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-rw-r--r--src/kash/shfork-win.c290
1 files changed, 290 insertions, 0 deletions
diff --git a/src/kash/shfork-win.c b/src/kash/shfork-win.c
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+
+
+/*******************************************************************************
+* Header Files *
+*******************************************************************************/
+#include <string.h>
+#include <locale.h>
+#include "shinstance.h"
+#include <Windows.h>
+
+/*******************************************************************************
+* Defined Constants And Macros *
+*******************************************************************************/
+/** The stack size. This is also defined in shforkA-win.asm. */
+#define SHFORK_STACK_SIZE (1*1024*1024)
+
+
+/*******************************************************************************
+* Global Variables *
+*******************************************************************************/
+static void *g_stack_base = 0;
+static void *g_stack_limit = 0;
+
+
+/*******************************************************************************
+* Internal Functions *
+*******************************************************************************/
+static void *shfork_string_to_ptr(const char *str, const char *argv0, const char *what);
+
+/* in shforkA-win.asm: */
+extern pid_t shfork_do_it(shinstance *psh);
+extern void shfork_resume(void *cur, void *base, void *limit);
+
+/* called by shforkA-win.asm: */
+void *shfork_maybe_forked(int argc, char **argv, char **envp);
+extern int shfork_body(shinstance *psh, void *stack_ptr);
+extern void init_syntax(void);
+
+
+/**
+ * Called by shforkA-win.asm to check whether we're a forked child
+ * process or not.
+ *
+ * In the former case we will resume execution at the fork resume
+ * point. In the latter we'll allocate a new stack of the forkable
+ * heap and return it to the caller so real_main() in main.c can be
+ * invoked on it.
+ *
+ * @returns Stack or not at all.
+ * @param argc Argument count.
+ * @param argv Argument vector.
+ * @param envp Environment vector.
+ */
+void *shfork_maybe_forked(int argc, char **argv, char **envp)
+{
+ void *stack_ptr;
+
+ /*
+ * Are we actually forking?
+ */
+ if ( argc != 8
+ || strcmp(argv[1], "--!forked!--")
+ || strcmp(argv[2], "--stack-address")
+ || strcmp(argv[4], "--stack-base")
+ || strcmp(argv[6], "--stack-limit"))
+ {
+ char *stack;
+ shheap_init(NULL);
+ g_stack_limit = stack = (char *)sh_malloc(NULL, SHFORK_STACK_SIZE);
+ g_stack_base = stack += SHFORK_STACK_SIZE;
+ return stack;
+ }
+
+ /*
+ * Do any init that needs to be done before resuming the
+ * fork() call.
+ */
+ setlocale(LC_ALL, "");
+
+ /*
+ * Convert the stack addresses.
+ */
+ stack_ptr = shfork_string_to_ptr(argv[3], argv[0], "--stack-address");
+ g_stack_base = shfork_string_to_ptr(argv[5], argv[0], "--stack-base");
+ g_stack_limit = shfork_string_to_ptr(argv[7], argv[0], "--stack-limit");
+ kHlpAssert((uintptr_t)stack_ptr < (uintptr_t)g_stack_base);
+ kHlpAssert((uintptr_t)stack_ptr > (uintptr_t)g_stack_limit);
+
+ /*
+ * Switch stack and jump to the fork resume point.
+ */
+ shfork_resume(stack_ptr, g_stack_base, g_stack_limit);
+ /* (won't get here) */
+ return NULL;
+}
+
+/***
+ * Converts a string into a pointer.
+ *
+ * @returns Pointer.
+ * @param argv0 The program name in case of error.
+ * @param str The string to convert.
+ */
+static void *shfork_string_to_ptr(const char *str, const char *argv0, const char *what)
+{
+ const char *start = str;
+ intptr_t ptr = 0;
+ if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
+ str += 2;
+ while (*str)
+ {
+ unsigned digit;
+ switch (*str)
+ {
+ case '0': digit = 0; break;
+ case '1': digit = 1; break;
+ case '2': digit = 2; break;
+ case '3': digit = 3; break;
+ case '4': digit = 4; break;
+ case '5': digit = 5; break;
+ case '6': digit = 6; break;
+ case '7': digit = 7; break;
+ case '8': digit = 8; break;
+ case '9': digit = 9; break;
+ case 'a': case 'A': digit = 0xa; break;
+ case 'b': case 'B': digit = 0xb; break;
+ case 'c': case 'C': digit = 0xc; break;
+ case 'd': case 'D': digit = 0xd; break;
+ case 'e': case 'E': digit = 0xe; break;
+ case 'f': case 'F': digit = 0xf; break;
+ default:
+ fprintf(stderr, "%s: fatal error: Invalid %s '%s'\n", argv0, what, start);
+ exit(2);
+ }
+ ptr <<= 4;
+ ptr |= digit;
+ str++;
+ }
+ return (void *)ptr;
+}
+
+/**
+ * Do the fork.
+ * @returns same as fork().
+ * @param psh The shell that's forking.
+ */
+int shfork_do(shinstance *psh)
+{
+ /* save globals */
+ void *pheap_head = shheap_get_head();
+ pid_t pid = shfork_do_it(psh);
+ if (pid == 0)
+ {
+ /* reinit stuff, only the heap is copied! */
+ shthread_set_shell(psh);
+ shheap_init(pheap_head);
+ setlocale(LC_ALL, "");
+ init_syntax();
+ sh_init_globals();
+ }
+ return pid;
+}
+
+/**
+ * Create the child process making sure it inherits all our handles,
+ * copy of the forkable heap and kick it off.
