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This commit is contained in:
Enrico Fraccaroli
2023-04-12 15:01:32 +02:00
parent 79489757e3
commit 32b8bd898c
1 changed files with 28 additions and 47 deletions
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libc/src/ipc/ipc.c
+28 -47
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@@ -7,14 +7,12 @@
#include "system/syscall_types.h"
#include "sys/errno.h"
#include "stddef.h"
#include "ipc/sem.h"
#include "ipc/shm.h"
#include "ipc/msg.h"
//#include "fs/vfs_types.h"
//#include "fs/vfs.h"
#include "fcntl.h"
#include "sys/stat.h"
#include "stdio.h"
_syscall3(void *, shmat, int, shmid, const void *, shmaddr, int, shmflg)
@@ -26,11 +24,7 @@ _syscall3(long, shmctl, int, shmid, int, cmd, struct shmid_ds *, buf)
_syscall3(long, semget, key_t, key, int, nsems, int, semflg)
//we are writing our own user-side semop function
//_syscall3(long, semop, int, semid, struct sembuf *, sops, unsigned, nsops)
_syscall4(long, semctl, int, semid, int, semnum, int, cmd, union semun*, arg)
_syscall4(long, semctl, int, semid, int, semnum, int, cmd, union semun *, arg)
_syscall2(long, msgget, key_t, key, int, msgflg)
@@ -40,53 +34,40 @@ _syscall5(long, msgrcv, int, msqid, struct msgbuf *, msgp, size_t, msgsz, long,
_syscall3(long, msgctl, int, msqid, int, cmd, struct msqid_ds *, buf)
/*user-side semop*/
long semop(int semid, struct sembuf *sops, unsigned nsops){
long semop(int semid, struct sembuf *sops, unsigned nsops)
{
long __res;
if (nsops<=0 || sops == NULL){ //checking parameters
// Check the arguments.
if ((nsops <= 0) || (sops == NULL)) {
errno = EINVAL;
return -1;
}
/*the process continues to try to perform the operation until it completes or receives an error*/
while (1){
//calling kernel-side function
__inline_syscall3(__res,semop, semid, sops, nsops);
if (__res != OPERATION_NOT_ALLOWED)break;
// The process continues to try to perform the operation until it completes
// or receives an error.
while (1) {
// Calling the kernel-side function.
__inline_syscall3(__res, semop, semid, sops, nsops);
// If we get an error we stop the loop.
if (__res != OPERATION_NOT_ALLOWED)
break;
}
__syscall_return(long, __res); //returning the value
// Now, we can return the value.
__syscall_return(long, __res);
}
key_t ftok(char *path, int id){
/*int fd;
fd=open(path, O_RDONLY, 0777);*/
/*
if (() == -1){
errno = ENOENT;
return -1;
}
*/
struct stat_t st; //struct containing the serial number and the device number of the file
if (stat(path, &st)<0){
key_t ftok(char *path, int id)
{
// Create a struct containing the serial number and the device number of the
// file we use to generate the key.
struct stat_t st;
if (stat(path, &st) < 0) {
errno = ENOENT;
//printf("Error finding the serial number, check Errno...\n");
return -1;
return -1;
}
//printf("Serial number: %d\n", st.st_ino);
//taking the upper 8 bits from the lower 8 bits of id, the second upper 8 bits from the lower 8 bits of the device number of the provided pathname, and the lower 16 bits from the lower 16 bits of the inode number of the provided pathname
// Taking the upper 8 bits from the lower 8 bits of id, the second upper 8
// bits from the lower 8 bits of the device number of the provided pathname,
// and the lower 16 bits from the lower 16 bits of the inode number of the
// provided pathname.
return ((st.st_ino & 0xffff) | ((st.st_dev & 0xff) << 16) | ((id & 0xffu) << 24));
}