user-0 提问: popen阻塞问题

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user: user-1
content: 再供参考：#include <stdio.h> #include <sys/types.h> #include <sys/wait.h> #include <unistd.h> pid_t rw_popen(char* cmd, FILE **rfile, FILE **wfile) {     int pipefd[2],pipefd2[2]; //管道描述符     pid_t pid; //进程描述符      if (pipe(pipefd) < 0) //建立管道     {         printf("rw_popen() pipe create error/n");         return 0;     }     if (pipe(pipefd2) < 0) //建立管道     {         printf("rw_popen() pipe create error/n");         return 0;     }      pid = fork(); //建立子进程      if (pid < 0)     return 0;      if (0 == pid) //子进程中     {         close(pipefd[0]);         dup2(pipefd[1], 1);         close(pipefd[1]);         dup2(pipefd2[0], 0);         close(pipefd2[0]);         close(pipefd[1]);         char *argv[] = { "/bin/sh", "-c", cmd, NULL };         if (execvp("/bin/sh", argv) < 0) //用exec族函数执行命令         exit(1);     }      close(pipefd[1]);     *rfile = fdopen(pipefd[0], "r");     close(pipefd2[0]);     *wfile = fdopen(pipefd2[1], "w");     return pid; } void rw_pclose(pid_t pid, FILE *rfile, FILE *wfile) {     int status;     waitpid(pid, &status, 0);     fclose(rfile);     fclose(wfile); } int main() {     char buf1[1024];     FILE *file1, *file2;     pid_t pid;     pid = rw_popen("sh", &file1, &file2);     if (pid) {         fputs("pwd;exit;\n",file2);         fflush(file2);         if (fgets(buf1, 1400, file1)) {             puts(buf1);         }         rw_pclose(pid, file1, file2);     }     return 1; }

user: user-1
content: 仅供参考：#pragma comment(lib,"user32") #include <stdio.h> #include <string.h> #include <windows.h> int main() {     SECURITY_ATTRIBUTES sa          = {0};     STARTUPINFO         si          = {0};     PROCESS_INFORMATION pi          = {0};     HANDLE              hPipeOutputRead  = NULL;     HANDLE              hPipeOutputWrite = NULL;     HANDLE              hPipeInputRead   = NULL;     HANDLE              hPipeInputWrite  = NULL;     BOOL                bTest = 0;     DWORD               dwNumberOfBytesRead = 0;     DWORD               dwNumberOfBytesWrite = 0;     CHAR                szMsg[100];     CHAR                szBuffer[256];      sa.nLength = sizeof(sa);     sa.bInheritHandle = TRUE;     sa.lpSecurityDescriptor = NULL;      // Create pipe for standard output redirection.     CreatePipe(&hPipeOutputRead,  // read handle             &hPipeOutputWrite, // write handle             &sa,      // security attributes             0      // number of bytes reserved for pipe - 0 default             );      // Create pipe for standard input redirection.     CreatePipe(&hPipeInputRead,  // read handle             &hPipeInputWrite, // write handle             &sa,      // security attributes             0      // number of bytes reserved for pipe - 0 default             );      // Make child process use hPipeOutputWrite as standard out,     // and make sure it does not show on screen.     si.cb = sizeof(si);     si.dwFlags     = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;     si.wShowWindow = SW_HIDE;     si.hStdInput   = hPipeInputRead;     si.hStdOutput  = hPipeOutputWrite;     si.hStdError   = hPipeOutputWrite;      CreateProcess (           NULL, "cmd.exe",           NULL, NULL,           TRUE, 0,           NULL, NULL,           &si, &pi);      // Now that handles have been inherited, close it to be safe.     // You don't want to read or write to them accidentally.     CloseHandle(hPipeOutputWrite);     CloseHandle(hPipeInputRead);      // Now test to capture DOS application output by reading     // hPipeOutputRead.  Could also write to DOS application     // standard input by writing to hPipeInputWrite.     sprintf(szMsg, "ver\n");     WriteFile(           hPipeInputWrite,      // handle of the write end of our pipe           &szMsg,               // address of buffer that send data           strlen(szMsg),        // number of bytes to write           &dwNumberOfBytesWrite,// address of number of bytes read           NULL                  // non-overlapped.           );      while(TRUE)     {        bTest=ReadFile(           hPipeOutputRead,      // handle of the read end of our pipe           &szBuffer,            // address of buffer that receives data           256,                  // number of bytes to read           &dwNumberOfBytesRead, // address of number of bytes read           NULL                  // non-overlapped.           );        if (!bTest){           sprintf(szMsg, "Error #%d reading pipe.",GetLastError());           printf("%s",szMsg);           break;       }        // do something with data.       szBuffer[dwNumberOfBytesRead] = 0;  // null terminate       printf("%s",szBuffer);       if ('>'==szBuffer[dwNumberOfBytesRead-1]) break;     }      sprintf(szMsg, "chcp\nexit\n");     WriteFile(           hPipeInputWrite,      // handle of the write end of our pipe           &szMsg,               // address of buffer that send data           strlen(szMsg),        // number of bytes to write           &dwNumberOfBytesWrite,// address of number of bytes read           NULL                  // non-overlapped.           );      while(TRUE)     {        bTest=ReadFile(           hPipeOutputRead,      // handle of the read end of our pipe           &szBuffer,            // address of buffer that receives data           256,                  // number of bytes to read           &dwNumberOfBytesRead, // address of number of bytes read           NULL                  // non-overlapped.           );        if (!bTest){           sprintf(szMsg, "Error #%d reading pipe.",GetLastError());           printf("%s",szMsg);           break;       }        // do something with data.       szBuffer[dwNumberOfBytesRead] = 0;  // null terminate       printf("%s",szBuffer);     }      // Wait for CONSPAWN to finish.     WaitForSingleObject (pi.hProcess, INFINITE);      // Close all remaining handles     CloseHandle (pi.hProcess);     CloseHandle (hPipeOutputRead);     CloseHandle (hPipeInputWrite);      return 0; } //C:\test>test //Microsoft Windows [版本 5.2.3790] //(C) 版权所有 1985-2003 Microsoft Corp. // //C:\test>ver // //Microsoft Windows [版本 5.2.3790] // //C:\test>chcp //活动的代码页: 936 // //C:\test>exit //Error #109 reading pipe. //C:\test>