124 lines
3.8 KiB
C
124 lines
3.8 KiB
C
// posix_proc.c - posix_spawn, waitpid, getpid
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#include <stddef.h>
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#include <string.h>
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#include <syscall.h>
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#include "posix.h"
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#include "posix_path.h"
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// pid -> proc handle table (user-mode side, for waitpid)
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#define PROC_TABLE_SIZE 32
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typedef struct {
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pid_t pid;
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uint32_t handle;
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bool used;
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} ProcEntry;
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static ProcEntry gProcTable[PROC_TABLE_SIZE];
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static void ProcTableInsert(pid_t pid, uint32_t handle) {
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for (int i = 0; i < PROC_TABLE_SIZE; i++) {
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if (!gProcTable[i].used) {
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gProcTable[i] = (ProcEntry){ pid, handle, true };
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return;
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}
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}
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SysCloseHandle(handle);
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}
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static uint32_t ProcTableFind(pid_t pid) {
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for (int i = 0; i < PROC_TABLE_SIZE; i++)
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if (gProcTable[i].used && gProcTable[i].pid == pid)
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return gProcTable[i].handle;
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return 0;
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}
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static void ProcTableRemove(pid_t pid) {
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for (int i = 0; i < PROC_TABLE_SIZE; i++)
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if (gProcTable[i].used && gProcTable[i].pid == pid)
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gProcTable[i].used = false;
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}
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// Build a flat Windows-style cmdline from a NULL-terminated argv array.
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// Each token that contains a space is wrapped in double-quotes.
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// argv[0] is included (it becomes the executable token visible to _start).
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static void BuildCmdline(char* const argv[], char* out, size_t outSize) {
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size_t pos = 0;
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for (int i = 0; argv && argv[i]; i++) {
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if (i > 0 && pos < outSize - 1) out[pos++] = ' ';
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const char* tok = argv[i];
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bool needQuote = false;
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for (const char* c = tok; *c; c++) if (*c == ' ' || *c == '\t') { needQuote = true; break; }
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if (needQuote && pos < outSize - 1) out[pos++] = '"';
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for (; *tok && pos < outSize - 2; tok++) {
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if (*tok == '"') { out[pos++] = '\\'; }
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out[pos++] = *tok;
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}
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if (needQuote && pos < outSize - 1) out[pos++] = '"';
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}
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if (pos < outSize) out[pos] = '\0';
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}
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// ---------------------------------------------------------------------------
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// POSIX API
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// ---------------------------------------------------------------------------
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__declspec(dllexport) pid_t getpid(void) {
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return (pid_t)SysGetCurrentPid();
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}
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__declspec(dllexport) int posix_spawn(pid_t* pidOut,
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const char* path,
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const posix_spawn_file_actions_t* file_actions, // ignored v1
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const posix_spawnattr_t* attrp, // ignored v1
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char* const argv[],
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char* const envp[]) // ignored v1
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{
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(void)file_actions; (void)attrp; (void)envp;
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char native[512];
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PosixTranslatePath(path, native, sizeof(native));
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char cmdline[512];
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BuildCmdline(argv, cmdline, sizeof(cmdline));
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// If argv was NULL or empty, fall back to just the path so _start still
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// gets a meaningful argv[0].
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if (cmdline[0] == '\0') {
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size_t len = strlen(path);
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if (len >= sizeof(cmdline)) len = sizeof(cmdline) - 1;
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memcpy(cmdline, path, len);
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cmdline[len] = '\0';
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}
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uint32_t procHandle;
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uint32_t s = SysCreateProcess(native, &procHandle, cmdline);
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if (s != 0) { errno = ENOENT; return -1; }
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uint32_t kpid = 0;
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SysGetProcessPid(procHandle, &kpid);
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ProcTableInsert((pid_t)kpid, procHandle);
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if (pidOut) *pidOut = (pid_t)kpid;
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return 0;
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}
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// options: WNOHANG not supported in v1 (always blocks).
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__declspec(dllexport) pid_t waitpid(pid_t pid, int* status, int options) {
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(void)options;
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uint32_t handle = ProcTableFind(pid);
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if (!handle) { errno = ESRCH; return -1; }
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SysWaitForProcess(handle);
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int exitCode = 0;
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SysGetProcessExitCode(handle, &exitCode);
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if (status) *status = exitCode << 8; // WEXITSTATUS convention
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SysCloseHandle(handle);
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ProcTableRemove(pid);
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return pid;
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}
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__declspec(dllexport) void exit(int status) {
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SysExitProcess(status);
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}
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