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001 /* Unix pty slave program -- David Decotigny 2 001 /* Unix pty slave program -- David Decotigny 2005 002 License: GNU GPL version 2 002 License: GNU GPL version 2 003 Most of it taken from the GNU C library doc 003 Most of it taken from the GNU C library doc examples */ 004 #include <utmp.h> 004 #include <utmp.h> 005 #include <sys/types.h> 005 #include <sys/types.h> 006 #include <sys/stat.h> 006 #include <sys/stat.h> 007 #include <fcntl.h> 007 #include <fcntl.h> 008 #include <unistd.h> 008 #include <unistd.h> 009 #include <stdio.h> 009 #include <stdio.h> 010 #include <stdlib.h> 010 #include <stdlib.h> 011 #include <termios.h> 011 #include <termios.h> 012 012 013 /** 013 /** 014 * @file termslave.c 014 * @file termslave.c 015 * 015 * 016 * Linux pseudo-TTY slave program. To be used 016 * Linux pseudo-TTY slave program. To be used with "qemu -monitor pty" 017 * to access qemu's monitor from any linux ter 017 * to access qemu's monitor from any linux terminal. To use it, launch 018 * a "qemu -monitor pty" in one terminal, take 018 * a "qemu -monitor pty" in one terminal, take a look at the first 019 * line stating "char device redirected to /de 019 * line stating "char device redirected to /dev/pts/4" for example, 020 * and lauch the termslave program as "./terms 020 * and lauch the termslave program as "./termslave /dev/pts/4" in 021 * another terminal. 021 * another terminal. 022 * 022 * 023 * To make this correctly work, one has to app 023 * To make this correctly work, one has to apply the 024 * patch-qemu-pty.diff patch to qemu < 0.8.0 ( 024 * patch-qemu-pty.diff patch to qemu < 0.8.0 (qemu 0.8.0 and beyond 025 * already includes this patch). 025 * already includes this patch). 026 * 026 * 027 * This program also works with the "-serial p 027 * This program also works with the "-serial pty" flag of qemu. It can 028 * be used to send commands to the SOS serial- 028 * be used to send commands to the SOS serial-line shell (article 9). 029 */ 029 */ 030 030 031 031 032 /* Use this variable to remember original term 032 /* Use this variable to remember original terminal attributes. */ 033 struct termios saved_attributes; 033 struct termios saved_attributes; 034 034 035 static void 035 static void 036 reset_input_mode (void) 036 reset_input_mode (void) 037 { 037 { 038 tcsetattr (STDIN_FILENO, TCSANOW, &saved_att 038 tcsetattr (STDIN_FILENO, TCSANOW, &saved_attributes); 039 } 039 } 040 040 041 static void 041 static void 042 set_input_mode (void) 042 set_input_mode (void) 043 { 043 { 044 struct termios tattr; 044 struct termios tattr; 045 045 046 /* Make sure stdin is a terminal. */ 046 /* Make sure stdin is a terminal. */ 047 if (!isatty (STDIN_FILENO)) 047 if (!isatty (STDIN_FILENO)) 048 { 048 { 049 fprintf (stderr, "Not a terminal.\n"); 049 fprintf (stderr, "Not a terminal.