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/* gcc on mingw is hardcoded to use /mingw (which is c:/mingw) to
find various files. If this is a different version of mingw to the
one that we have in the GHC tree then things can go wrong. We
therefore need to add various -B flags to the gcc commandline,
so that it uses our in-tree mingw. Hence this wrapper. */
#include "cwrapper.h"
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <windows.h>
void die(const char *fmt, ...) {
va_list argp;
va_start(argp, fmt);
vfprintf(stderr, fmt, argp);
va_end(argp);
exit(1);
}
char *mkString(const char *fmt, ...) {
char *p;
int i, j;
va_list argp;
va_start(argp, fmt);
i = vsnprintf(NULL, 0, fmt, argp);
va_end(argp);
if (i < 0) {
die("vsnprintf 0 failed: errno %d: %s\n", errno, strerror(errno));
}
p = malloc(i + 1);
if (p == NULL) {
die("malloc failed: errno %d: %s\n", errno, strerror(errno));
}
va_start(argp, fmt);
j = vsnprintf(p, i + 1, fmt, argp);
va_end(argp);
if (j < 0) {
die("vsnprintf with %d failed: errno %d: %s\n",
i + 1, errno, strerror(errno));
}
return p;
}
char *flattenAndQuoteArgs(char *ptr, int argc, char *argv[])
{
int i;
char *src;
for (i = 0; i < argc; i++) {
*ptr++ = '"';
src = argv[i];
while(*src) {
if (*src == '"' || *src == '\\') {
*ptr++ = '\\';
}
*ptr++ = *src++;
}
*ptr++ = '"';
*ptr++ = ' ';
}
return ptr;
}
/* This function takes a callback to be called after the creation of the child
process but before we block waiting for the child. Can be NULL. */
__attribute__((noreturn)) int run (char *exePath,
int numArgs1, char **args1,
int numArgs2, char **args2,
runCallback callback)
{
int i, cmdline_len;
char *new_cmdline, *ptr;
STARTUPINFO si;
PROCESS_INFORMATION pi;
ZeroMemory(&pi, sizeof(PROCESS_INFORMATION));
ZeroMemory(&si, sizeof(STARTUPINFO));
si.cb = sizeof(STARTUPINFO);
/* Compute length of the flattened 'argv'. for each arg:
* + 1 for the space
* + chars * 2 (accounting for possible escaping)
* + 2 for quotes
*/
cmdline_len = 1 + strlen(exePath)*2 + 2;
for (i=0; i < numArgs1; i++) {
cmdline_len += 1 + strlen(args1[i])*2 + 2;
}
for (i=0; i < numArgs2; i++) {
cmdline_len += 1 + strlen(args2[i])*2 + 2;
}
new_cmdline = (char*)malloc(sizeof(char) * (cmdline_len + 1));
if (!new_cmdline) {
die("failed to start up %s; insufficient memory", exePath);
}
ptr = flattenAndQuoteArgs(new_cmdline, 1, &exePath);
ptr = flattenAndQuoteArgs(ptr, numArgs1, args1);
ptr = flattenAndQuoteArgs(ptr, numArgs2, args2);
*--ptr = '\0'; // replace the final space with \0
/* Note: Used to use _spawnv(_P_WAIT, ...) here, but it suffered
from the parent intercepting console events such as Ctrl-C,
which it shouldn't. Installing an ignore-all console handler
didn't do the trick either.
Irrespective of this issue, using CreateProcess() is preferable,
as it makes this wrapper work on both mingw and cygwin.
*/
#if 0
fprintf(stderr, "Invoking %s\n", new_cmdline); fflush(stderr);
#endif
if (!CreateProcess(exePath,
new_cmdline,
NULL,
NULL,
TRUE,
0, /* dwCreationFlags */
NULL, /* lpEnvironment */
NULL, /* lpCurrentDirectory */
&si, /* lpStartupInfo */
&pi) ) {
die("Unable to start %s (error code: %lu)\n", exePath, GetLastError());
}
/* Synchronize input and wait for target to be ready. */
WaitForInputIdle(pi.hProcess, INFINITE);
/* If we have a registered callback then call it before we block. */
if (callback)
callback();
switch (WaitForSingleObject(pi.hProcess, INFINITE) ) {
case WAIT_OBJECT_0:
{
DWORD pExitCode;
if (GetExitCodeProcess(pi.hProcess, &pExitCode) == 0) {
exit(1);
}
exit(pExitCode);
}
case WAIT_ABANDONED:
case WAIT_FAILED:
/* in the event we get any hard errors, bring the child to a halt. */
TerminateProcess(pi.hProcess,1);
exit(1);
default:
exit(1);
}
}
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