thinking about syscalls and pipes

2 files changed, 9 insertions, 10 deletions

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);