1 #define _GNU_SOURCE
2 #include <unistd.h>
3 #include <errno.h>
4 #include <fcntl.h>
5 #include "syscall.h"
6
__dup3(int old,int new,int flags)7 int __dup3(int old, int new, int flags)
8 {
9 int r;
10 #ifdef SYS_dup2
11 if (old==new) return __syscall_ret(-EINVAL);
12 if (flags) {
13 while ((r=__syscall(SYS_dup3, old, new, flags))==-EBUSY);
14 if (r!=-ENOSYS) return __syscall_ret(r);
15 if (flags & ~O_CLOEXEC) return __syscall_ret(-EINVAL);
16 }
17 while ((r=__syscall(SYS_dup2, old, new))==-EBUSY);
18 if (r >= 0 && (flags & O_CLOEXEC))
19 __syscall(SYS_fcntl, new, F_SETFD, FD_CLOEXEC);
20 #else
21 while ((r=__syscall(SYS_dup3, old, new, flags))==-EBUSY);
22 #endif
23 return __syscall_ret(r);
24 }
25
26 weak_alias(__dup3, dup3);
27