0)
+ {
+ argv[0] = (char *)exec_file;
+ return start_child (shell, argv, reading, c2p, writing, p2c,
+ infd, outfd, errfd);
+ }
+ }
+
+ errno = errno_save;
+ return pid;
+}
+
+
+/* Emulation of waitpid which only supports WNOHANG, since _cwait doesn't. */
+int
+waitpid (pid_t pid, int *status, int options)
+{
+ HANDLE ph;
+
+ /* Not supported on MS-Windows. */
+ if (pid <= 0)
+ {
+ errno = ENOSYS;
+ return -1;
+ }
+
+ scm_i_scm_pthread_mutex_lock (&scm_i_misc_mutex);
+ ph = proc_handle (pid);
+ scm_i_pthread_mutex_unlock (&scm_i_misc_mutex);
+ /* Since scm_waitpid is documented to work only on child processes,
+ being unable to find a process in our records means failure. */
+ if (ph == INVALID_HANDLE_VALUE)
+ {
+ errno = ECHILD;
+ return -1;
+ }
+
+ if ((options & WNOHANG) != 0)
+ {
+ DWORD st;
+
+ if (!GetExitCodeProcess (ph, &st))
+ {
+ errno = ECHILD;
+ return -1;
+ }
+ if (st == STILL_ACTIVE)
+ return 0;
+ if (status)
+ *status = st;
+ CloseHandle (ph);
+ }
+ else
+ _cwait (status, (intptr_t)ph, WAIT_CHILD);
+
+ scm_i_scm_pthread_mutex_lock (&scm_i_misc_mutex);
+ delete_proc (pid);
+ scm_i_pthread_mutex_unlock (&scm_i_misc_mutex);
+
+ return pid;
+}
+
+
+/* Translate abnormal exit status of Windows programs into the signal
+ that terminated the program. This is required to support scm_kill
+ and WTERMSIG. */
+
+struct signal_and_status {
+ int sig;
+ DWORD status;
+};
+
+static const struct signal_and_status sigtbl[] = {
+ {SIGSEGV, 0xC0000005}, /* access to invalid address */
+ {SIGSEGV, 0xC0000008}, /* invalid handle */
+ {SIGILL, 0xC000001D}, /* illegal instruction */
+ {SIGILL, 0xC0000025}, /* non-continuable instruction */
+ {SIGSEGV, 0xC000008C}, /* array bounds exceeded */
+ {SIGFPE, 0xC000008D}, /* float denormal */
+ {SIGFPE, 0xC000008E}, /* float divide by zero */
+ {SIGFPE, 0xC000008F}, /* float inexact */
+ {SIGFPE, 0xC0000090}, /* float invalid operation */
+ {SIGFPE, 0xC0000091}, /* float overflow */
+ {SIGFPE, 0xC0000092}, /* float stack check */
+ {SIGFPE, 0xC0000093}, /* float underflow */
+ {SIGFPE, 0xC0000094}, /* integer divide by zero */
+ {SIGFPE, 0xC0000095}, /* integer overflow */
+ {SIGILL, 0xC0000096}, /* privileged instruction */
+ {SIGSEGV, 0xC00000FD}, /* stack overflow */
+ {SIGTERM, 0xC000013A}, /* Ctrl-C exit */
+ {SIGINT, 0xC000013A}
+};
+
+static int
+w32_signal_to_status (int sig)
+{
+ int i;
+
+ for (i = 0; i < sizeof (sigtbl) / sizeof (sigtbl[0]); i++)
+ if (sig == sigtbl[i].sig)
+ return sigtbl[i].status;
+
+ return (int)0xC000013A;
+}
+
+int
+w32_status_to_termsig (DWORD status)
+{
+ int i;
+
+ for (i = 0; i < sizeof (sigtbl) / sizeof (sigtbl[0]); i++)
+ if (status == sigtbl[i].status)
+ return sigtbl[i].sig;
+
+ return SIGTERM;
+}
+
+/* Support for scm_kill. */
+int
+kill (int pid, int sig)
+{
+ HANDLE ph;
+ int child_proc = 0;
+
+ if (pid == getpid ())
+ {
+ if (raise (sig) == 0)
+ errno = ENOSYS;
+ return -1;
+ }
+
+ scm_i_scm_pthread_mutex_lock (&scm_i_misc_mutex);
+ ph = proc_handle (pid);
+ scm_i_pthread_mutex_unlock (&scm_i_misc_mutex);
+ /* If not found among our subprocesses, look elsewhere in the
+ system. */
+ if (ph == INVALID_HANDLE_VALUE)
+ ph = OpenProcess (PROCESS_TERMINATE, 0, pid);
+ else
+ child_proc = 1;
+ if (!ph)
+ {
+ errno = EPERM;
+ return -1;
