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#define _GNU_SOURCE
#include <fcntl.h>
#include <unistd.h>
#include <stdarg.h>
#include <errno.h>
#include "syscall.h"
#include "libc.h"
int fcntl(int fd, int cmd, ...)
{
long arg;
va_list ap;
va_start(ap, cmd);
arg = va_arg(ap, long);
va_end(ap);
if (cmd == F_SETFL) arg |= O_LARGEFILE;
if (cmd == F_SETLKW) return syscall_cp(SYS_fcntl, fd, cmd, arg);
if (cmd == F_GETOWN) {
struct f_owner_ex ex;
int ret = __syscall(SYS_fcntl, fd, F_GETOWN_EX, &ex);
if (ret == -EINVAL) return __syscall(SYS_fcntl, fd, cmd, arg);
if (ret) return __syscall_ret(ret);
return ex.type == F_OWNER_PGRP ? -ex.pid : ex.pid;
}
if (cmd == F_DUPFD_CLOEXEC) {
int ret = __syscall(SYS_fcntl, fd, F_DUPFD_CLOEXEC, arg);
if (ret != -EINVAL) {
if (ret >= 0)
__syscall(SYS_fcntl, ret, F_SETFD, FD_CLOEXEC);
return __syscall_ret(ret);
}
ret = __syscall(SYS_fcntl, fd, F_DUPFD_CLOEXEC, 0);
if (ret != -EINVAL) {
if (ret >= 0) __syscall(SYS_close, ret);
return __syscall_ret(-EINVAL);
}
ret = __syscall(SYS_fcntl, fd, F_DUPFD, arg);
if (ret >= 0) __syscall(SYS_fcntl, ret, F_SETFD, FD_CLOEXEC);
return __syscall_ret(ret);
}
return syscall(SYS_fcntl, fd, cmd, arg);
}
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