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vsock/test: add send_buf() utility function

Browse source 
Move the code of send_byte() out in a new utility function that
can be used to send a generic buffer.

This new function can be used when we need to send a custom
buffer and not just a single 'A' byte.

Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Reviewed-by: Arseniy Krasnov <avkrasnov@salutedevices.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stefano Garzarella 2023-09-15 14:14:50 +02:00 committed by David S. Miller
parent a0bcb83577
commit 12329bd51f
2 changed files with 56 additions and 36 deletions
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90
tools/testing/vsock/util.c
View file

@ -211,6 +211,59 @@ int vsock_seqpacket_accept(unsigned int cid, unsigned int port,
return vsock_accept(cid, port, clientaddrp, SOCK_SEQPACKET);
}
/* Transmit bytes from a buffer and check the return value.
*
* expected_ret:
* <0 Negative errno (for testing errors)
* 0 End-of-file
* >0 Success (bytes successfully written)
*/
void send_buf(int fd, const void *buf, size_t len, int flags,
ssize_t expected_ret)
{
ssize_t nwritten = 0;
ssize_t ret;
timeout_begin(TIMEOUT);
do {
ret = send(fd, buf + nwritten, len - nwritten, flags);
timeout_check("send");
if (ret == 0 || (ret < 0 && errno != EINTR))
break;
nwritten += ret;
} while (nwritten < len);
timeout_end();
if (expected_ret < 0) {
if (ret != -1) {
fprintf(stderr, "bogus send(2) return value %zd (expected %zd)\n",
ret, expected_ret);
exit(EXIT_FAILURE);
}
if (errno != -expected_ret) {
perror("send");
exit(EXIT_FAILURE);
}
return;
}
if (ret < 0) {
perror("send");
exit(EXIT_FAILURE);
}
if (nwritten != expected_ret) {
if (ret == 0)
fprintf(stderr, "unexpected EOF while sending bytes\n");
fprintf(stderr, "bogus send(2) bytes written %zd (expected %zd)\n",
nwritten, expected_ret);
exit(EXIT_FAILURE);
}
}
/* Receive bytes in a buffer and check the return value.
*
* expected_ret:
@ -273,43 +326,8 @@ void recv_buf(int fd, void *buf, size_t len, int flags, ssize_t expected_ret)
void send_byte(int fd, int expected_ret, int flags)
{
const uint8_t byte = 'A';
ssize_t nwritten;
timeout_begin(TIMEOUT);
do {
nwritten = send(fd, &byte, sizeof(byte), flags);
timeout_check("write");
} while (nwritten < 0 && errno == EINTR);
timeout_end();
if (expected_ret < 0) {
if (nwritten != -1) {
fprintf(stderr, "bogus send(2) return value %zd\n",
nwritten);
exit(EXIT_FAILURE);
}
if (errno != -expected_ret) {
perror("write");
exit(EXIT_FAILURE);
}
return;
}
if (nwritten < 0) {
perror("write");
exit(EXIT_FAILURE);
}
if (nwritten == 0) {
if (expected_ret == 0)
return;
fprintf(stderr, "unexpected EOF while sending byte\n");
exit(EXIT_FAILURE);
}
if (nwritten != sizeof(byte)) {
fprintf(stderr, "bogus send(2) return value %zd\n", nwritten);
exit(EXIT_FAILURE);
}
send_buf(fd, &byte, sizeof(byte), flags, expected_ret);
}
/* Receive one byte and check the return value.

2
tools/testing/vsock/util.h
View file

@ -42,6 +42,8 @@ int vsock_stream_accept(unsigned int cid, unsigned int port,
int vsock_seqpacket_accept(unsigned int cid, unsigned int port,
struct sockaddr_vm *clientaddrp);
void vsock_wait_remote_close(int fd);
void send_buf(int fd, const void *buf, size_t len, int flags,
ssize_t expected_ret);
void recv_buf(int fd, void *buf, size_t len, int flags, ssize_t expected_ret);
void send_byte(int fd, int expected_ret, int flags);
void recv_byte(int fd, int expected_ret, int flags);