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82 lines
2.2 KiB
C++
82 lines
2.2 KiB
C++
/*******************************************************************************
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COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011, 2012.
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This program is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see <http://www.gnu.org/licenses/>.
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init.cpp
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Initializes the system by setting up the terminal and starting the shell.
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*******************************************************************************/
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#include <sys/wait.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <error.h>
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#include <fcntl.h>
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#include <unistd.h>
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int child()
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{
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const char* programname = "sh";
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const char* newargv[] = { programname, NULL };
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execvp(programname, (char* const*) newargv);
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error(0, errno, "%s", programname);
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return 2;
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}
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int runsystem()
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{
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pid_t childpid = fork();
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if ( childpid < 0 ) { perror("fork"); return 2; }
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if ( childpid )
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{
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int status;
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waitpid(childpid, &status, 0);
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// TODO: Use the proper macro!
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if ( 128 <= WEXITSTATUS(status) || WIFSIGNALED(status) )
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{
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printf("Looks like the system crashed, trying to bring it back up.\n");
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return runsystem();
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}
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return status;
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}
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int ret = child();
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while ( 0 < waitpid(-1, NULL, WNOHANG) );
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return ret;
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}
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int main(int /*argc*/, char* /*argv*/[])
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{
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if ( open("/dev/tty", O_RDONLY) != 0 ) { return 2; }
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if ( open("/dev/tty", O_WRONLY | O_APPEND) != 1 ) { return 2; }
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if ( open("/dev/tty", O_WRONLY | O_APPEND) != 2 ) { return 2; }
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// Reset the terminal's color and the rest of it.
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printf("\r\e[m\e[J");
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fflush(stdout);
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// By default, compile to the same architecture that the kernel told us that
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// we are running.
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setenv("objtype", getenv("cputype"), 0);
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return runsystem();
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}
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