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1 | /* |
2 | * os_win32/popen_win32.cpp | |
3 | * | |
4 | * Home page of code is: https://www.smartmontools.org | |
5 | * | |
6 | * Copyright (C) 2018 Christian Franke | |
7 | * | |
8 | * SPDX-License-Identifier: GPL-2.0-or-later | |
9 | */ | |
10 | ||
11 | #include "popen.h" | |
12 | ||
13 | const char * popen_win32_cpp_cvsid = "$Id: popen_win32.cpp 4818 2018-10-17 05:32:17Z chrfranke $" | |
14 | POPEN_H_CVSID; | |
15 | ||
16 | #include <errno.h> | |
17 | #include <fcntl.h> | |
18 | #include <io.h> // _open_osfhandle() | |
19 | #include <signal.h> // SIGSEGV | |
20 | #include <stdlib.h> | |
21 | #include <string.h> | |
22 | ||
23 | #define WIN32_LEAN_AND_MEAN | |
24 | #include <windows.h> | |
25 | ||
26 | static FILE * s_popen_file; | |
27 | static HANDLE s_popen_process; | |
28 | ||
29 | extern "C" | |
30 | FILE * popen(const char * command, const char * mode) | |
31 | { | |
32 | // Fail if previous run is still in progress | |
33 | if (s_popen_file) { | |
34 | errno = EEXIST; | |
35 | return (FILE *)0; | |
36 | } | |
37 | ||
38 | // mode "w" is not implemented | |
39 | if (!(mode[0] == 'r' && (!mode[1] || !mode[2]))) { | |
40 | errno = EINVAL; | |
41 | return (FILE *)0; | |
42 | } | |
43 | ||
44 | // Set flags for text or binary mode | |
45 | // Note: _open_osfhandle() ignores _fmode and defaults to O_BINARY | |
46 | int oflags; const char * fomode; | |
47 | switch (mode[1]) { | |
48 | case 0: | |
49 | case 't': | |
50 | oflags = O_RDONLY|O_TEXT; | |
51 | fomode = "rt"; | |
52 | break; | |
53 | case 'b': | |
54 | oflags = O_RDONLY|O_BINARY; | |
55 | fomode = "rb"; | |
56 | break; | |
57 | default: | |
58 | errno = EINVAL; | |
59 | return (FILE *)0; | |
60 | } | |
61 | ||
62 | // Create stdout pipe with inheritable write end | |
63 | HANDLE pipe_out_r, pipe_out_w; | |
64 | if (!CreatePipe(&pipe_out_r, &pipe_out_w, (SECURITY_ATTRIBUTES *)0, 1024)) { | |
65 | errno = EMFILE; | |
66 | return (FILE *)0; | |
67 | } | |
68 | if (!SetHandleInformation(pipe_out_w, HANDLE_FLAG_INHERIT, HANDLE_FLAG_INHERIT)) { | |
69 | CloseHandle(pipe_out_r); CloseHandle(pipe_out_w); | |
70 | errno = EMFILE; | |
71 | return (FILE *)0; | |
72 | } | |
73 | ||
74 | // Connect pipe read end to new FD | |
75 | int fd = _open_osfhandle((intptr_t)pipe_out_r, oflags); | |
76 | if (fd < 0) { | |
77 | CloseHandle(pipe_out_r); CloseHandle(pipe_out_w); | |
78 | return (FILE *)0; | |
79 | } | |
80 | ||
81 | // Connect FD to new FILE | |
82 | FILE * f = fdopen(fd, fomode); | |
83 | if (!f) { | |
84 | int err = errno; | |
85 | close(fd); // CloseHandle(pipe_out_r) | |
86 | CloseHandle(pipe_out_w); | |
87 | errno = err; | |
88 | return (FILE *)0; | |
89 | } | |
90 | ||
91 | // Build command line "cmd /c COMMAND" | |
92 | int cmdlen = strlen(command); | |
