i/o redirection in sh

better parsing of sh commands (copied from jos sh)
cat: read from 1 if no args
sbrk system call, but untested
getpid system call
moved locks in keyboard intr, but why do we get intr w. null characters from keyboard?

1 files changed, 3 insertions, 0 deletions

diff --git a/user.h b/user.h
index 26d984c..cc82ccf 100644
--- a/user.h
+++ b/user.h
@@ -18,10 +18,13 @@ int link(char *, char *);
 int mkdir(char *);
 int chdir(char *);
 int dup(int);
+int getpid();
 
 int stat(char *, struct stat *stat);
 int puts(char*);
 char* strcpy(char*, char*);
+char *strchr(const char *s, char c);
+int strcmp(const char *p, const char *q);
 void printf(int fd, char *fmt, ...);
 char *gets(char *, int max);
 unsigned int strlen(char *);