mes/lib/linux.c

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/* -*-comment-start: "//";comment-end:""-*-
* Mes --- Maxwell Equations of Software
* Copyright © 2016,2017,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
*
* This file is part of Mes.
*
* Mes is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* Mes 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Mes. If not, see <http://www.gnu.org/licenses/>.
*/
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <libmes.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/wait.h>
#define SYS_fork 0x02
#define SYS_read 0x03
#define SYS_open 0x05
#define SYS_waitpid 0x07
#define SYS_execve 0x0b
#define SYS_chmod 0x0f
#define SYS_access 0x21
#define SYS_brk 0x2d
#define SYS_ioctl 0x36
#define SYS_fsync 0x76
int
fork ()
{
return _sys_call (SYS_fork);
}
ssize_t
read (int filedes, void *buffer, size_t size)
{
return _sys_call3 (SYS_read, (int)filedes, (int)buffer, (int)size);
}
int
open (char const *file_name, int flags, ...)
{
va_list ap;
va_start (ap, flags);
int mask = va_arg (ap, int);
#if !MES_BOOTSTRAP
if (!flags)
{
_ungetc_pos = -1;
_ungetc_fd = -1;
}
#endif
int r = _sys_call3 (SYS_open, (int)file_name, (int)flags, (int)mask);
va_end (ap);
return r;
}
pid_t
waitpid (pid_t pid, int *status_ptr, int options)
{
return _sys_call3 (SYS_waitpid, (int)pid, (int)status_ptr, (int)options);
}
int
execve (char const* file_name, char *const argv[], char *const env[])
{
return _sys_call3 (SYS_execve, (int)file_name, (int)argv, (int)env);
}
int
chmod (char const *file_name, mode_t mask)
{
return _sys_call2 (SYS_chmod, (int)file_name, (int)mask);
}
int
access (char const *file_name, int how)
{
return _sys_call2 (SYS_access, (int)file_name, (int)how);
}
int
brk (void *addr)
{
return _sys_call1 (SYS_brk, (int)addr);
}
int
ioctl (int filedes, unsigned long command, ...)
{
va_list ap;
va_start (ap, command);
int data = va_arg (ap, int);
int r = _sys_call3 (SYS_ioctl, (int)filedes, (int)command, (int)data);
va_end (ap);
return r;
}
int
fsync (int filedes)
{
return _sys_call1 (SYS_fsync, (int)filedes);
}