+ }
+ if (!TerminateProcess (ph, w32_signal_to_status (sig)))
+ {
+ /* If it's our subprocess, it could have already exited. In
+ that case, waitpid will handily delete the process from our
+ records, and we should return a more meaningful ESRCH to the
+ caller. */
+ if (child_proc && waitpid (pid, NULL, WNOHANG) == pid)
+ errno = ESRCH;
+ else
+ errno = EINVAL;
+ return -1;
+ }
+ CloseHandle (ph);
+ if (child_proc)
+ {
+ scm_i_scm_pthread_mutex_lock (&scm_i_misc_mutex);
+ delete_proc (pid);
+ scm_i_pthread_mutex_unlock (&scm_i_misc_mutex);
+ }
+
+ return 0;
+}
+
+/* Emulation of getpriority and setpriority. */
+#define NZERO 8
+
+int
+getpriority (int which, int who)
+{
+ HANDLE hp;
+ int nice_value = -1;
+ int error = 0;
+ int child_proc = 0;
+
+ /* We don't support process groups and users. */
+ if (which != PRIO_PROCESS)
+ {
+ errno = ENOSYS;
+ return -1;
+ }
+
+ if (who == 0)
+ hp = GetCurrentProcess ();
+ else
+ {
+ scm_i_scm_pthread_mutex_lock (&scm_i_misc_mutex);
+ hp = proc_handle (who);
+ scm_i_pthread_mutex_unlock (&scm_i_misc_mutex);
+ /* If not found among our subprocesses, look elsewhere in the
+ system. */
+ if (hp == INVALID_HANDLE_VALUE)
+ hp = OpenProcess (PROCESS_QUERY_INFORMATION, FALSE, who);
+ else
+ child_proc = 1;
+ }
+
+ if (hp)
+ {
+ DWORD pri_class = GetPriorityClass (hp);
+
+ /* The pseudo-handle returned by GetCurrentProcess doesn't need
+ to be closed. */
+ if (who > 0 && !child_proc)
+ CloseHandle (hp);
+
+ if (pri_class > 0)
+ {
+ switch (pri_class)
+ {
+ case IDLE_PRIORITY_CLASS:
+ nice_value = 4;
+ break;
+ case BELOW_NORMAL_PRIORITY_CLASS:
+ nice_value = 6;
+ break;
+ case NORMAL_PRIORITY_CLASS:
+ nice_value = 8;
+ break;
+ case ABOVE_NORMAL_PRIORITY_CLASS:
+ nice_value = 10;
+ break;
+ case HIGH_PRIORITY_CLASS:
+ nice_value = 13;
+ break;
+ case REALTIME_PRIORITY_CLASS:
+ nice_value = 24;
+ break;
+ }
+ /* If WHO is us, we can provide a more fine-grained value by
+ looking at the current thread's priority value. (For
+ other processes, it is not clear which thread to use.) */
+ if (who == 0 || who == GetCurrentProcessId ())
+ {
+ HANDLE ht = GetCurrentThread ();
+ int tprio = GetThreadPriority (ht);
+
+ switch (tprio)
+ {
+ case THREAD_PRIORITY_IDLE:
+ if (pri_class == REALTIME_PRIORITY_CLASS)
+ nice_value = 16;
+ else
+ nice_value = 1;
+ break;
+ case THREAD_PRIORITY_TIME_CRITICAL:
+ if (pri_class == REALTIME_PRIORITY_CLASS)
+ nice_value = 31;
+ else
+ nice_value = 15;
+ case THREAD_PRIORITY_ERROR_RETURN:
+ nice_value = -1;
+ error = 1;
+ break;
+ default:
+ nice_value += tprio;
+ break;
+ }
+ }
+ /* Map to "nice values" similar to what one would see on
+ Posix platforms. */
+ if (!error)
+ nice_value = - (nice_value - NZERO);
+ }
+ else
+ error = 1;
+ }
+ else
+ error = 1;
+
+ if (error)
+ {
+ DWORD err = GetLastError ();
+
+ switch (err)
+ {
+ case ERROR_INVALID_PARAMETER:
+ case ERROR_INVALID_THREAD_ID:
+ errno = ESRCH;
+ break;
+ default:
+ errno = EPERM;
+ break;
+ }
+ }
+
+ return nice_value;
+}
+
+int
+setpriority (int which, int who, int nice_val)
+{
+ HANDLE hp;
+ DWORD err;
+ int child_proc = 0, retval = -1;
+
+ if (which != PRIO_PROCESS)
+ {
+ errno = ENOSYS;
+ return -1;
+ }
+
+ if (who == 0)
+ hp = GetCurrentProcess ();
+ else
+ {
+ scm_i_scm_pthread_mutex_lock (&scm_i_misc_mutex);
