78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
|
/* Scheme48/scsh Unix system interface.
|
||
|
|
** Routines that require custom C support.
|
||
|
|
** Copyright (c) 1995 by David Albertz.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* File locking routines */
|
||
|
|
|
||
|
|
#include <sys/types.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <fcntl.h>
|
||
|
|
#include <errno.h>
|
||
|
|
|
||
|
|
/* Make sure our exports match up w/the implementation: */
|
||
|
|
#include "scheme48.h"
|
||
|
|
#include "flock1.h"
|
||
|
|
|
||
|
|
s48_value set_lock(s48_value fd, s48_value cmd, s48_value type,
|
||
|
|
s48_value whence, s48_value start, s48_value len)
|
||
|
|
{
|
||
|
|
struct flock lock;
|
||
|
|
int retval;
|
||
|
|
lock.l_type = s48_extract_integer (type);
|
||
|
|
lock.l_whence = s48_extract_integer (whence);
|
||
|
|
lock.l_start = s48_extract_integer (start);
|
||
|
|
lock.l_len = s48_extract_integer (len);
|
||
|
|
retval = fcntl(s48_extract_fixnum (fd), s48_extract_integer (cmd), &lock);
|
||
|
|
if (retval == -1)
|
||
|
|
s48_raise_os_error_6 (errno, fd, cmd, type, whence, start, len);
|
||
|
|
return S48_UNSPECIFIC;
|
||
|
|
}
|
||
|
|
|
||
|
|
s48_value get_lock(s48_value fd, s48_value cmd, s48_value type,
|
||
|
|
s48_value whence, s48_value start, s48_value len)
|
||
|
|
{
|
||
|
|
struct flock lock;
|
||
|
|
int ret;
|
||
|
|
s48_value sch_type = S48_UNSPECIFIC;
|
||
|
|
s48_value sch_whence = S48_UNSPECIFIC;
|
||
|
|
s48_value sch_start = S48_UNSPECIFIC;
|
||
|
|
s48_value sch_len = S48_UNSPECIFIC;
|
||
|
|
s48_value sch_pid = S48_UNSPECIFIC;
|
||
|
|
s48_value sch_retval = S48_UNSPECIFIC;
|
||
|
|
|
||
|
|
S48_DECLARE_GC_PROTECT(6);
|
||
|
|
|
||
|
|
S48_GC_PROTECT_6(sch_type, sch_whence, sch_start, sch_len,
|
||
|
|
sch_pid, sch_retval);
|
||
|
|
|
||
|
|
lock.l_type = s48_extract_integer (type);
|
||
|
|
lock.l_whence = s48_extract_integer (whence);
|
||
|
|
lock.l_start = s48_extract_integer (start);
|
||
|
|
lock.l_len = s48_extract_integer (len);
|
||
|
|
ret = fcntl(s48_extract_fixnum (fd), F_GETLK, &lock);
|
||
|
|
if (ret == -1) {
|
||
|
|
S48_GC_UNPROTECT();
|
||
|
|
s48_raise_os_error_6 (errno, fd, cmd, type, whence, start, len);
|
||
|
|
} else {
|
||
|
|
|
||
|
|
sch_type = s48_enter_integer (lock.l_type);
|
||
|
|
sch_whence = s48_enter_integer (lock.l_whence);
|
||
|
|
sch_start = s48_enter_integer (lock.l_start);
|
||
|
|
sch_len = s48_enter_integer (lock.l_len);
|
||
|
|
sch_pid = s48_enter_integer (lock.l_pid);
|
||
|
|
|
||
|
|
sch_retval = s48_list_5(sch_type, sch_whence, sch_start, sch_len,
|
||
|
|
sch_pid);
|
||
|
|
S48_GC_UNPROTECT();
|
||
|
|
|
||
|
|
return sch_retval;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void s48_init_flock(void)
|
||
|
|
{
|
||
|
|
S48_EXPORT_FUNCTION(set_lock);
|
||
|
|
S48_EXPORT_FUNCTION(get_lock);
|
||
|
|
}
|