tonyg
/
fdpassing-keith-packard
mirror of https://github.com/keith-packard/fdpassing.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Split out sock_fd_read/sock_fd_write 

Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Keith Packard 2012-10-04 17:02:12 -07:00
parent 9b45269cc2
commit 8a0022bbb0
1 changed files with 50 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

76
fdpassing.c
View File

@ -22,23 +22,20 @@
#include <stdlib.h>
#include <stdio.h>
void
child(int sock)
int
sock_fd_read(int sock, void *buf, ssize_t bufsize, int *fd)
{
ssize_t size;
struct msghdr msg;
struct iovec iov;
char buf[16];
union {
struct cmsghdr cmsghdr;
char control[CMSG_SPACE(sizeof (int))];
} cmsgu;
struct cmsghdr *cmsg;
int fd;
iov.iov_base = buf;
iov.iov_len = sizeof(buf);
iov.iov_len = bufsize;
msg.msg_name = NULL;
msg.msg_namelen = 0;
@ -67,53 +64,80 @@ child(int sock)
exit(1);
}
fd = *((int *) CMSG_DATA(cmsg));
printf ("received fd %d\n", fd);
write(fd, "hello, world\n", 13);
*fd = *((int *) CMSG_DATA(cmsg));
printf ("received fd %d\n", *fd);
} else {
fd = -1;
*fd = -1;
}
exit(0);
return size;
}
void
parent(int sock)
child(int sock)
{
int fd;
char buf[16];
ssize_t size;
size = sock_fd_read(sock, buf, sizeof(buf), &fd);
if (size == 0)
return;
printf ("read %d\n", size);
if (fd != -1)
write(fd, "hello, world\n", 13);
}
ssize_t
sock_fd_write(int sock, void *buf, ssize_t buflen, int fd)
{
ssize_t size;
struct msghdr msg;
struct iovec iov;
char buf[16];
union {
struct cmsghdr cmsghdr;
char control[CMSG_SPACE(sizeof (int))];
} cmsgu;
struct cmsghdr *cmsg;
int fd;
iov.iov_base = "1";
iov.iov_len = 1;
iov.iov_base = buf;
iov.iov_len = buflen;
msg.msg_name = NULL;
msg.msg_namelen = 0;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = cmsgu.control;
msg.msg_controllen = sizeof(cmsgu.control);
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_len = CMSG_LEN(sizeof (int));
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
if (fd != -1) {
msg.msg_control = cmsgu.control;
msg.msg_controllen = sizeof(cmsgu.control);
fd = creat("test-file", 0666);
printf ("passing fd %d\n", fd);
*((int *) CMSG_DATA(cmsg)) = fd;
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_len = CMSG_LEN(sizeof (int));
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
printf ("passing fd %d\n", fd);
*((int *) CMSG_DATA(cmsg)) = fd;
} else {
msg.msg_control = NULL;
msg.msg_controllen = 0;
printf ("not passing fd\n");
}
size = sendmsg(sock, &msg, 0);
if (size < 0)
perror ("sendmsg");
return size;
}
void
parent(int sock)
{
ssize_t size;
size = sock_fd_write(sock, "1", 1, 1);
printf ("wrote %d\n", size);
}
int