win32: reimplement procps_scan()

On Linux, procps_scan() relies on /proc, which is obviously
unavailable on Windows.

This implementation currently supports procps_status_t.{pid,comm} only.

1 files changed, 33 insertions, 0 deletions

diff --git a/win32/process.c b/win32/process.c
index 13bf81797..1b9b61878 100644
--- a/win32/process.c
+++ b/win32/process.c
@@ -1,4 +1,5 @@
 #include "libbb.h"
+#include <tlhelp32.h>
 
 int waitpid(pid_t pid, int *status, unsigned options)
 {
@@ -284,3 +285,35 @@ mingw_execv(const char *cmd, const char *const *argv)
 {
         return mingw_execve(cmd, argv, (const char *const *)environ);
 }
+
+/* POSIX version in libbb/procps.c */
+procps_status_t* FAST_FUNC procps_scan(procps_status_t* sp, int flags)
+{
+        PROCESSENTRY32 pe;
+
+        pe.dwSize = sizeof(pe);
+        if (!sp) {
+                sp = xzalloc(sizeof(struct procps_status_t));
+                sp->snapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
+                if (sp->snapshot == INVALID_HANDLE_VALUE) {
+                        free(sp);
+                        return NULL;
+                }
+                if (!Process32First(sp->snapshot, &pe)) {
+                        CloseHandle(sp->snapshot);
+                        free(sp);
+                        return NULL;
+                }
+        }
+        else {
+                if (!Process32Next(sp->snapshot, &pe)) {
+                        CloseHandle(sp->snapshot);
+                        free(sp);
+                        return NULL;
+                }
+        }
+
+        sp->pid = pe.th32ProcessID;
+        strncpy(sp->comm, pe.szExeFile, COMM_LEN);
+        return sp;
+}