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Overview of Files and Subroutines

Here follows a list of the program files and their contents. The list is given here only to provide a minimal overview of the code written. Excerpts from the server program, pserver.c, and the include file for client applications, pclient.h, are given in Appendix A. An overview of which files are included in which files can be seen in Figure 6.5.

pclient.h: Include file for client applications.^6.2

• #include: "pesto.h" & "ppclient.h"

- contains all of those primitives described in Section 5.7.1 and Section 5.7.2 except p_perror.

Figure 6.5: Include files

ptacod.c: Communication between $\mathcal{P}$$e$$\mathcal{S}$$t$$\mathcal{O}$ and TACO. It is in this file that the intervals for connected, weakly connected, and disconnected operation are defined (see Figure 6.1, p. ).

• #include: "pesto.h" & "mobsup.h"
• #define: FULL_COST_MAX, FULL_BANDWIDTH_MIN, FULL_LATENCY_MAX,
  WEAK_COST_MAX, WEAK_BANDWIDTH_MIN & WEAK_LATENCY_MAX.

Should be linked with the TACO mob library:

 cc -o ptacod -I/home/projects/tacoo/tacosys/moblib/include  \
 -L/home/projects/tacoo/tacosys/moblib/lib -D LINUX ptacod.c \
 -lmob

Is supposed to run on client machine in the background, and the TACO link daemon, linkd, should also be running.

--

pserver.c: $\mathcal{P}$$e$$\mathcal{S}$$t$$\mathcal{O}$ server program.

• #include: "pesto.h" & "ppserver.h"
• void main(int argc,char *argv[])
• void p_server()

Is supposed to be running on the server machine!

--

pesto.h: Shared include file for clients and server.

• p_perror (see 5.7.2)
• int init_host(char *host,int port,struct sockaddr_in *sa)
• int init_sock(struct sockaddr_in *sa,int *sd)
• int send_file(int sd,char *name)
• int recv_file(int sd,char *name,mode_t perms)
• int close_sock(int sd)
• int lock_file(int fd)
• int unlock_file(int fd)

Also contains all necessary includes of standard libraries, all commonly used defines, a type definition of the buffer used for exchanging messages between server and client, and global variables (such as the $\mathcal{P}$$e$$\mathcal{S}$$t$$\mathcal{O}$ error number variable int pso_errno).

--

ppclient.h: Include file for client code. Contains miscellaneous help functions used by the various library functions in pclient.h.

• #include: "pinfo.h", "ptaco.h" & "pname.h"
• typedef: NAME & _nameb
• void pbuf(pmessage *buf,int request,long ret,long wet,long
  ct,long cct,long mt,char *name)
• FILE *pfopen(char *name,char *mode,int fd)
• int prequest(struct sockaddr_in *sa,int *sd,pmessage *buf)
• int preceive(struct sockaddr_in *sa,int *sd,pmessage *buf)

--

pinfo.h: Include file for client code. Contains functions that read, write, and update caching information for files.

• void name_info(char *name,char *infoname)
• int write_info(int fd,long mt,long ct,long cct,long ret,long wet,long crt)
• int read_info(char *name,long *mt,long *ct,long *cct,long
  *ret,long *wet,long *crt,int *fd)
• int update_info(int fd,long mt,long ct,long cct,long ret,long wet,long crt)
• int delete_info(char *name)

--

ptaco.h: Include file for client code. Contains the function int ptaco() used for determining communication status as reported by ptacod.c.

--

pname.h: Include file for client code. Contains functions for mapping file pointer to file names and lock expiration times. Uses the NAME & _nameb structures defined in ppclient.h in a similar manner to the handling of open file pointers in [21, Ch.8].

• int pgetname(FILE *fp,char *name)
• int pinsname(FILE *fp,char *name)
• int pdelname(FILE *fp)

--

ppserver.h: Include file for server code. Contains miscellaneous help functions used in the server program.

• #include: "plock.h"
• #define: LOG & LOGFILE
• void plog(char *str)
• void plogerr(char *str,int sd,char *name)

--

plock.h: Include file for server code. Contains functions that read, write, and update locking information for files.

• name_lock(char *name,char *lockname)
• int write_lock(int fd,char *host,long ret,long wet)
• int read_lock(char *name,char *host,long *ret,long *wet,int *fd)
• int update_lock(int fd,char *host,int ret,int wet)
• int lookup_lock(int fd,char *host,long ret,long wet)
• int delete_lock(char *name)

Footnotes

... applications.^6.2

Will some day be implemented as a library.

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