* NFS and C Language @ 2005-12-09 11:12 RLN 2005-12-09 11:31 ` Vincent Roqueta 0 siblings, 1 reply; 4+ messages in thread From: RLN @ 2005-12-09 11:12 UTC (permalink / raw) To: nfs Hi! I want to write simple C language program to read and write a file in = NFS file system. Please give a link or advice to write a program using C language. Also help for which calls I have to use. Send instant messages to your online friends http://in.messenger.yahoo.com ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: NFS and C Language 2005-12-09 11:12 NFS and C Language RLN @ 2005-12-09 11:31 ` Vincent Roqueta 2005-12-09 14:10 ` Peter Staubach 0 siblings, 1 reply; 4+ messages in thread From: Vincent Roqueta @ 2005-12-09 11:31 UTC (permalink / raw) To: nfs; +Cc: RLN Le Vendredi 09 D=E9cembre 2005 12:12, RLN a =E9crit=A0: > Hi! > > > I want to write simple C language program to read and write a file in NFS > file system. > > Please give a link or advice to write a program using C language. > > Also help for which calls I have to use. You access NFS as other file systems... Generic C howto about files manipulations works for NFS. Vincent _______________________ #include <stdio.h> #include <string.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> int main(int argc, char **argv){ char path[]=3D"/path/to/the/testfile"; char string[]=3D"hello world!"; int fd; fd=3Dopen(path,O_WRONLY|O_CREAT); if(fd<0){ perror("Open"); return 0; } write(fd, string,strlen(string)); return 0; } ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: NFS and C Language 2005-12-09 11:31 ` Vincent Roqueta @ 2005-12-09 14:10 ` Peter Staubach 2005-12-09 14:24 ` Vincent Roqueta 0 siblings, 1 reply; 4+ messages in thread From: Peter Staubach @ 2005-12-09 14:10 UTC (permalink / raw) To: Vincent Roqueta; +Cc: nfs, RLN Vincent Roqueta wrote: >Le Vendredi 09 D=E9cembre 2005 12:12, RLN a =E9crit : > =20 > >>Hi! >> >> >>I want to write simple C language program to read and write a file in N= FS >>file system. >> >>Please give a link or advice to write a program using C language. >> >>Also help for which calls I have to use. >> =20 >> >You access NFS as other file systems... >Generic C howto about files manipulations works for NFS. > >Vincent > > >_______________________ >#include <stdio.h> >#include <string.h> >#include <sys/types.h> >#include <sys/stat.h> >#include <fcntl.h> > > >int main(int argc, char **argv){ > char path[]=3D"/path/to/the/testfile"; > char string[]=3D"hello world!"; > int fd; > > fd=3Dopen(path,O_WRONLY|O_CREAT); > if(fd<0){ > perror("Open"); > return 0; > } > write(fd, string,strlen(string)); > return 0; >} > Actually, this little program may or may not work on an NFS mounted file system. It contains a bug in that the open(2) system call takes three arguments and the third, the mode, is used when O_CREAT is specified and the file does not already exist. If the random bits, which the kernel uses because the mode was not actually specified, are wrong, like for example require mandatory locking, then the write(2) call may fail. Also, the write(2) call returns whether or not it succeeded and how much data was written. The close(2) call, which was not explicitly coded, but should have been, is also used to return whether any error occurred while trying to write data to the NFS server. Thanx... ps ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: NFS and C Language 2005-12-09 14:10 ` Peter Staubach @ 2005-12-09 14:24 ` Vincent Roqueta 0 siblings, 0 replies; 4+ messages in thread From: Vincent Roqueta @ 2005-12-09 14:24 UTC (permalink / raw) To: nfs Le Vendredi 09 D=E9cembre 2005 15:10, Peter Staubach a =E9crit=A0: > Vincent Roqueta wrote: > >Le Vendredi 09 D=E9cembre 2005 12:12, RLN a =E9crit : > >>Hi! > >> > >> > >>I want to write simple C language program to read and write a file in N= =46S > >>file system. > >> > >>Please give a link or advice to write a program using C language. > >> > >>Also help for which calls I have to use. > > > >You access NFS as other file systems... > >Generic C howto about files manipulations works for NFS. > > > >Vincent > > > > > >_______________________ > >#include <stdio.h> > >#include <string.h> > >#include <sys/types.h> > >#include <sys/stat.h> > >#include <fcntl.h> > > > > > >int main(int argc, char **argv){ > > char path[]=3D"/path/to/the/testfile"; > > char string[]=3D"hello world!"; > > int fd; > > > > fd=3Dopen(path,O_WRONLY|O_CREAT); > > if(fd<0){ > > perror("Open"); > > return 0; > > } > > write(fd, string,strlen(string)); > > return 0; > >} > > Actually, this little program may or may not work on an NFS mounted file > system. It contains a bug in that the open(2) system call takes three > arguments and the third, the mode, is used when O_CREAT is specified and > the file does not already exist. If the random bits, which the kernel > uses because the mode was not actually specified, are wrong, like for > example require mandatory locking, then the write(2) call may fail. > Also, the write(2) call returns whether or not it succeeded and how much > data was written. The close(2) call, which was not explicitly coded, > but should have been, is also used to return whether any error occurred > while trying to write data to the NFS server. Right... You can add I return 0 even if the program fails... I have taken a little less than 3 minutes to write this little example :) I hope C howto examples will be better :) Vincent ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2005-12-09 14:23 UTC | newest] Thread overview: 4+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2005-12-09 11:12 NFS and C Language RLN 2005-12-09 11:31 ` Vincent Roqueta 2005-12-09 14:10 ` Peter Staubach 2005-12-09 14:24 ` Vincent Roqueta
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