diff options
Diffstat (limited to 'src/libmdsclient/comm.c')
| -rw-r--r-- | src/libmdsclient/comm.c | 88 |
1 files changed, 79 insertions, 9 deletions
diff --git a/src/libmdsclient/comm.c b/src/libmdsclient/comm.c index 3284043..a01d1d7 100644 --- a/src/libmdsclient/comm.c +++ b/src/libmdsclient/comm.c @@ -19,6 +19,12 @@ #include <stdlib.h> #include <unistd.h> +#include <sys/types.h> +#include <sys/socket.h> + + + +#define min(a, b) ((a) < (b) ? (a) : (b)) @@ -119,19 +125,32 @@ void libmds_connection_free(libmds_connection_t* restrict this) * @param this The connection descriptor, must not be `NULL` * @param message The message to send, must not be `NULL` * @param length The length of the message, should be positive - * @return Zero on success, -1 on error, `ernno` - * will have been set accordingly on error + * @return The number of sent bytes. Less than `length` on error, + * `ernno` will have been set accordingly on error * - * @throws See pthread_mutex_lock(3) + * @throws EACCES See send(2) + * @throws EWOULDBLOCK See send(2), only if the socket has been modified to nonblocking + * @throws EBADF See send(2) + * @throws ECONNRESET If connection was lost + * @throws EDESTADDRREQ See send(2) + * @throws EFAULT See send(2) + * @throws EINVAL See send(2) + * @throws ENOBUFS See send(2) + * @throws ENOMEM See send(2) + * @throws ENOTCONN See send(2) + * @throws ENOTSOCK See send(2) + * @throws EPIPE See send(2) + * @throws See pthread_mutex_lock(3) */ -int libmds_connection_send(libmds_connection_t* restrict this, const char* message, size_t length) +size_t libmds_connection_send(libmds_connection_t* restrict this, const char* message, size_t length) { - int r, saved_errno; + int saved_errno; + size_t r; if (libmds_connection_lock(this)) - return -1; + return 0; - r = libmds_connection_send_unlocked(this, message, length); + r = libmds_connection_send_unlocked(this, message, length, 1); saved_errno = errno; (void) libmds_connection_unlock(this); @@ -139,8 +158,59 @@ int libmds_connection_send(libmds_connection_t* restrict this, const char* messa } -int libmds_connection_send_unlocked(libmds_connection_t* restrict this, const char* message, size_t length) +/** + * Send a message to the display server, without locking the + * mutex of the conncetion + * + * @param this The connection descriptor, must not be `NULL` + * @param message The message to send, must not be `NULL` + * @param length The length of the message, should be positive + * @param continue_on_interrupt Whether to continue sending if interrupted by a signal + * @return The number of sent bytes. Less than `length` on error, + * `ernno` will have been set accordingly on error + * + * @throws EACCES See send(2) + * @throws EWOULDBLOCK See send(2), only if the socket has been modified to nonblocking + * @throws EBADF See send(2) + * @throws ECONNRESET If connection was lost + * @throws EDESTADDRREQ See send(2) + * @throws EFAULT See send(2) + * @throws EINTR If interrupted by a signal, only if `continue_on_interrupt' is zero + * @throws EINVAL See send(2) + * @throws ENOBUFS See send(2) + * @throws ENOMEM See send(2) + * @throws ENOTCONN See send(2) + * @throws ENOTSOCK See send(2) + * @throws EPIPE See send(2) + */ +size_t libmds_connection_send_unlocked(libmds_connection_t* restrict this, const char* message, + size_t length, int continue_on_interrupt) { - return (void) this, (void) message, (void) length, 0; /* TODO */ + size_t block_size = length; + size_t sent = 0; + ssize_t just_sent; + + errno = 0; + while (length > 0) + if ((just_sent = send(this->socket_fd, message + sent, min(block_size, length), MSG_NOSIGNAL)) < 0) + { + if (errno == EMSGSIZE) + { + block_size >>= 1; + if (block_size == 0) + return sent; + } + else if ((errno == EINTR) && continue_on_interrupt) + continue; + else + return sent; + } + else + { + sent += (size_t)just_sent; + length -= (size_t)just_sent; + } + + return sent; } |