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#include <fcntl.h>
#include "libbb.h"
typedef struct {
PROCESS_INFORMATION piProcInfo;
HANDLE in[2], out[2], err[2];
char mode;
FILE *fd;
} pipe_data;
static pipe_data *pipes = NULL;
static int num_pipes = 0;
static int mingw_pipe(HANDLE *readwrite)
{
SECURITY_ATTRIBUTES sa;
sa.nLength = sizeof(sa); /* Length in bytes */
sa.bInheritHandle = 1; /* the child must inherit these handles */
sa.lpSecurityDescriptor = NULL;
if ( !CreatePipe (&readwrite[0], &readwrite[1], &sa, 1 << 13) ) {
return -1;
}
return 0;
}
FILE *mingw_popen(const char *cmd, const char *mode)
{
int i;
pipe_data *p = NULL;
FILE *fptr = NULL;
STARTUPINFO siStartInfo;
int success;
int fd;
int len, count;
char *cmd_buff = NULL;
const char *s;
char *t;
if ( cmd == NULL || *cmd == '\0' || mode == NULL ||
(*mode != 'r' && *mode != 'w') ) {
return NULL;
}
/* find an unused pipe structure */
for ( i=0; i<num_pipes; ++i ) {
if ( pipes[i].mode == '\0' ) {
p = pipes+i;
break;
}
}
if ( p == NULL ) {
/* need to extend array */
if ( (p=realloc(pipes, sizeof(pipe_data)*(num_pipes+10))) == NULL ) {
return NULL;
}
pipes = p;
for ( i=0; i<10; ++i ) {
memset(pipes+num_pipes+i, 0, sizeof(pipe_data));
}
p = pipes + num_pipes;
num_pipes += 10;
}
/* count double quotes */
count = 0;
for ( s=cmd; *s; ++s ) {
if ( *s == '"' ) {
++count;
}
}
len = strlen(cmd) + 10 + count;
if ( (cmd_buff=malloc(len)) == NULL ) {
return NULL;
}
/* escape double quotes */
strcpy(cmd_buff, "sh -c \"");
for ( s=cmd,t=cmd_buff+strlen(cmd_buff); *s; ++s ) {
if ( *s == '"' ) {
*t++ = '\\';
}
*t++ = *s;
}
*t++ = '"';
*t = '\0';
p->in[0] = INVALID_HANDLE_VALUE;
p->in[1] = INVALID_HANDLE_VALUE;
p->out[0] = INVALID_HANDLE_VALUE;
p->out[1] = INVALID_HANDLE_VALUE;
p->err[0] = INVALID_HANDLE_VALUE;
p->err[1] = INVALID_HANDLE_VALUE;
/* Create the Pipes... */
if ( mingw_pipe(p->in) == -1 ||
mingw_pipe(p->out) == -1 ||
mingw_pipe(p->err) == -1) {
goto finito;
}
/* Make the parent ends of the pipes non-inheritable */
SetHandleInformation(p->in[1], HANDLE_FLAG_INHERIT, 0);
SetHandleInformation(p->out[0], HANDLE_FLAG_INHERIT, 0);
SetHandleInformation(p->err[0], HANDLE_FLAG_INHERIT, 0);
/* Now create the child process */
ZeroMemory(&siStartInfo, sizeof(STARTUPINFO));
siStartInfo.cb = sizeof(STARTUPINFO);
siStartInfo.hStdInput = p->in[0];
siStartInfo.hStdOutput = p->out[1];
siStartInfo.hStdError = p->err[1];
siStartInfo.dwFlags = STARTF_USESTDHANDLES;
success = CreateProcess(NULL,
(LPTSTR)cmd_buff, /* command line */
NULL, /* process security attributes */
NULL, /* primary thread security attributes */
TRUE, /* handles are inherited */
CREATE_NO_WINDOW, /* creation flags */
NULL, /* use parent's environment */
NULL, /* use parent's current directory */
&siStartInfo, /* STARTUPINFO pointer */
&p->piProcInfo); /* receives PROCESS_INFORMATION */
if ( !success ) {
goto finito;
}
/* Close the child ends of the pipes */
CloseHandle(p->in[0]); p->in[0] = INVALID_HANDLE_VALUE;
CloseHandle(p->out[1]); p->out[1] = INVALID_HANDLE_VALUE;
CloseHandle(p->err[1]); p->err[1] = INVALID_HANDLE_VALUE;
if ( *mode == 'r' ) {
fd = _open_osfhandle((long)p->out[0], _O_RDONLY|_O_BINARY);
fptr = _fdopen(fd, "rb");
}
else {
fd = _open_osfhandle((long)p->in[1], _O_WRONLY|_O_BINARY);
fptr = _fdopen(fd, "wb");
}
finito:
if ( !fptr ) {
if ( p->in[0] != INVALID_HANDLE_VALUE ) {
CloseHandle(p->in[0]);
}
if ( p->in[1] != INVALID_HANDLE_VALUE ) {
CloseHandle(p->in[1]);
}
if ( p->out[0] != INVALID_HANDLE_VALUE ) {
CloseHandle(p->out[0]);
}
if ( p->out[1] != INVALID_HANDLE_VALUE ) {
CloseHandle(p->out[1]);
}
if ( p->err[0] != INVALID_HANDLE_VALUE ) {
CloseHandle(p->err[0]);
}
if ( p->err[1] != INVALID_HANDLE_VALUE ) {
CloseHandle(p->err[1]);
}
}
else {
p->mode = *mode;
}
free(cmd_buff);
p->fd = fptr;
return fptr;
}
int mingw_pclose(FILE *fd)
{
int i;
pipe_data *p = NULL;
DWORD ret;
if ( fd == NULL ) {
return -1;
}
/* find struct containing fd */
for ( i=0; i<num_pipes; ++i ) {
if ( pipes[i].fd == fd ) {
p = pipes+i;
break;
}
}
if ( p == NULL ) {
/* no pipe data, maybe fd isn't a pipe? */
return -1;
}
fclose(fd);
CloseHandle(p->err[0]);
if ( p->mode == 'r' ) {
CloseHandle(p->in[1]);
}
else {
CloseHandle(p->out[0]);
}
ret = WaitForSingleObject(p->piProcInfo.hProcess, INFINITE);
CloseHandle(p->piProcInfo.hProcess);
CloseHandle(p->piProcInfo.hThread);
p->mode = '\0';
return (ret == WAIT_OBJECT_0) ? 0 : -1;
}
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