Add error handling functions.

3 files changed, 258 insertions, 0 deletions

diff --git a/src/ourerr.cpp b/src/ourerr.cpp
new file mode 100644
index 0000000..0cdec07
--- /dev/null
+++ b/src/ourerr.cpp
@@ -0,0 +1,142 @@
+/*
+ * =====================================================================================
+ *
+ *       Filename:  ourerr.c
+ *
+ *    Description:  Error handling code from Stevens Advanced Programming in the
+ *    UNIX Environment. Appendix B page 682
+ *
+ *        Version:  1.0
+ *        Created:  06/02/2014 10:50:05 AM
+ *       Revision:  none
+ *       Compiler:  gcc
+ *
+ *         Author:  Martin Miller (), miller7@illinois.edu
+ *   Organization:  
+ *
+ * =====================================================================================
+ */
+
+#include <errno.h>
+#include <stdarg.h>
+#include "ourhdr.hpp"
+#include "ourerr.hpp"
+static void err_doit(int, const char *, va_list);
+char *pname = NULL;
+
+
+/* 
+ * ===  FUNCTION  ======================================================================
+ *         Name:  err_ret
+ *  Description:  Nonfatal error related to a system call. Print a message and
+ *  return.
+ * =====================================================================================
+ */
+    void
+err_ret ( const char *fmt, ... )
+{
+    va_list ap;
+    va_start(ap,fmt);
+    err_doit(1, fmt, ap);
+    va_end(ap);
+    return;
+}		/* -----  end of function err_ret  ----- */
+
+/* 
+ * ===  FUNCTION  ======================================================================
+ *         Name:  err_sys
+ *  Description:  Fatal error related to a system call. Print a message and
+ *  terminate.
+ * =====================================================================================
+ */
+    void
+err_sys ( const char *fmt, ... )
+{
+    va_list ap;
+
+    va_start(ap,fmt);
+    err_doit(1, fmt, ap);
+    va_end(ap);
+    exit(EXIT_FAILURE);
+}		/* -----  end of function err_sys  ----- */
+
+/* 
+ * ===  FUNCTION  ======================================================================
+ *         Name:  err_dump
+ *  Description:  Fatal error related to a system call. Print a message, dump
+ *  core, and terminate.
+ * =====================================================================================
+ */
+    void
+err_dump ( const char *fmt, ... )
+{
+    va_list ap;
+
+    va_start(ap,fmt);
+    err_doit(1, fmt, ap);
+    va_end(ap);
+    abort();
+    exit(EXIT_FAILURE);
+    return;
+}		/* -----  end of function err_dump  ----- */
+
+/* 
+ * ===  FUNCTION  ======================================================================
+ *         Name:  err_msg
+ *  Description:  Nonfatal error related to a system call. Print a message and
+ *  return.
+ * =====================================================================================
+ */
+    void
+err_msg ( const char *fmt, ... )
+{
+    va_list ap;
+
+    va_start(ap,fmt);
+    err_doit(0, fmt, ap);
+    va_end(ap);
+
+    return;
+}		/* -----  end of function err_msg  ----- */
+
+/* 
+ * ===  FUNCTION  ======================================================================
+ *         Name:  err_quit
+ *  Description:  
+ * =====================================================================================
+ */
+    void
+err_quit ( const char *fmt, ... )
+{
+    va_list ap;
+
+    va_start(ap,fmt);
+    err_doit(0, fmt, ap);
+    va_end(ap);
+
+    exit(EXIT_FAILURE);
+}		/* -----  end of function err_quit  ----- */
+/* 
+ * ===  FUNCTION  ======================================================================
+ *         Name:  err_doit
+ *  Description:  Print a message and return to caller. Caller specifies
+ *  "errnoflag"
+ * =====================================================================================
+ */
+    static void
+err_doit ( int errnoflag, const char *fmt, va_list ap )
+{
+    int errno_save;
+    char buf[ERRMAXLINE];
+    
+    errno_save = errno;
+    vsprintf( buf, fmt, ap );
+    if( errnoflag )
+        sprintf( buf+strlen(buf), ": %s", strerror(errno_save));
+    strcat(buf, "\n");
+    fflush(stdout);
+    fputs(buf, stderr);
+    fflush(NULL);
+
+    return;
+}		/* -----  end of function err_doit  ----- */
diff --git a/src/ourerr.hpp b/src/ourerr.hpp
new file mode 100644
index 0000000..d405e06
--- /dev/null
+++ b/src/ourerr.hpp
@@ -0,0 +1,8 @@
+#ifndef  ourerr_INC
+#define  ourerr_INC
+void err_ret ( const char *fmt, ... );
+void err_sys ( const char *fmt, ... );
+void err_dump ( const char *fmt, ... );
