minix/lib/libc/sys-minix/fcntl.c

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#include <sys/cdefs.h>
#include "namespace.h"
#include <lib.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#ifdef __weak_alias
__weak_alias(fcntl, _fcntl)
#endif
static int __fcntl_321(int fd, int cmd, va_list argp);
int __fcntl_321(int fd, int cmd, va_list argp)
{
message m;
struct flock_321 f_321;
struct flock *flock;
int r;
/* Set up for the sensible case where there is no variable parameter. This
* covers F_GETFD, F_GETFL and invalid commands.
*/
m.m1_i3 = 0;
m.m1_p1 = NULL;
/* Adjust for the stupid cases. */
switch(cmd) {
case F_DUPFD:
case F_SETFD:
case F_SETFL:
m.m1_i3 = va_arg(argp, int);
break;
case F_GETLK:
case F_SETLK:
case F_SETLKW:
case F_FREESP:
/* VFS expects old format, so translate */
flock = (struct flock *) va_arg(argp, struct flock *);
f_321.l_type = flock->l_type;
f_321.l_whence = flock->l_whence;
f_321.l_start = flock->l_start;
f_321.l_len = flock->l_len;
f_321.l_pid = flock->l_pid;
m.m1_p1 = (char *) &f_321;
break;
}
/* Clean up and make the system call. */
m.m1_i1 = fd;
m.m1_i2 = cmd;
r = _syscall(VFS_PROC_NR, FCNTL_321, &m);
if (r == 0) {
/* Maybe we need to convert back */
switch(cmd) {
case F_GETLK:
case F_SETLK:
case F_SETLKW:
case F_FREESP:
/* VFS expected old format but libc new format, so translate */
flock->l_type = f_321.l_type;
flock->l_whence = f_321.l_whence;
flock->l_start = f_321.l_start;
flock->l_len = f_321.l_len;
flock->l_pid = f_321.l_pid;
break;
}
}
return r;
}
2012-03-25 20:25:53 +02:00
int fcntl(int fd, int cmd, ...)
{
va_list argp, argp_321;
message m;
int r, org_errno;
va_start(argp, cmd);
va_start(argp_321, cmd);
/* Set up for the sensible case where there is no variable parameter. This
* covers F_GETFD, F_GETFL and invalid commands.
*/
m.m1_i3 = 0;
m.m1_p1 = NULL;
/* Adjust for the stupid cases. */
switch(cmd) {
case F_DUPFD:
case F_SETFD:
case F_SETFL:
m.m1_i3 = va_arg(argp, int);
break;
case F_GETLK:
case F_SETLK:
case F_SETLKW:
case F_FREESP:
m.m1_p1 = (char *) va_arg(argp, struct flock *);
break;
}
/* Clean up and make the system call. */
va_end(argp);
m.m1_i1 = fd;
m.m1_i2 = cmd;
org_errno = errno;
r = _syscall(VFS_PROC_NR, FCNTL, &m);
if (r == -1 && errno == ENOSYS) {
errno = org_errno;
r = __fcntl_321(fd, cmd, argp_321);
}
va_end(argp_321);
return r;
}