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Implement message send and receive functions.

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This commit is contained in:
Enrico Fraccaroli (Galfurian)
2023-06-08 16:38:42 -04:00
parent 8f6ff5a59a
commit f515c44eb3
6 changed files with 234 additions and 31 deletions
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libc/inc/sys/msg.h
+18 -10
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@@ -16,6 +16,12 @@
/// The default maximum size in bytes of a message queue.
#define MSGMNB 16384
/// Specify that we should not treat as an error if the message we are trying to
/// return to the user, is too big. That message will be truncated to fit the
/// user-defined reading buffer. If not specified, the message is kept in the
/// queue, and an error is returned.
#define MSG_NOERROR 010000
/// @brief Buffer to use with the message queue IPC.
struct msgbuf {
/// Type of the message.
@@ -70,7 +76,7 @@ int msq_init();
/// @param msgflg controls the behaviour of the function.
/// @return the message queue identifier, -1 on failure, and errno is set to
/// indicate the error.
long sys_msgget(key_t key, int msgflg);
int sys_msgget(key_t key, int msgflg);
/// @brief Used to send messages.
/// @param msqid the message queue identifier.
@@ -78,7 +84,7 @@ long sys_msgget(key_t key, int msgflg);
/// @param msgsz specifies the size in bytes of mtext.
/// @param msgflg specifies the action to be taken in case of specific events.
/// @return 0 on success, -1 on failure and errno is set to indicate the error.
int sys_msgsnd(int msqid, struct msgbuf *msgp, size_t msgsz, int msgflg);
int sys_msgsnd(int msqid, const void *msgp, size_t msgsz, int msgflg);
/// @brief Used to receive messages.
/// @param msqid the message queue identifier.
@@ -90,15 +96,16 @@ int sys_msgsnd(int msqid, struct msgbuf *msgp, size_t msgsz, int msgflg);
/// - msgtyp < 0: the first message of the lowest type that is less than or
/// equal to the absolute value of msgtyp is received.
/// @param msgflg specifies the action to be taken in case of specific events.
/// @return 0 on success, -1 on failure and errno is set to indicate the error.
ssize_t sys_msgrcv(int msqid, struct msgbuf *msgp, size_t msgsz, long msgtyp, int msgflg);
/// @return the number of bytes actually copied on success, -1 on failure and
/// errno is set to indicate the error.
ssize_t sys_msgrcv(int msqid, void *msgp, size_t msgsz, long msgtyp, int msgflg);
/// @brief Message queue control operations.
/// @param msqid the message queue identifier.
/// @param cmd The command to perform.
/// @param buf used with IPC_STAT and IPC_SET.
/// @return 0 on success, -1 on failure and errno is set to indicate the error.
long sys_msgctl(int msqid, int cmd, struct msqid_ds *buf);
int sys_msgctl(int msqid, int cmd, struct msqid_ds *buf);
#else
@@ -108,7 +115,7 @@ long sys_msgctl(int msqid, int cmd, struct msqid_ds *buf);
/// @param msgflg controls the behaviour of the function.
/// @return the message queue identifier, -1 on failure, and errno is set to
/// indicate the error.
long msgget(key_t key, int msgflg);
int msgget(key_t key, int msgflg);
/// @brief Used to send messages.
/// @param msqid the message queue identifier.
@@ -116,7 +123,7 @@ long msgget(key_t key, int msgflg);
/// @param msgsz specifies the size in bytes of mtext.
/// @param msgflg specifies the action to be taken in case of specific events.
/// @return 0 on success, -1 on failure and errno is set to indicate the error.
long msgsnd(int msqid, struct msgbuf *msgp, size_t msgsz, int msgflg);
int msgsnd(int msqid, const void *msgp, size_t msgsz, int msgflg);
/// @brief Used to receive messages.
/// @param msqid the message queue identifier.
@@ -128,14 +135,15 @@ long msgsnd(int msqid, struct msgbuf *msgp, size_t msgsz, int msgflg);
/// - msgtyp < 0: the first message of the lowest type that is less than or
/// equal to the absolute value of msgtyp is received.
/// @param msgflg specifies the action to be taken in case of specific events.
/// @return 0 on success, -1 on failure and errno is set to indicate the error.
long msgrcv(int msqid, struct msgbuf *msgp, size_t msgsz, long msgtyp, int msgflg);
/// @return the number of bytes actually copied on success, -1 on failure and
/// errno is set to indicate the error.
ssize_t msgrcv(int msqid, void *msgp, size_t msgsz, long msgtyp, int msgflg);
/// @brief Message queue control operations.
/// @param msqid the message queue identifier.
/// @param cmd The command to perform.
/// @param buf used with IPC_STAT and IPC_SET.
/// @return 0 on success, -1 on failure and errno is set to indicate the error.
long msgctl(int msqid, int cmd, struct msqid_ds *buf);
int msgctl(int msqid, int cmd, struct msqid_ds *buf);
#endif