+void err_msg ( const char *fmt, ... );
+void err_quit ( const char *fmt, ... );
+#endif   /* ----- #ifndef ourerr_INC  ----- */
diff --git a/src/ourhdr.hpp b/src/ourhdr.hpp
new file mode 100644
index 0000000..eca50f2
--- /dev/null
+++ b/src/ourhdr.hpp
@@ -0,0 +1,108 @@
+/* Our own header, to be included *after* all standard system headers */
+
+#ifndef	__ourhdr_h
+#define	__ourhdr_h
+
+#include	<sys/types.h>	/* required for some of our prototypes */
+#include	<stdio.h>		/* for convenience */
+#include	<stdlib.h>		/* for convenience */
+#include	<string.h>		/* for convenience */
+#include	<unistd.h>		/* for convenience */
+
+#define	ERRMAXLINE	4096			/* max line length */
+
+#define	FILE_MODE	(S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)
+					/* default file access permissions for new files */
+#define	DIR_MODE	(FILE_MODE | S_IXUSR | S_IXGRP | S_IXOTH)
+					/* default permissions for new directories */
+
+typedef	void	Sigfunc(int);	/* for signal handlers */
+
+					/* 4.3BSD Reno <signal.h> doesn't define SIG_ERR */
+#if	defined(SIG_IGN) && !defined(SIG_ERR)
+#define	SIG_ERR	((Sigfunc *)-1)
+#endif
+
+#define	min(a,b)	((a) < (b) ? (a) : (b))
+#define	max(a,b)	((a) > (b) ? (a) : (b))
+
+					/* prototypes for our own functions */
+char	*path_alloc(int *);			/* {Prog pathalloc} */
+int		 open_max(void);			/* {Prog openmax} */
+void	 clr_fl(int, int);			/* {Prog setfl} */
+void	 set_fl(int, int);			/* {Prog setfl} */
+void	 pr_exit(int);				/* {Prog prexit} */
+void	 pr_mask(const char *);		/* {Prog prmask} */
+Sigfunc	*signal_intr(int, Sigfunc *);/* {Prog signal_intr_function} */
+
+int		 tty_cbreak(int);			/* {Prog raw} */
+int		 tty_raw(int);				/* {Prog raw} */
+int		 tty_reset(int);			/* {Prog raw} */
+void	 tty_atexit(void);			/* {Prog raw} */
+#ifdef	ECHO	/* only if <termios.h> has been included */
+struct termios	*tty_termios(void);	/* {Prog raw} */
+#endif
+
+void	 sleep_us(unsigned int);	/* {Ex sleepus} */
+ssize_t	 readn(int, void *, size_t);/* {Prog readn} */
+ssize_t	 writen(int, const void *, size_t);/* {Prog writen} */
+int		 daemon_init(void);			/* {Prog daemoninit} */
+
+int		 s_pipe(int *);				/* {Progs svr4_spipe bsd_spipe} */
+int		 recv_fd(int, ssize_t (*func)(int, const void *, size_t));
+									/* {Progs recvfd_svr4 recvfd_43bsd} */
+int		 send_fd(int, int);			/* {Progs sendfd_svr4 sendfd_43bsd} */
+int		 send_err(int, int, const char *);/* {Prog senderr} */
+int		 serv_listen(const char *);	/* {Progs servlisten_svr4 servlisten_44bsd} */
+int		 serv_accept(int, uid_t *);	/* {Progs servaccept_svr4 servaccept_44bsd} */
+int		 cli_conn(const char *);	/* {Progs cliconn_svr4 cliconn_44bsd} */
+int		 buf_args(char *, int (*func)(int, char **));
+									/* {Prog bufargs} */
+
+int		 ptym_open(char *);			/* {Progs ptyopen_svr4 ptyopen_44bsd} */
+int		 ptys_open(int, char *);	/* {Progs ptyopen_svr4 ptyopen_44bsd} */
+#ifdef	TIOCGWINSZ
+pid_t	 pty_fork(int *, char *, const struct termios *,
+				  const struct winsize *);	/* {Prog ptyfork} */
+#endif
+
+int		lock_reg(int, int, int, off_t, int, off_t);
+									/* {Prog lockreg} */
+#define	read_lock(fd, offset, whence, len) \
+			lock_reg(fd, F_SETLK, F_RDLCK, offset, whence, len)
+#define	readw_lock(fd, offset, whence, len) \
+			lock_reg(fd, F_SETLKW, F_RDLCK, offset, whence, len)
+#define	write_lock(fd, offset, whence, len) \
+			lock_reg(fd, F_SETLK, F_WRLCK, offset, whence, len)
+#define	writew_lock(fd, offset, whence, len) \
+			lock_reg(fd, F_SETLKW, F_WRLCK, offset, whence, len)
+#define	un_lock(fd, offset, whence, len) \
+			lock_reg(fd, F_SETLK, F_UNLCK, offset, whence, len)
+
+pid_t	lock_test(int, int, off_t, int, off_t);
+									/* {Prog locktest} */
+
+#define	is_readlock(fd, offset, whence, len) \
+			lock_test(fd, F_RDLCK, offset, whence, len)
+#define	is_writelock(fd, offset, whence, len) \
+			lock_test(fd, F_WRLCK, offset, whence, len)
+
+void	err_dump(const char *, ...);	/* {App misc_source} */
+void	err_msg(const char *, ...);
+void	err_quit(const char *, ...);
+void	err_ret(const char *, ...);
+void	err_sys(const char *, ...);
+
+void	log_msg(const char *, ...);		/* {App misc_source} */
+void	log_open(const char *, int, int);
+void	log_quit(const char *, ...);
+void	log_ret(const char *, ...);
+void	log_sys(const char *, ...);
+
+void	TELL_WAIT(void);		/* parent/child from {Sec race_conditions} */
+void	TELL_PARENT(pid_t);
+void	TELL_CHILD(pid_t);
+void	WAIT_PARENT(void);
+void	WAIT_CHILD(void);
+
+#endif	/* __ourhdr_h */