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#ifndef lint |
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static const char RCSid[] = "$Id: win_popen.c,v 1.3 2004/03/28 20:33:12 schorsch Exp $"; |
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#endif |
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/* |
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Replacement for the posix popen() on Windows |
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|
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We don't just let the shell do the work like the original. |
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Since per default there's no decent shell around, we implement |
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the most basic functionality right here. |
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|
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currently supports mode "r" and | to chain several processes. |
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Substrings between matching quotes are considered one word, |
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ignoring any | within. Quotes don't nest. |
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|
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*/ |
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|
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#include <windows.h> |
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <ctype.h> |
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#include <io.h> /* _open_osfhandle() */ |
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#include <fcntl.h> /* _O_RDONLY */ |
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|
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#include "paths.h" |
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#include "rtio.h" |
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#include "rterror.h" |
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|
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|
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#define RAD_MAX_PIPES 32 /* maximum number of pipes */ |
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|
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#define R_MODE 1 |
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#define W_MODE 2 |
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#define A_MODE 3 |
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|
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static int parse_pipes(char *s, char *lines[], char **infn, char **outfn, |
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int *append, int maxl); |
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static BOOL createPipes(HANDLE*, HANDLE*, HANDLE*, HANDLE*); |
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static BOOL runChild(char*, char*, HANDLE, HANDLE, HANDLE); |
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static void resetStdHandles(HANDLE stdoutOrig, HANDLE stdinOrig); |
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HANDLE newFile(char *fn, int mode); |
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|
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|
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int |
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win_pclose( /* posix pclose replacement */ |
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FILE* p |
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) |
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{ |
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fclose(p); |
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/* not sure if it's useful to wait for anything on Windows */ |
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return 0; |
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} |
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|
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|
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FILE * |
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win_popen( /* posix popen replacement */ |
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char* command, |
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char* type |
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) |
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{ |
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char *execfile, *args; |
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char *cmdlines[RAD_MAX_PIPES]; |
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char *infn = NULL, *outfn = NULL; |
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char executable[512], estr[512]; |
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int n, i, mode = 0, append = 0; |
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int ncmds = 0; |
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FILE *inf = NULL; |
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HANDLE stdoutRd = NULL, stdoutWr = NULL; |
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HANDLE stdinRd = NULL, stdinWr = NULL; |
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HANDLE stderrWr = NULL; |
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HANDLE stdoutOrig, stdinOrig; |
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|
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if (strchr(type, 'w')) { |
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mode = W_MODE; |
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} else if (strchr(type, 'r')) { |
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mode = R_MODE; |
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} else { |
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_snprintf(estr, sizeof(estr), |
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"Invalid mode \"%s\" for win_popen().", type); |
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eputs(estr); |
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return NULL; |
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} |
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|
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stdoutOrig = GetStdHandle(STD_OUTPUT_HANDLE); |
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stdinOrig = GetStdHandle(STD_INPUT_HANDLE); |
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/* if we have a console, use it for error output */ |
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stderrWr = GetStdHandle(STD_ERROR_HANDLE); |
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|
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ncmds = parse_pipes(command,cmdlines,&infn,&outfn,&append,RAD_MAX_PIPES); |
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if(ncmds <= 0) { |
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eputs("Too many pipes or malformed command."); |
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goto error; |
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} |
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|
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if (infn != NULL) { |
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stdoutRd = newFile(infn, mode); |
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} |
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|
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for(n = 0; n < ncmds; ++n) { |
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if(!createPipes(&stdoutRd, &stdoutWr, |
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&stdinRd, &stdinWr)) { |
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eputs("Error creating pipe"); |
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goto error; |
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} |
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if (outfn != NULL && n == ncmds - 1) { |
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CloseHandle(stdoutWr); |
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CloseHandle(stdoutRd); |
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stdoutWr = newFile(outfn, mode); |
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} |
