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fcntl: add O_CLOEXEC/FD_CLOEXEC support

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This commit is contained in:
chao.an
2020-02-03 22:21:54 +08:00
committed by Gregory Nutt
parent c015e42602
commit d07afc934e
6 changed files with 71 additions and 18 deletions
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net/socket/net_vfcntl.c
+32 -10
View File
@@ -110,21 +110,43 @@ int psock_vfcntl(FAR struct socket *psock, int cmd, va_list ap)
break;
case F_GETFD:
/* Get the file descriptor flags defined in <fcntl.h> that are associated
* with the file descriptor fd. File descriptor flags are associated
* with a single file descriptor and do not affect other file descriptors
* that refer to the same file.
/* Get the file descriptor flags defined in <fcntl.h> that are
* associated with the file descriptor fd. File descriptor flags
* are associated with a single file descriptor and do not affect
* other file descriptors that refer to the same file.
*/
{
ret = _SS_ISCLOEXEC(psock->s_flags) ? FD_CLOEXEC : 0;
}
break;
case F_SETFD:
/* Set the file descriptor flags defined in <fcntl.h>, that are associated
* with fd, to the third argument, arg, taken as type int. If the
* FD_CLOEXEC flag in the third argument is 0, the file shall remain open
* across the exec functions; otherwise, the file shall be closed upon
* successful execution of one of the exec functions.
/* Set the file descriptor flags defined in <fcntl.h>, that are
* associated with fd, to the third argument, arg, taken as type int.
* If the FD_CLOEXEC flag in the third argument is 0, the file shall
* remain open across the exec functions; otherwise, the file shall
* be closed upon successful execution of one of the exec functions.
*/
ret = -ENOSYS; /* F_GETFD and F_SETFD not implemented */
{
int oflags = va_arg(ap, int);
if (oflags & ~FD_CLOEXEC)
{
ret = -ENOSYS;
break;
}
if (oflags & FD_CLOEXEC)
{
psock->s_flags |= _SF_CLOEXEC;
}
else
{
psock->s_flags &= ~_SF_CLOEXEC;
}
}
break;
case F_GETFL:
net/socket/socket.h
+2
View File
@@ -57,6 +57,7 @@
/* Definitions of 8-bit socket flags */
#define _SF_CLOEXEC 0x04 /* Bit 2: Close on execute */
#define _SF_NONBLOCK 0x08 /* Bit 3: Don't block if no data (TCP/READ only) */
#define _SF_LISTENING 0x10 /* Bit 4: SOCK_STREAM is listening */
#define _SF_BOUND 0x20 /* Bit 5: SOCK_STREAM is bound to an address */
@@ -73,6 +74,7 @@
/* Macro to manage the socket state and flags */
#define _SS_ISCLOEXEC(s) (((s) & _SF_CLOEXEC) != 0)
#define _SS_ISNONBLOCK(s) (((s) & _SF_NONBLOCK) != 0)
#define _SS_ISLISTENING(s) (((s) & _SF_LISTENING) != 0)
#define _SS_ISBOUND(s) (((s) & _SF_BOUND) != 0)