93 | char * shellcmd = (char *)malloc(7 + cmdlen + 1); | |
94 | if (!shellcmd) { | |
95 | fclose(f); // CloseHandle(pipe_out_r) | |
96 | CloseHandle(pipe_out_w); | |
97 | errno = ENOMEM; | |
98 | return (FILE *)0; | |
99 | } | |
100 | memcpy(shellcmd, "cmd /c ", 7); | |
101 | memcpy(shellcmd + 7, command, cmdlen + 1); | |
102 | ||
103 | // Redirect stdin stderr to null device | |
104 | // Don't inherit parent's stdin, script may hang if parent has no console. | |
105 | SECURITY_ATTRIBUTES sa_inherit = { sizeof(sa_inherit), (SECURITY_DESCRIPTOR *)0, TRUE }; | |
106 | HANDLE null_in = CreateFile("nul", GENERIC_READ , 0, &sa_inherit, OPEN_EXISTING, 0, (HANDLE)0); | |
107 | HANDLE null_err = CreateFile("nul", GENERIC_WRITE, 0, &sa_inherit, OPEN_EXISTING, 0, (HANDLE)0); | |
108 | ||
109 | // Set stdio handles | |
110 | STARTUPINFO si; memset(&si, 0, sizeof(si)); si.cb = sizeof(si); | |
111 | si.hStdInput = null_in; | |
112 | si.hStdOutput = pipe_out_w; | |
113 | si.hStdError = null_err; | |
114 | si.dwFlags = STARTF_USESTDHANDLES; | |
115 | ||
116 | // Create process | |
117 | PROCESS_INFORMATION pi; | |
118 | BOOL ok = CreateProcessA( | |
119 | getenv("COMSPEC"), // "C:\WINDOWS\system32\cmd.exe" or nullptr | |
120 | shellcmd, // "cmd /c COMMAND" ("cmd" searched in PATH if COMSPEC not set) | |
121 | (SECURITY_ATTRIBUTES *)0, (SECURITY_ATTRIBUTES *)0, | |
122 | TRUE, // inherit | |
123 | CREATE_NO_WINDOW, // DETACHED_PROCESS would open new console(s) | |
124 | (void *)0, (char *)0, &si, &pi | |
125 | ); | |
126 | free(shellcmd); | |
127 | ||
128 | // Close inherited handles | |
129 | CloseHandle(null_err); | |
130 | CloseHandle(null_in); | |
131 | CloseHandle(pipe_out_w); | |
132 | ||
133 | if (!ok) { | |
134 | fclose(f); // CloseHandle(pipe_out_r) | |
135 | errno = ENOENT; | |
136 | return (FILE *)0; | |
137 | } | |
138 | ||
139 | // Store process and FILE for pclose() | |
140 | CloseHandle(pi.hThread); | |
141 | s_popen_process = pi.hProcess; | |
142 | s_popen_file = f; | |
143 | ||
144 | return f; | |
145 | } | |
146 | ||
147 | extern "C" | |
148 | int pclose(FILE * f) | |
149 | { | |
150 | if (f != s_popen_file) { | |
151 | errno = EBADF; | |
152 | return -1; | |
153 | } | |
154 | ||
155 | fclose(f); | |
156 | s_popen_file = 0; | |
157 | ||
158 | // Wait for process exitcode | |
159 | DWORD exitcode = 42; | |
160 | bool ok = ( WaitForSingleObject(s_popen_process, INFINITE) == WAIT_OBJECT_0 | |
161 | && GetExitCodeProcess(s_popen_process, &exitcode)); | |
162 | ||
163 | CloseHandle(s_popen_process); | |
164 | s_popen_process = 0; | |
165 | ||
166 | if (!ok) { | |
167 | errno = ECHILD; | |
168 | return -1; | |
169 | } | |
170 | ||
171 | // Modify exitcode for wait(3) macros | |
172 | if (exitcode >> 23) | |
173 | return ((exitcode << 9) >> 1) | SIGSEGV; | |
174 | else | |
175 | return exitcode << 8; | |
176 | } |