cpython-withatomic / Modules / fcntlmodule.c

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/***********************************************************
Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
The Netherlands.

                        All Rights Reserved

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******************************************************************/

/* fcntl module */

#include "allobjects.h"
#include "modsupport.h"


/* fcntl(fd, opt, [arg]) */

static object *
fcntl_fcntl(self, args)
	object *self; /* Not used */
	object *args;
{
	int fd;
	int code;
	int arg;
	int ret;
	char *str;
	int len;
	char buf[1024];

	if (getargs(args, "(iis#)", &fd, &code, &str, &len)) {
		if (len > sizeof buf) {
			err_setstr(ValueError, "fcntl string arg too long");
			return NULL;
		}
		memcpy(buf, str, len);
		BGN_SAVE
		ret = fcntl(fd, code, buf);
		END_SAVE
		if (ret < 0) {
			err_errno(IOError);
			return NULL;
		}
		return newsizedstringobject(buf, len);
	}

	err_clear();
	if (getargs(args, "(ii)", &fd, &code))
		arg = 0;
	else {
		err_clear();
		if (!getargs(args, "(iii)", &fd, &code, &arg))
			return NULL;
	}
	BGN_SAVE
	ret = fcntl(fd, code, arg);
	END_SAVE
	if (ret < 0) {
		err_errno(IOError);
		return NULL;
	}
	return newintobject((long)ret);
}


/* ioctl(fd, opt, [arg]) */

static object *
fcntl_ioctl(self, args)
	object *self; /* Not used */
	object *args;
{
	int fd;
	int code;
	int arg;
	int ret;
	char *str;
	int len;
	char buf[1024];

	if (getargs(args, "(iis#)", &fd, &code, &str, &len)) {
		if (len > sizeof buf) {
			err_setstr(ValueError, "ioctl string arg too long");
			return NULL;
		}
		memcpy(buf, str, len);
		BGN_SAVE
		ret = ioctl(fd, code, buf);
		END_SAVE
		if (ret < 0) {
			err_errno(IOError);
			return NULL;
		}
		return newsizedstringobject(buf, len);
	}

	err_clear();
	if (getargs(args, "(ii)", &fd, &code))
		arg = 0;
	else {
		err_clear();
		if (!getargs(args, "(iii)", &fd, &code, &arg))
			return NULL;
	}
	BGN_SAVE
	ret = ioctl(fd, code, arg);
	END_SAVE
	if (ret < 0) {
		err_errno(IOError);
		return NULL;
	}
	return newintobject((long)ret);
}


/* List of functions */

static struct methodlist fcntl_methods[] = {
	{"fcntl",	fcntl_fcntl},
	{"ioctl",	fcntl_ioctl},
	{NULL,		NULL}		/* sentinel */
};


/* Module initialisation */

void
initfcntl()
{
	object *m, *d;

	/* Create the module and add the functions */
	m = initmodule("fcntl", fcntl_methods);

	/* Add some symbolic constants to the module */
	d = getmoduledict(m);

	/* Check for errors */
	if (err_occurred())
		fatal("can't initialize module fcntl");
}
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