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#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
#include <stdarg.h>
#include "_syscall.h"
int fcntl(int fildes, int cmd, ...)
{
SYSCALL_NUMBER(scno, fcntl, -1);
int r = -ENOSYS;
enum { NONE, INT, FLOCK } arg = NONE;
switch (cmd) {
case F_GETFD:
case F_GETFL:
break;
case F_DUPFD:
case F_SETFD:
case F_SETFL:
arg = INT;
break;
case F_GETLK:
case F_SETLK:
case F_SETLKW:
arg = FLOCK;
break;
default:
errno = EINVAL;
return -1;
}
if (arg == NONE) {
r = __syscall(scno, fildes);
} else {
va_list ap;
va_start(ap, cmd);
if (arg == INT) {
int n = va_arg(ap, int);
r = __syscall(scno, fildes, n);
} else if (arg == FLOCK) {
struct flock *fl = va_arg(ap, struct flock *);
r = __syscall(scno, fildes, fl);
}
va_end(ap);
}
if (r < 0) {
errno = -r;
return -1;
}
return r;
}
/*
POSIX(1)
*/
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