From f844fafd324fbf4c7a986df2f0814f2e2d93bcd8 Mon Sep 17 00:00:00 2001
From: Miguel <m.i@gmx.at>
Date: Thu, 13 Sep 2018 14:32:28 +0200
Subject: thinking about syscalls and pipes

---
 .gitignore        |  3 +--
 README.md         |  2 ++
 kernel/syscalls.c | 10 ++++------
 kernel/syscalls.h |  9 +++++----
 test/pipetest.c   | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 xxx/README.md     |  1 +
 6 files changed, 67 insertions(+), 12 deletions(-)
 create mode 100644 test/pipetest.c
 create mode 100644 xxx/README.md

diff --git a/.gitignore b/.gitignore
index a96dac3..89365a6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,3 @@
-*.swp
 .lastvimsession
 .ycm_extra_conf.pyc
-xxx/
+.gdb_history
diff --git a/README.md b/README.md
index ee84a1e..ac12421 100644
--- a/README.md
+++ b/README.md
@@ -86,6 +86,8 @@ FoolOS is tested/developed on the following emulators/machines
 Todos
 -----
 
+* pipe\_syscall
+* Newlib errno / return value / argv / env
 * Cleanup Virtual Memory Manager / Flush TLB (?)
 * Mouse & KB processing in seperate task.
 * Kernel Stuff Reent?
diff --git a/kernel/syscalls.c b/kernel/syscalls.c
index 8246df8..6707ec3 100644
--- a/kernel/syscalls.c
+++ b/kernel/syscalls.c
@@ -128,12 +128,10 @@ int syscall_write(int file, char *buf, int len)
     return len;
 }
 
-int chk_syscall_read(int file, char *buf, int len)
-{
-    if(len> fifo_data_len[file])return 0;
-    return 1;
-}
-
+/** 
+ * __read()__ attemts to read up to _len_ bytes from file descriptor _file_ 
+ * into the buffer starting at _buf_. 
+ */
 int syscall_read(int file, char *buf, int len)
 {
     //file 0 = stdin ,  file 1 = stdout , file 2 = stderr
diff --git a/kernel/syscalls.h b/kernel/syscalls.h
index 8b88e6a..b31d32c 100644
--- a/kernel/syscalls.h
+++ b/kernel/syscalls.h
@@ -6,11 +6,11 @@
 #define SYSCALL_OPEN         65
 
 #define SYSCALL_GETPID       78
-#define SYSCALL_ISATTY       68
+#define SYSCALL_ISATTY       68 // linux??
 #define SYSCALL_LINK         82
 #define SYSCALL_LSEEK        69
 #define SYSCALL_READ         62
-#define SYSCALL_SBRK         70
+#define SYSCALL_SBRK         70 // linux??
 #define SYSCALL_STAT         74
 #define SYSCALL_FSTAT        67
 #define SYSCALL_LSTAT        79
@@ -19,14 +19,15 @@
 #define SYSCALL_WAIT         77
 #define SYSCALL_WRITE        61
 #define SYSCALL_GETTIMEOFDAY 71
-#define SYSCALL_READDIR      63
+#define SYSCALL_READDIR      63 // getdents?
 #define SYSCALL_KILL         73
 #define SYSCALL_POLL         80 //shit!?
 #define SYSCALL_CLONE        83
+#define SYSCALL_PIPE         84 // TODO! unnamed and named pipes (fifos) SYSCALL_MKNOD
 
 char* syscall_get_name(uint32_t num);
 uint32_t syscall_generic(uint32_t nr,uint32_t p1, uint32_t p2, uint32_t p3, uint32_t pid);
-int chk_syscall_read(int file, char *buf, int len);
+
 int syscall_open(char *name, int flags, int mode);
 int syscall_write(int file, char *buf, int len);
 
diff --git a/test/pipetest.c b/test/pipetest.c
new file mode 100644
index 0000000..e848049
--- /dev/null
+++ b/test/pipetest.c
@@ -0,0 +1,54 @@
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+
+int main(int argc, char *argv[])
+{
+    printf("LINUX PIPE TEST\n");
+
+    if(argc<=1)
+    {
+	printf("one argument please [read|write]\n");
+    }
+
+    if(!strcmp(argv[1],"read"))
+    {
+	FILE *p=fopen("./testpipe","r");
+	printf("opened for reading\n");
+	printf("feof: %i\n",feof(p));
+
+	if(p==NULL)
+	{
+	    int err=errno;
+	    printf("Opening pipe failed with errno %d : %s\n",err,strerror(err));
+	}
+
+	while(1)
+	{
+	char buf[256];
+	int ret=fread(buf,1,10,p);
+	buf[10]=0;
+        printf("read: %i %s\n",ret,buf);
+	printf("feof: %i\n",feof(p));
+	if (feof(p)) break;
+	}
+    }
+    
+    if(!strcmp(argv[1],"write"))
+    {
+	FILE *p=fopen("./testpipe","a");
+	printf("opened for writing\n");
+	if(p==NULL)
+	{
+	    int err=errno;
+	    printf("Opening pipe failed with errno %d : %s\n",err,strerror(err));
+	}
+	fwrite("DUPA123",1,7,p);
+	fwrite("DUPA123",1,7,p);
+	for(int i=0;i<10000;i++)
+	{
+	fwrite("DUPA123",1,7,p);
+	}
+	//fclose(p);
+    }
+}
diff --git a/xxx/README.md b/xxx/README.md
new file mode 100644
index 0000000..16aeeac
--- /dev/null
+++ b/xxx/README.md
@@ -0,0 +1 @@
+some old files
-- 
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