Created
May 5, 2013 15:22
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Linux 伪终端demo
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| #define _XOPEN_SOURCE | |
| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <unistd.h> | |
| #include <fcntl.h> | |
| #include <string.h> | |
| #define BUFSIZE 1024 | |
| int main() | |
| { | |
| int ptm,sfd; | |
| char *slavedevice; | |
| if((ptm = open("/dev/ptmx", O_RDWR)) == -1) | |
| { | |
| perror("posix_openpt() error"); | |
| exit(-1); | |
| } | |
| fcntl(ptm, F_SETFD, FD_CLOEXEC); | |
| if(grantpt(ptm) == -1) | |
| { | |
| perror("grantpt() error"); | |
| exit(-1); | |
| } | |
| if(unlockpt(ptm) == -1) | |
| { | |
| perror("unlockpt() error"); | |
| exit(-1); | |
| } | |
| if((slavedevice=ptsname(ptm)) == NULL) | |
| { | |
| perror("ptsname() error"); | |
| exit(-1); | |
| } | |
| int pid = fork(); | |
| if( pid == 0 ) { | |
| close(ptm); | |
| setsid(); | |
| int pts = open(slavedevice, O_RDWR); | |
| if(pts < 0) exit(-1); | |
| dup2(pts, 0); | |
| dup2(pts, 1); | |
| dup2(pts, 2); | |
| execv("/bin/sh",NULL); | |
| exit(0); | |
| } | |
| int nread; | |
| char buf[BUFSIZE]; | |
| if( fork() == 0 ){ | |
| for(;;) | |
| { | |
| if( (nread=read(STDIN_FILENO,buf,BUFSIZE)) < 0 ){ | |
| perror("read"); | |
| break; | |
| } | |
| else if( nread == 0 ) | |
| break; | |
| if( write(ptm,buf,nread) != nread ){ | |
| perror("write"); | |
| break; | |
| } | |
| } | |
| } else { | |
| for(;;) | |
| { | |
| if( (nread = read(ptm,buf,BUFSIZE) ) <0 ) | |
| break; | |
| if( write (STDOUT_FILENO,buf,nread) != nread ){ | |
| perror("write"); | |
| break; | |
| } | |
| } | |
| } | |
| close(ptm); | |
| return 0; | |
| } |
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