+ *
+ * Called by shfork_do_it() in shforkA-win.asm.
+ *
+ * @returns child pid on success, -1 and errno on failure.
+ * @param psh The shell that's forking.
+ * @param stack_ptr The stack address at which the guest is suppost to resume.
+ */
+int shfork_body(shinstance *psh, void *stack_ptr)
+{
+ PROCESS_INFORMATION ProcInfo;
+ STARTUPINFO StrtInfo;
+ intptr_t hndls[3];
+ char szExeName[1024];
+ char szCmdLine[1024+256];
+ DWORD cch;
+ int rc = 0;
+
+ kHlpAssert((uintptr_t)stack_ptr < (uintptr_t)g_stack_base);
+ kHlpAssert((uintptr_t)stack_ptr > (uintptr_t)g_stack_limit);
+
+ /*
+ * Mark all handles inheritable and get the three standard handles.
+ */
+ shfile_fork_win(&psh->fdtab, 1 /* set */, &hndls[0]);
+
+ /*
+ * Create the process.
+ */
+ cch = GetModuleFileName(GetModuleHandle(NULL), szExeName, sizeof(szExeName));
+ if (cch > 0)
+ {
+#if 0 /* quoting the program name doesn't seems to be working :/ */
+ szCmdLine[0] = '"';
+ memcpy(&szCmdLine[1], szExeName, cch);
+ szCmdLine[++cch] = '"';
+#else
+ memcpy(&szCmdLine[0], szExeName, cch);
+#endif
+ cch += sprintf(&szCmdLine[cch], " --!forked!-- --stack-address %p --stack-base %p --stack-limit %p",
+ stack_ptr, g_stack_base, g_stack_limit);
+ szCmdLine[cch+1] = '\0';
+ TRACE2((NULL, "shfork_body: szCmdLine=%s\n", szCmdLine));
+
+ memset(&StrtInfo, '\0', sizeof(StrtInfo)); /* just in case. */
+ StrtInfo.cb = sizeof(StrtInfo);
+ StrtInfo.lpReserved = NULL;
+ StrtInfo.lpDesktop = NULL;
+ StrtInfo.lpTitle = NULL;
+ StrtInfo.dwX = 0;
+ StrtInfo.dwY = 0;
+ StrtInfo.dwXSize = 0;
+ StrtInfo.dwYSize = 0;
+ StrtInfo.dwXCountChars = 0;
+ StrtInfo.dwYCountChars = 0;
+ StrtInfo.dwFillAttribute = 0;
+ StrtInfo.dwFlags = STARTF_USESTDHANDLES;;
+ StrtInfo.wShowWindow = 0;
+ StrtInfo.cbReserved2 = 0;
+ StrtInfo.lpReserved2 = NULL;
+ StrtInfo.hStdInput = (HANDLE)hndls[0];
+ StrtInfo.hStdOutput = (HANDLE)hndls[1];
+ StrtInfo.hStdError = (HANDLE)hndls[2];
+ if (CreateProcess(szExeName,
+ szCmdLine,
+ NULL, /* pProcessAttributes */
+ NULL, /* pThreadAttributes */
+ TRUE, /* bInheritHandles */
+ CREATE_SUSPENDED,
+ NULL, /* pEnvironment */
+ NULL, /* pCurrentDirectory */
+ &StrtInfo,
+ &ProcInfo))
+ {
+ /*
+ * Copy the memory to the child.
+ */
+ rc = shheap_fork_copy_to_child(ProcInfo.hProcess);
+ if (!rc)
+ {
+ if (ResumeThread(ProcInfo.hThread) != (DWORD)-1)
+ {
+ rc = sh_add_child(psh, ProcInfo.dwProcessId, ProcInfo.hProcess, NULL);
+ if (!rc)
+ rc = (int)ProcInfo.dwProcessId;
+ }
+ else
+ {
+ DWORD dwErr = GetLastError();
+ fprintf(stderr, "shfork: ResumeThread() -> %d\n", dwErr);
+ errno = EINVAL;
+ rc = -1;
+ }
+ }
+ if (rc == -1)
+ {
+ TerminateProcess(ProcInfo.hProcess, 127);
+ /* needed?: ResumeThread(ProcInfo.hThread); */
+ CloseHandle(ProcInfo.hProcess);
+ }
+ CloseHandle(ProcInfo.hThread);
+ }
+ else
+ {
+ DWORD dwErr = GetLastError();
+ fprintf(stderr, "shfork: CreateProcess(%s) -> %d\n", szExeName, dwErr);
+ errno = EINVAL;
+ rc = -1;
+ }
+ }
+ else
+ {
+ DWORD dwErr = GetLastError();
+ fprintf(stderr, "shfork: GetModuleFileName() -> %d\n", dwErr);
+ errno = EINVAL;
+ rc = -1;
+ }
+
+ /*
+ * Restore the handle inherit property.
+ */
+ shfile_fork_win(&psh->fdtab, 0 /* restore */, NULL);
+
+ return rc;
+}
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