cpython/Modules/posixmodule.c

/* POSIX module implementation */

#include <stdio.h>
#include <signal.h>
#include <string.h>
#include <setjmp.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#ifdef SYSV
#include <dirent.h>
#define direct dirent
#else
#include <sys/dir.h>
#endif

#include "PROTO.h"
#include "object.h"
#include "intobject.h"
#include "stringobject.h"
#include "tupleobject.h"
#include "listobject.h"
#include "dictobject.h"
#include "methodobject.h"
#include "moduleobject.h"
#include "objimpl.h"
#include "import.h"
#include "sigtype.h"
#include "modsupport.h"
#include "errors.h"

extern char *strerror();

#ifdef AMOEBA
#define NO_LSTAT
#endif


/* Return a dictionary corresponding to the POSIX environment table */

extern char **environ;

static object *
convertenviron()
{
	object *d;
	char **e;
	d = newdictobject();
	if (d == NULL)
		return NULL;
	if (environ == NULL)
		return d;
	/* XXX This part ignores errors */
	for (e = environ; *e != NULL; e++) {
		object *v;
		char *p = strchr(*e, '=');
		if (p == NULL)
			continue;
		v = newstringobject(p+1);
		if (v == NULL)
			continue;
		*p = '\0';
		(void) dictinsert(d, *e, v);
		*p = '=';
		DECREF(v);
	}
	return d;
}


static object *PosixError; /* Exception posix.error */

/* Set a POSIX-specific error from errno, and return NULL */

static object *
posix_error()
{
	object *v = newtupleobject(2);
	if (v != NULL) {
		settupleitem(v, 0, newintobject((long)errno));
		settupleitem(v, 1, newstringobject(strerror(errno)));
	}
	err_setval(PosixError, v);
	if (v != NULL)
		DECREF(v);
	return NULL;
}


/* POSIX generic methods */

static object *
posix_1str(args, func)
	object *args;
	int (*func) FPROTO((const char *));
{
	object *path1;
	if (!getstrarg(args, &path1))
		return NULL;
	if ((*func)(getstringvalue(path1)) < 0)
		return posix_error();
	INCREF(None);
	return None;
}

static object *
posix_2str(args, func)
	object *args;
	int (*func) FPROTO((const char *, const char *));
{
	object *path1, *path2;
	if (!getstrstrarg(args, &path1, &path2))
		return NULL;
	if ((*func)(getstringvalue(path1), getstringvalue(path2)) < 0)
		return posix_error();
	INCREF(None);
	return None;
}

static object *
posix_strint(args, func)
	object *args;
	int (*func) FPROTO((const char *, int));
{
	object *path1;
	int i;
	if (!getstrintarg(args, &path1, &i))
		return NULL;
	if ((*func)(getstringvalue(path1), i) < 0)
		return posix_error();
	INCREF(None);
	return None;
}

static object *
posix_do_stat(self, args, statfunc)
	object *self;
	object *args;
	int (*statfunc) FPROTO((const char *, struct stat *));
{
	struct stat st;
	object *path;
	object *v;
	if (!getstrarg(args, &path))
		return NULL;
	if ((*statfunc)(getstringvalue(path), &st) != 0)
		return posix_error();
	v = newtupleobject(10);
	if (v == NULL)
		return NULL;
	errno = 0;
#define SET(i, st_member) settupleitem(v, i, newintobject((long)st.st_member))
	SET(0, st_mode);
	SET(1, st_ino);
	SET(2, st_dev);
	SET(3, st_nlink);
	SET(4, st_uid);
	SET(5, st_gid);
	SET(6, st_size);
	SET(7, st_atime);
	SET(8, st_mtime);
	SET(9, st_ctime);
#undef SET
	if (errno != 0) {
		DECREF(v);
		return err_nomem();
	}
	return v;
}


/* POSIX methods */

static object *
posix_chdir(self, args)
	object *self;
	object *args;
{
	extern int chdir PROTO((const char *));
	return posix_1str(args, chdir);
}

static object *
posix_chmod(self, args)
	object *self;
	object *args;
{
	extern int chmod PROTO((const char *, mode_t));
	return posix_strint(args, chmod);
}

static object *
posix_getcwd(self, args)
	object *self;
	object *args;
{
	char buf[1026];
	extern char *getcwd PROTO((char *, int));
	if (!getnoarg(args))
		return NULL;
	if (getcwd(buf, sizeof buf) == NULL)
		return posix_error();
	return newstringobject(buf);
}

static object *
posix_link(self, args)
	object *self;
	object *args;
{
	extern int link PROTO((const char *, const char *));
	return posix_2str(args, link);
}