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if (n == 0 && mode == W_MODE) { |
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/* create a standard C file pointer for writing to the input */ |
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inf = _fdopen(_open_osfhandle((long)stdinWr, _O_RDONLY), "w"); |
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} |
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/* find the executable on the PATH */ |
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args = nextword(executable, sizeof(executable), cmdlines[n]); |
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if (args == NULL) { |
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eputs("Empty command."); |
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goto error; |
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} |
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execfile = getpath(executable, getenv("PATH"), X_OK); |
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if(execfile == NULL) { |
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_snprintf(estr, sizeof(estr), |
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"Can't find executable for \"%s\".", executable); |
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eputs(estr); |
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goto error; |
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} |
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if(!runChild(execfile, cmdlines[n], stdinRd, stdoutWr, stderrWr)) { |
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_snprintf(estr, sizeof(estr), |
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"Unable to execute executable \"%s\".", executable); |
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eputs(estr); |
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goto error; |
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} |
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/* close the stdout end just passed to the last process, |
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or the final read will block */ |
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CloseHandle(stdoutWr); |
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} |
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|
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/* clean up */ |
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resetStdHandles(stdinOrig, stdoutOrig); |
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for (i = 0; i < ncmds; i++) free(cmdlines[i]); |
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if (infn != NULL) free(infn); |
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if (outfn != NULL) free(outfn); |
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|
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if (mode == R_MODE) { |
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/* return a standard C file pointer for reading the output */ |
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return _fdopen(_open_osfhandle((long)stdoutRd, _O_RDONLY), "r"); |
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} else if (mode == W_MODE) { |
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/* return a standard C file pointer for writing to the input */ |
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return inf; |
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} |
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|
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error: |
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resetStdHandles(stdinOrig, stdoutOrig); |
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for (i = 0; i < ncmds; i++) free(cmdlines[i]); |
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if (infn != NULL) free(infn); |
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if (outfn != NULL) free(outfn); |
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return NULL; |
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} |
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|
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|
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HANDLE |
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newFile(char *fn, int mode) |
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{ |
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SECURITY_ATTRIBUTES sAttr; |
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HANDLE fh; |
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|
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sAttr.nLength = sizeof(SECURITY_ATTRIBUTES); |
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sAttr.bInheritHandle = TRUE; |
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sAttr.lpSecurityDescriptor = NULL; |
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|
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if (mode == R_MODE) { |
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fh = CreateFile(fn, |
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GENERIC_READ, |
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FILE_SHARE_READ, |
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&sAttr, |
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OPEN_EXISTING, |
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FILE_ATTRIBUTE_NORMAL, |
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NULL); |
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} else if (mode == W_MODE || mode == A_MODE) { |
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fh = CreateFile(fn, |
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GENERIC_WRITE, |
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FILE_SHARE_WRITE, |
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&sAttr, |
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mode==W_MODE?CREATE_ALWAYS:OPEN_ALWAYS, |
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FILE_ATTRIBUTE_NORMAL, |
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NULL); |
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} |
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if (fh == NULL) { |
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int e = GetLastError(); |
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} |
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return fh; |
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} |
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|
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|
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static BOOL |
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createPipes( /* establish matching pipes for a subprocess */ |
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HANDLE* stdoutRd, |
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HANDLE* stdoutWr, |
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HANDLE* stdinRd, |
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HANDLE* stdinWr |
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) |
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{ |
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HANDLE stdoutRdInh = NULL; |
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HANDLE stdinWrInh = NULL; |
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HANDLE curproc; |
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SECURITY_ATTRIBUTES sAttr; |
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|
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curproc = GetCurrentProcess(); |
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|
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/* The rules of inheritance for handles are a mess. |
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Just to be safe, make all handles we pass to the |
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child processes inheritable */ |
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sAttr.nLength = sizeof(SECURITY_ATTRIBUTES); |
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sAttr.bInheritHandle = TRUE; |
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sAttr.lpSecurityDescriptor = NULL; |
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|