+ hp = proc_handle (who);
+ scm_i_pthread_mutex_unlock (&scm_i_misc_mutex);
+ /* If not found among our subprocesses, look elsewhere in the
+ system. */
+ if (hp == INVALID_HANDLE_VALUE)
+ hp = OpenProcess (PROCESS_SET_INFORMATION, FALSE, who);
+ else
+ child_proc = 1;
+ }
+
+ if (hp)
+ {
+ DWORD pri_class;
+
+ /* Map "nice values" back to process priority classes. */
+ nice_val = -nice_val + NZERO;
+ if (nice_val < 6)
+ pri_class = IDLE_PRIORITY_CLASS;
+ else if (nice_val < 8)
+ pri_class = BELOW_NORMAL_PRIORITY_CLASS;
+ else if (nice_val < 10)
+ pri_class = NORMAL_PRIORITY_CLASS;
+ else if (nice_val < 13)
+ pri_class = ABOVE_NORMAL_PRIORITY_CLASS;
+ else if (nice_val < 16)
+ pri_class = HIGH_PRIORITY_CLASS;
+ else
+ pri_class = REALTIME_PRIORITY_CLASS;
+
+ if (SetPriorityClass (hp, pri_class))
+ retval = 0;
+ }
+
+ err = GetLastError ();
+
+ switch (err)
+ {
+ case ERROR_INVALID_PARAMETER:
+ errno = ESRCH;
+ break;
+ default:
+ errno = EPERM;
+ break;
+ }
+ /* The pseudo-handle returned by GetCurrentProcess doesn't
+ need to be closed. */
+ if (hp && who > 0 && !child_proc)
+ CloseHandle (hp);
+
+ return retval;
+}
+
+/* Emulation of sched_getaffinity and sched_setaffinity. */
+int
+sched_getaffinity (int pid, size_t mask_size, cpu_set_t *mask)
+{
+ HANDLE hp;
+ DWORD err;
+ int child_proc = 0;
+
+ if (mask == NULL)
+ {
+ errno = EFAULT;
+ return -1;
+ }
+
+ if (pid == 0)
+ hp = GetCurrentProcess ();
+ else
+ {
+ scm_i_scm_pthread_mutex_lock (&scm_i_misc_mutex);
+ hp = proc_handle (pid);
+ scm_i_pthread_mutex_unlock (&scm_i_misc_mutex);
+ /* If not found among our subprocesses, look elsewhere in the
+ system. */
+ if (hp == INVALID_HANDLE_VALUE)
+ hp = OpenProcess (PROCESS_QUERY_INFORMATION, FALSE, pid);
+ else
+ child_proc = 1;
+ }
+
+ if (hp)
+ {
+ DWORD_PTR ignored;
+ BOOL result = GetProcessAffinityMask (hp, (DWORD_PTR *)mask, &ignored);
+
+ /* The pseudo-handle returned by GetCurrentProcess doesn't
+ need to be closed. */
+ if (pid > 0 && !child_proc)
+ CloseHandle (hp);
+ if (result)
+ return 0;
+ }
+
+ err = GetLastError ();
+
+ switch (err)
+ {
+ case ERROR_INVALID_PARAMETER:
+ errno = ESRCH;
+ break;
+ case ERROR_ACCESS_DENIED:
+ default:
+ errno = EPERM;
+ break;
+ }
+
+ return -1;
+}
+
+int
+sched_setaffinity (int pid, size_t mask_size, cpu_set_t *mask)
+{
+ HANDLE hp;
+ DWORD err;
+ int child_proc = 0;
+
+ if (mask == NULL)
+ {
+ errno = EFAULT;
+ return -1;
+ }
+
+ if (pid == 0)
+ hp = GetCurrentProcess ();
+ else
+ {
+ scm_i_scm_pthread_mutex_lock (&scm_i_misc_mutex);
+ hp = proc_handle (pid);
+ scm_i_pthread_mutex_unlock (&scm_i_misc_mutex);
+ /* If not found among our subprocesses, look elsewhere in the
+ system. */
+ if (hp == INVALID_HANDLE_VALUE)
+ hp = OpenProcess (PROCESS_SET_INFORMATION, FALSE, pid);
+ else
+ child_proc = 1;
+ }
+
+ if (hp)
+ {
+ BOOL result = SetProcessAffinityMask (hp, *(DWORD_PTR *)mask);
+
+ /* The pseudo-handle returned by GetCurrentProcess doesn't
+ need to be closed. */
+ if (pid > 0 && !child_proc)
+ CloseHandle (hp);
+ if (result)
+ return 0;
+ }
+
+ err = GetLastError ();
+
+ switch (err)
+ {
+ case ERROR_INVALID_PARAMETER:
+ errno = ESRCH;
+ break;
+ case ERROR_ACCESS_DENIED:
+ default:
+ errno = EPERM;
+ break;
+ }
+
+ return -1;
+}