static object *
posix_listdir(self, args)
	object *self;
	object *args;
{
	object *name, *d, *v;
	DIR *dirp;
	struct direct *ep;
	if (!getstrarg(args, &name))
		return NULL;
	if ((dirp = opendir(getstringvalue(name))) == NULL)
		return posix_error();
	if ((d = newlistobject(0)) == NULL) {
		closedir(dirp);
		return NULL;
	}
	while ((ep = readdir(dirp)) != NULL) {
		v = newstringobject(ep->d_name);
		if (v == NULL) {
			DECREF(d);
			d = NULL;
			break;
		}
		if (addlistitem(d, v) != 0) {
			DECREF(v);
			DECREF(d);
			d = NULL;
			break;
		}
		DECREF(v);
	}
	closedir(dirp);
	return d;
}

static object *
posix_mkdir(self, args)
	object *self;
	object *args;
{
	extern int mkdir PROTO((const char *, mode_t));
	return posix_strint(args, mkdir);
}

static object *
posix_rename(self, args)
	object *self;
	object *args;
{
	extern int rename PROTO((const char *, const char *));
	return posix_2str(args, rename);
}

static object *
posix_rmdir(self, args)
	object *self;
	object *args;
{
	extern int rmdir PROTO((const char *));
	return posix_1str(args, rmdir);
}

static object *
posix_stat(self, args)
	object *self;
	object *args;
{
	extern int stat PROTO((const char *, struct stat *));
	return posix_do_stat(self, args, stat);
}

static object *
posix_system(self, args)
	object *self;
	object *args;
{
	object *command;
	int sts;
	if (!getstrarg(args, &command))
		return NULL;
	sts = system(getstringvalue(command));
	return newintobject((long)sts);
}

static object *
posix_umask(self, args)
	object *self;
	object *args;
{
	int i;
	if (!getintarg(args, &i))
		return NULL;
	i = umask(i);
	if (i < 0)
		return posix_error();
	return newintobject((long)i);
}

static object *
posix_unlink(self, args)
	object *self;
	object *args;
{
	extern int unlink PROTO((const char *));
	return posix_1str(args, unlink);
}

static object *
posix_utimes(self, args)
	object *self;
	object *args;
{
	object *path;
	struct timeval tv[2];
	if (args == NULL || !is_tupleobject(args) || gettuplesize(args) != 2) {
		err_badarg();
		return NULL;
	}
	if (!getstrarg(gettupleitem(args, 0), &path) ||
				!getlonglongargs(gettupleitem(args, 1),
					&tv[0].tv_sec, &tv[1].tv_sec))
		return NULL;
	tv[0].tv_usec = tv[1].tv_usec = 0;
	if (utimes(getstringvalue(path), tv) < 0)
		return posix_error();
	INCREF(None);
	return None;
}

#ifdef NO_GETCWD

/* Quick hack to get posix.getcwd() working for pure BSD 4.3 */
/* XXX This assumes MAXPATHLEN = 1024 !!! */

static char *
getcwd(buf, size)
	char *buf;
	int size;
{
	extern char *getwd PROTO((char *));
	register char *ret = getwd(buf);
	if (ret == NULL)
		errno = EACCES; /* Most likely error */
	return ret;
}

#endif /* NO_GETCWD */


#ifndef NO_LSTAT

static object *
posix_lstat(self, args)
	object *self;
	object *args;
{
	extern int lstat PROTO((const char *, struct stat *));
	return posix_do_stat(self, args, lstat);
}

static object *
posix_readlink(self, args)
	object *self;
	object *args;
{
	char buf[1024]; /* XXX Should use MAXPATHLEN */
	object *path;
	int n;
	if (!getstrarg(args, &path))
		return NULL;
	n = readlink(getstringvalue(path), buf, sizeof buf);
	if (n < 0)
		return posix_error();
	return newsizedstringobject(buf, n);
}

static object *
posix_symlink(self, args)
	object *self;
	object *args;
{
	extern int symlink PROTO((const char *, const char *));
	return posix_2str(args, symlink);
}

#endif /* NO_LSTAT */


static struct methodlist posix_methods[] = {
	{"chdir",	posix_chdir},
	{"chmod",	posix_chmod},
	{"getcwd",	posix_getcwd},
	{"link",	posix_link},
	{"listdir",	posix_listdir},
	{"mkdir",	posix_mkdir},
	{"rename",	posix_rename},
	{"rmdir",	posix_rmdir},
	{"stat",	posix_stat},
	{"system",	posix_system},
	{"umask",	posix_umask},
	{"unlink",	posix_unlink},
	{"utimes",	posix_utimes},
#ifndef NO_LSTAT
	{"lstat",	posix_lstat},
	{"readlink",	posix_readlink},
	{"symlink",	posix_symlink},
#endif
	{NULL,		NULL}		 /* Sentinel */
};


void
initposix()
{
	object *m, *d, *v;
	
	m = initmodule("posix", posix_methods);
	d = getmoduledict(m);
	
	/* Initialize posix.environ dictionary */
	v = convertenviron();
	if (v == NULL || dictinsert(d, "environ", v) != 0)
		fatal("can't define posix.environ");
	DECREF(v);
	
	/* Initialize posix.error exception */
	PosixError = newstringobject("posix.error");
	if (PosixError == NULL || dictinsert(d, "error", PosixError) != 0)
		fatal("can't define posix.error");
}