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- // This is part of the iostream library, providing input/output for C++.
- // Copyright (C) 1992 Per Bothner.
- //
- // This library is free software; you can redistribute it and/or
- // modify it under the terms of the GNU Library General Public
- // License as published by the Free Software Foundation; either
- // version 2 of the License, or (at your option) any later version.
- //
- // This library is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- // Library General Public License for more details.
- //
- // You should have received a copy of the GNU Library General Public
- // License along with this library; if not, write to the Free
- // Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- #define _POSIX_SOURCE
- #include <ioprivat.h>
- #include <procbuf.h>
- #include <signal.h>
- #include <unistd.h>
- #include <sys/wait.h>
-
-
- #ifndef FORK
- #define FORK vfork
- extern "C" _G_pid_t vfork(void);
- #endif
-
- procbuf::procbuf(const char *command, int mode) : filebuf()
- {
- open(command, mode);
- }
-
- #ifdef atarist
- extern "C" int __mint;
- #endif
-
- procbuf *procbuf::open(const char *command, int mode)
- {
- #ifdef atarist
- if(!__mint) return NULL;
- #endif
- int read_or_write;
- if (is_open())
- return NULL;
- int pipe_fds[2];
- int parent_end, child_end;
- if (::pipe(pipe_fds) < 0)
- return NULL;
- if (mode == ios::in) {
- parent_end = pipe_fds[0];
- child_end = pipe_fds[1];
- read_or_write = _S_NO_WRITES;
- }
- else {
- parent_end = pipe_fds[1];
- child_end = pipe_fds[0];
- read_or_write = _S_NO_READS;
- }
- _pid = FORK();
- if (_pid == 0) {
- ::close(parent_end);
- int child_std_end = mode == ios::in ? 1 : 0;
- if (child_end != child_std_end) {
- ::dup2(child_end, child_std_end);
- ::close(child_end);
- }
- #ifdef atarist
- ::execvp(command, NULL);
- #else
- ::execl("/bin/sh", "sh", "-c", command, NULL);
- #endif
- ::_exit(127);
- }
- ::close(child_end);
- if (_pid < 0) {
- ::close(parent_end);
- return NULL;
- }
- _fb._fileno = parent_end;
- xsetflags(read_or_write, _S_NO_READS|_S_NO_WRITES);
- return this;
- }
-
- /* #define USE_SIGMASK */
-
- int procbuf::sys_close()
- {
- _G_pid_t wait_pid;
- #ifdef atarist
- if(!__mint) return -1;
- #endif
- int status = filebuf::sys_close();
- if (status < 0)
- return status;
- int wstatus;
- #if defined(SIG_BLOCK) && defined(SIG_SETMASK)
- sigset_t set, oset;
- sigemptyset (&set);
- sigaddset (&set, SIGINT);
- sigaddset (&set, SIGQUIT);
- sigaddset (&set, SIGHUP);
- sigprocmask (SIG_BLOCK, &set, &oset);
- #else
- #ifdef USE_SIGMASK
- int mask = sigblock(sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGHUP));
- #else
- typedef void (*void_func)(int);
- void_func intsave = (void_func)signal(SIGINT, SIG_IGN);
- void_func quitsave = (void_func)signal(SIGQUIT, SIG_IGN);
- void_func hupsave = (void_func)signal(SIGHUP, SIG_IGN);
- #endif
- #endif
- while ((wait_pid = wait(&wstatus)) != _pid && wait_pid != -1) { }
- #if defined(SIG_BLOCK) && defined(SIG_SETMASK)
- sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
- #else
- #ifdef USE_SIGMASK
- (void) sigsetmask(mask);
- #else
- signal(SIGINT, intsave);
- signal(SIGQUIT, quitsave);
- signal(SIGHUP, hupsave);
- #endif
- #endif
- if (wait_pid == -1)
- return -1;
- return 0;
- }
-
- procbuf::~procbuf()
- {
- close();
- }
-