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if(*stdoutRd != NULL){ |
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/* if we have a previous stdout pipe, |
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assign the other end to stdin for the new process */ |
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CloseHandle(*stdinRd); |
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if(!DuplicateHandle(curproc, *stdoutRd, |
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curproc, stdinRd, 0, |
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TRUE, DUPLICATE_SAME_ACCESS)) |
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return FALSE; |
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CloseHandle(*stdoutRd); |
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if(!SetStdHandle(STD_INPUT_HANDLE, *stdinRd)) |
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return FALSE; |
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} else { |
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/* there's no previous stdout, create a new stdin pipe */ |
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if(!CreatePipe(stdinRd, &stdinWrInh, &sAttr, 0)) |
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return FALSE; |
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if(!SetStdHandle(STD_INPUT_HANDLE, *stdinRd)) |
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return FALSE; |
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CloseHandle(stdinWrInh); |
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} |
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|
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/* create the stdout pipe for the new process */ |
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if(!CreatePipe(&stdoutRdInh, stdoutWr, &sAttr, 0)) |
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return FALSE; |
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if(!SetStdHandle(STD_OUTPUT_HANDLE, *stdoutWr)) |
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return FALSE; |
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if(!DuplicateHandle(curproc, stdoutRdInh, |
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curproc, stdoutRd, 0, |
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FALSE, DUPLICATE_SAME_ACCESS)) |
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return FALSE; |
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CloseHandle(stdoutRdInh); |
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|
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return TRUE; |
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} |
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|
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|
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static void |
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resetStdHandles( /* clean up our std streams */ |
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HANDLE stdoutOrig, |
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HANDLE stdinOrig |
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) |
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{ |
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SetStdHandle(STD_OUTPUT_HANDLE, stdoutOrig); |
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SetStdHandle(STD_INPUT_HANDLE, stdinOrig); |
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} |
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|
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|
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static int |
264 |
parse_pipes( /* split a shell command pipe sequence */ |
265 |
char *s, |
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char *lines[], |
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char **infn, |
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char **outfn, |
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int *append, |
270 |
int maxl |
271 |
) |
272 |
{ |
273 |
int n = 0, i; |
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char *se, *ws; |
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char *curs; |
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int llen = 0; |
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int quote = 0; |
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int last = 0; |
279 |
|
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if (maxl<= 0) return 0; |
281 |
if (s == NULL) { |
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return 0; |
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} |
284 |
*infn = *outfn = NULL; |
285 |
while (isspace(*s)) s++; /* leading whitespace */ |
286 |
se = s; |
287 |
while (n < maxl) { |
288 |
switch (*se) { |
289 |
case '"': |
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if (quote == '"') quote = 0; |
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else if (quote == 0) quote = '"'; |
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break; |
293 |
case '\'': |
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if (quote == '\'') quote = 0; |
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else if (quote == 0) quote = '\''; |
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break; |
297 |
case '<': |
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case '>': |
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case '|': |
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case '\0': |
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if (*se != '\0' && quote) |
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break; |
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llen = se - s; |
304 |
curs = malloc(llen+1); |
305 |
strncpy(curs, s, llen); |
306 |
/* remove unix style line-end escapes */ |
307 |
while((ws = strstr(curs, "\\\n")) != NULL) |
308 |
*ws = *(ws+1) = ' '; |
309 |
/* remove DOS style line-end escapes */ |
310 |
while((ws = strstr(curs, "\\\r\n")) != NULL) |
311 |
*ws = *(ws+1) = *(ws+2) = ' '; |
312 |
while (isspace(*(curs + llen - 1))) |
313 |
llen--; /* trailing whitespace */ |
314 |
curs[llen] = '\0'; |
315 |
|
316 |
if (last == '|' || last == 0) { /* first or pipe */ |
317 |
lines[n] = curs; |
318 |
n++; |
319 |
curs = NULL; |
320 |
} else if (last == '<') { /* input file */ |
321 |
if (*infn != NULL) { |
322 |
eputs("win_popen(): ambiguous input redirection"); |
323 |
goto error; |
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} |
325 |
*infn = curs; |
326 |
curs = NULL; |
327 |
} else if (last == '>') { /* output file */ |
328 |
if (*outfn != NULL) { |
329 |
eputs("win_popen(): ambiguous output redirection"); |
330 |
goto error; |
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} |
332 |
*outfn = curs; |
333 |
curs = NULL; |
334 |
if (*se != '\0' && *se+1 == '>') { /* >> */ |
335 |
*append = 1; |
336 |
se++; |
337 |
} |
338 |
} |
339 |
last = *se; |
340 |
|
341 |
if (*se == '\0') return n; |
342 |
s = se + 1; |
343 |
while (isspace(*s)) s++; /* leading whitespace */ |
344 |
se = s; |
345 |
break; |
346 |
default: |
347 |
break; |
348 |
} |
349 |
se++; |
350 |
} |
351 |
/* more jobs than slots */ |
352 |
error: |
353 |
for (i = 0; i < n; i++) free(lines[i]); |
354 |
if (*infn != NULL) free(*infn); |
355 |
if (*outfn != NULL) free(*outfn); |
356 |
if (curs != NULL) free(curs); |
357 |
return -1; |
358 |
} |
359 |
|
360 |
|
361 |
static BOOL |
362 |
runChild( /* start a child process with the right std streams */ |
363 |
char* executable, |
364 |
char* cmdline, |
365 |
HANDLE stdinRd, |
366 |
HANDLE stdoutWr, |
367 |
HANDLE stderrWr |
368 |
) |
369 |
{ |
370 |
PROCESS_INFORMATION procInfo; |
371 |
STARTUPINFO startupInfo; |
372 |
|
373 |
/* use the given handles and don't display the console window */ |
374 |
ZeroMemory(&startupInfo, sizeof(STARTUPINFO)); |
375 |
startupInfo.cb = sizeof(STARTUPINFO); |
376 |
startupInfo.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW; |
377 |
startupInfo.wShowWindow = SW_HIDE; |
378 |
startupInfo.hStdInput = stdinRd; |
379 |
startupInfo.hStdOutput = stdoutWr; |
380 |
startupInfo.hStdError = stderrWr; |
381 |
|
382 |
return CreateProcess(executable, cmdline, NULL, NULL, |
383 |
TRUE, 0, |
384 |
NULL, NULL, &startupInfo, &procInfo); |
385 |
} |
386 |
|
387 |
|
388 |
|