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First rough implementation of shared memory.

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This commit is contained in:
Enrico Fraccaroli (Galfurian)
2023-08-16 11:49:52 -04:00
parent 07d603f47a
commit dde6e6bc9e
7 changed files with 225 additions and 59 deletions
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libc/inc/sys/shm.h
+9 -51
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@@ -51,20 +51,6 @@ struct shmid_ds {
#define SHM_W 0200
//==============================================================================
//======== Flags for shmat =====================================================
// Attach read-only else read-write.
#define SHM_RDONLY 010000
// Round attach address to SHMLBA.
#define SHM_RND 020000
// Take-over region on attach.
#define SHM_REMAP 040000
// Execution access.
#define SHM_EXEC 0100000
//==============================================================================
//======== Commands for shmctl =================================================
// Lock segment (root only).
#define SHM_LOCK 11
@@ -93,41 +79,13 @@ struct shmid_ds {
// Don't check for reservations.
#define SHM_NORESERVE 010000
/// @@brief Syscall Service Routine: Shared memory control operation.
int syscall_shmctl(int *args);
/// @@brief Syscall Service Routine: Get shared memory segment.
int syscall_shmget(int *args);
/// @@brief Syscall Service Routine: Attach shared memory segment.
void *syscall_shmat(int *args);
/// @@brief Syscall Service Routine: Detach shared memory segment.
int syscall_shmdt(int *args);
/// @@brief User Wrapper: Shared memory control operation.
int shmctl(int shmid, int cmd, struct shmid_ds *buf);
/// @@brief User Wrapper: Get shared memory segment.
int shmget(key_t key, size_t size, int flags);
/// @@brief User Wrapper: Attach shared memory segment.
void *shmat(int shmid, void *shmaddr, int flag);
/// @@brief User Wrapper: Detach shared memory segment.
int shmdt(void *shmaddr);
/// @@brief Find shmid_ds on list.
struct shmid_ds *find_shm_fromid(int shmid);
/// @@brief Find shmid_ds on list.
struct shmid_ds *find_shm_fromkey(key_t key);
/// @@brief shmid_ds on list.
struct shmid_ds *find_shm_fromvaddr(void *shmvaddr);
#endif
#define SHM_RDONLY 010000 ///< Attach read-only else read-write.
#define SHM_RND 020000 ///< Round attach address to SHMLBA.
#define SHM_REMAP 040000 ///< Take-over region on attach.
#define SHM_EXEC 0100000 ///< Execution access.
#ifdef __KERNEL__
/// @brief Initializes the shared memory.
@@ -138,10 +96,10 @@ int shm_init();
/// @param key can be used either to obtain the identifier of a previously
/// created shared memory, or to create a new one.
/// @param size of the shared memory, rounded up to a multiple of PAGE_SIZE.
/// @param flag controls the behaviour of the function.
/// @param shmflg controls the behaviour of the function.
/// @return the shared memory identifier, -1 on failure, and errno is set to
/// indicate the error.
long sys_shmget(key_t key, size_t size, int flag);
long sys_shmget(key_t key, size_t size, int shmflg);
/// @brief Attaches the shared memory segment identified by shmid to the address
/// space of the calling process.
@@ -173,10 +131,10 @@ long sys_shmctl(int shmid, int cmd, struct shmid_ds *buf);
/// @param key can be used either to obtain the identifier of a previously
/// created shared memory, or to create a new one.
/// @param size of the shared memory, rounded up to a multiple of PAGE_SIZE.
/// @param flag controls the behaviour of the function.
/// @param shmflg controls the behaviour of the function.
/// @return the shared memory identifier, -1 on failure, and errno is set to
/// indicate the error.
long shmget(key_t key, size_t size, int flag);
long shmget(key_t key, size_t size, int shmflg);
/// @brief Attaches the shared memory segment identified by shmid to the address
/// space of the calling process.