1 // This is part of the iostream library, providing input/output for C++. 2 // Copyright (C) 1992 Per Bothner. 3 // 4 // This library is free software; you can redistribute it and/or 5 // modify it under the terms of the GNU Library General Public 6 // License as published by the Free Software Foundation; either 7 // version 2 of the License, or (at your option) any later version. 8 // 9 // This library is distributed in the hope that it will be useful, 10 // but WITHOUT ANY WARRANTY; without even the implied warranty of 11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 // Library General Public License for more details. 13 // 14 // You should have received a copy of the GNU Library General Public 15 // License along with this library; if not, write to the Free 16 // Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 17 18 #ifdef notdef 19 #define _POSIX_SOURCE 20 #endif 21 #include "ioprivate.h" 22 #include "procbuf.h" 23 #include <signal.h> 24 #include <unistd.h> 25 #include <sys/wait.h> 26 27 28 #ifndef FORK 29 #define FORK vfork 30 #endif 31 32 procbuf::procbuf(const char *command, int mode) : filebuf() 33 { 34 open(command, mode); 35 } 36 37 procbuf *procbuf::open(const char *command, int mode) 38 { 39 int read_or_write; 40 if (is_open()) 41 return NULL; 42 int pipe_fds[2]; 43 int parent_end, child_end; 44 if (::pipe(pipe_fds) < 0) 45 return NULL; 46 if (mode == ios::in) { 47 parent_end = pipe_fds[0]; 48 child_end = pipe_fds[1]; 49 read_or_write = _S_NO_WRITES; 50 } 51 else { 52 parent_end = pipe_fds[1]; 53 child_end = pipe_fds[0]; 54 read_or_write = _S_NO_READS; 55 } 56 _pid = FORK(); 57 if (_pid == 0) { 58 ::close(parent_end); 59 int child_std_end = mode == ios::in ? 1 : 0; 60 if (child_end != child_std_end) { 61 ::dup2(child_end, child_std_end); 62 ::close(child_end); 63 } 64 ::execl("/bin/sh", "sh", "-c", command, NULL); 65 ::_exit(127); 66 } 67 ::close(child_end); 68 if (_pid < 0) { 69 ::close(parent_end); 70 return NULL; 71 } 72 _fb._fileno = parent_end; 73 xsetflags(read_or_write, _S_NO_READS|_S_NO_WRITES); 74 return this; 75 } 76 77 /* #define USE_SIGMASK */ 78 79 int procbuf::sys_close() 80 { 81 _G_pid_t wait_pid; 82 int status = filebuf::sys_close(); 83 if (status < 0) 84 return status; 85 int wstatus; 86 #if defined(SIG_BLOCK) && defined(SIG_SETMASK) 87 sigset_t set, oset; 88 sigemptyset (&set); 89 sigaddset (&set, SIGINT); 90 sigaddset (&set, SIGQUIT); 91 sigaddset (&set, SIGHUP); 92 sigprocmask (SIG_BLOCK, &set, &oset); 93 #else 94 #ifdef USE_SIGMASK 95 int mask = sigblock(sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGHUP)); 96 #else 97 typedef void (*void_func)(int); 98 void_func intsave = (void_func)signal(SIGINT, SIG_IGN); 99 void_func quitsave = (void_func)signal(SIGQUIT, SIG_IGN); 100 void_func hupsave = (void_func)signal(SIGHUP, SIG_IGN); 101 #endif 102 #endif 103 while ((wait_pid = wait(&wstatus)) != _pid && wait_pid != -1) { } 104 #if defined(SIG_BLOCK) && defined(SIG_SETMASK) 105 sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL); 106 #else 107 #ifdef USE_SIGMASK 108 (void) sigsetmask(mask); 109 #else 110 signal(SIGINT, intsave); 111 signal(SIGQUIT, quitsave); 112 signal(SIGHUP, hupsave); 113 #endif 114 #endif 115 if (wait_pid == -1) 116 return -1; 117 return 0; 118 } 119 120 procbuf::~procbuf() 121 { 122 close(); 123 } 124