\n"); 050 exit (EXIT_FAILURE); 050 exit (EXIT_FAILURE); 051 } 051 } 052 052 053 /* Save the terminal attributes so we can re 053 /* Save the terminal attributes so we can restore them later. */ 054 tcgetattr (STDIN_FILENO, &saved_attributes); 054 tcgetattr (STDIN_FILENO, &saved_attributes); 055 atexit (reset_input_mode); 055 atexit (reset_input_mode); 056 056 057 /* Set the funny terminal modes. */ 057 /* Set the funny terminal modes. */ 058 tcgetattr (STDIN_FILENO, &tattr); 058 tcgetattr (STDIN_FILENO, &tattr); 059 tattr.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTR 059 tattr.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP 060 |INLCR|IGNCR|ICRNL|IXON 060 |INLCR|IGNCR|ICRNL|IXON); 061 tattr.c_lflag &= ~(ICANON|ECHO); 061 tattr.c_lflag &= ~(ICANON|ECHO); 062 tattr.c_cflag |= CLOCAL; 062 tattr.c_cflag |= CLOCAL; 063 tattr.c_cc[VMIN] = 1; 063 tattr.c_cc[VMIN] = 1; 064 tattr.c_cc[VTIME] = 0; 064 tattr.c_cc[VTIME] = 0; 065 tcsetattr (STDIN_FILENO, TCSAFLUSH, &tattr); 065 tcsetattr (STDIN_FILENO, TCSAFLUSH, &tattr); 066 } 066 } 067 067 068 int main (int argc, char *argv[]) 068 int main (int argc, char *argv[]) 069 { 069 { 070 int term; 070 int term; 071 071 072 if (argc < 2) 072 if (argc < 2) 073 { 073 { 074 fprintf(stderr, "Usage: %s /dev/pts/numb 074 fprintf(stderr, "Usage: %s /dev/pts/number\n", argv[0]); 075 return -1; 075 return -1; 076 } 076 } 077 077 078 term = open(argv[1], O_RDWR); 078 term = open(argv[1], O_RDWR); 079 if (term < 0) 079 if (term < 0) 080 { 080 { 081 perror("open"); 081 perror("open"); 082 return -1; 082 return -1; 083 } 083 } 084 if (! isatty(term)) 084 if (! isatty(term)) 085 { 085 { 086 fprintf(stderr, "%s is not a valid termi 086 fprintf(stderr, "%s is not a valid terminal\n", argv[1]); 087 return -1; 087 return -1; 088 } 088 } 089 089 090 set_input_mode(); 090 set_input_mode(); 091 091 092 while (1) 092 while (1) 093 { 093 { 094 fd_set cur_set; 094 fd_set cur_set; 095 FD_ZERO(& cur_set); 095 FD_ZERO(& cur_set); 096 FD_SET(STDIN_FILENO, & cur_set); 096 FD_SET(STDIN_FILENO, & cur_set); 097 FD_SET(term, & cur_set); 097 FD_SET(term, & cur_set); 098 if (select(FD_SETSIZE, & cur_set, NULL, 098 if (select(FD_SETSIZE, & cur_set, NULL, NULL, NULL) < 1) 099 continue; 099 continue; 100 100 101 if (FD_ISSET(term, & cur_set)) 101 if (FD_ISSET(term, & cur_set)) 102 { 102 { 103 char buf[1024]; 103 char buf[1024]; 104 int len = read(term, buf, sizeof(buf 104 int len = read(term, buf, sizeof(buf)); 105 105 106 if (len >= 1) 106 if (len >= 1) 107 write(STDOUT_FILENO, buf, len); 107 write(STDOUT_FILENO, buf, len); 108 else 108 else 109 { 109 { 110 fprintf(stderr, "Master exitted\ 110 fprintf(stderr, "Master exitted\n"); 111 break; 111 break; 112 } 112 } 113 } 113 } 114 114 115 if (FD_ISSET(STDIN_FILENO, & cur_set)) 115 if (FD_ISSET(STDIN_FILENO, & cur_set)) 116 { 116 { 117 char c; 117 char c; 118 if (read(STDIN_FILENO, &c, 1) == 1) 118 if (read(STDIN_FILENO, &c, 1) == 1) 119 { 119 { 120 if (c == 0x4) /* ctrl-D */ 120 if (c == 0x4) /* ctrl-D */ 121 break; 121 break; 122 write(term, &c, 1); 122 write(term, &c, 1); 123 } 123 } 124 else 124 else 125 break; 125 break; 126 } 126 } 127 } 127 } 128 128 129 return 0; 129 return 0; 130 } 130 }
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