ls lists the contents of directories and displays file properties. It works by:
1. Using the dirent struct to read directory entries and the stat struct to obtain file attributes from the filesystem.
2. It determines file types like regular file, directory, symlink etc. using macros on the st_mode field from stat.
3. It converts the st_mode field to a string representation of the file permissions and types.
ABOUT CORE JAVA COURSE SCOPE:
JAVA based business programs perform well because constant JAVA requirements help designers to create multilevel programs with a component centered approach.
JAVA growth allows secure and top rated application growth on several systems. Many companies in India have well-qualified application technicians having skills in Java, J2EE, JSP, and J2ME, JAVA Programming Solutions help your businesses to do better. Many companies recruit fresh candidates as trainees in CORE JAVA and later on student’s knowledge will be enhanced.
PROGRAM EDGES:
Our training segments are completely designed according to current IT market.
Student will go through the coaching of OOPs concept and DBMS, RDBMS ideas as free of charge package before starting of Java Training.
We offer regular, speed up and end of the week coaching in Java training.
Our major concern is to offer java technology coaching to you so that you can be wiser and create effective programs and programs more quickly using any system – such as Oracle’s program server and web facilities software.
After finishing java training, students can easily create and set up your own real-time java program.
Study material is provided with the course which includes ideas, illustrations and real-time illustrations.
ABOUT CORE JAVA COURSE SCOPE:
JAVA based business programs perform well because constant JAVA requirements help designers to create multilevel programs with a component centered approach.
JAVA growth allows secure and top rated application growth on several systems. Many companies in India have well-qualified application technicians having skills in Java, J2EE, JSP, and J2ME, JAVA Programming Solutions help your businesses to do better. Many companies recruit fresh candidates as trainees in CORE JAVA and later on student’s knowledge will be enhanced.
PROGRAM EDGES:
Our training segments are completely designed according to current IT market.
Student will go through the coaching of OOPs concept and DBMS, RDBMS ideas as free of charge package before starting of Java Training.
We offer regular, speed up and end of the week coaching in Java training.
Our major concern is to offer java technology coaching to you so that you can be wiser and create effective programs and programs more quickly using any system – such as Oracle’s program server and web facilities software.
After finishing java training, students can easily create and set up your own real-time java program.
Study material is provided with the course which includes ideas, illustrations and real-time illustrations.
Does Your IBM i Security Meet the Bar for GDPR?Precisely
While the European Union’s General Data Protection Regulation (GDPR) took effect May 25, many global organizations still feel the stress of achieving compliance. Could your organization pass an audit and avoid fines today?
If you are concerned about GDPR compliance, or compliance with other security regulations, view this webinar with IBM Systems Magazine where we provide a practical guide to setting up a more secure, auditable IBM i configuration. You will learn about base IBM i functions, Do-It-Yourself tips, and how software solutions can help you accelerate and maintain compliance.
This webcast and all related materials are provided for informational purposes only, and are not intended to provide, and should not be relied on for, legal advice pertaining to the subject matter. If you have specific questions on how this may affect your organization you should consult your legal advisor.
Writing Character driver (loadable module) in linuxRajKumar Rampelli
It covers the step by step approach on how to write a simple loadable character device driver in linux. What are Device files in linux detail. How user application interact with character driver using a device file.
LAS16-300: Mini Conference 2 Cortex-M Software - Device ConfigurationLinaro
LAS16-300: Mini Conference 2 RTOS-Zephyr - Device Configuration
Speakers: Andy Gross
Date: September 28, 2016
★ Session Description ★
SoC Vendors, board vendors, software middle layers, scripting languages, etc all need to have access to system configuration information (pin muxes, what sensors are on a system, what amount of memory, flash, etc, etc). We need a means to convey this in a vendor neutral mechanism but also one that is friendly for Cortex-M/constrained footprint devices. This session will be to discuss the topic, how its done today, what kinda tooling might exist from different vendors, what we could utilize (device tree) and what issues that creates.
★ Resources ★
Etherpad: pad.linaro.org/p/las16-300
Presentations & Videos: http://connect.linaro.org/resource/las16/las16-300/
★ Event Details ★
Linaro Connect Las Vegas 2016 – #LAS16
September 26-30, 2016
http://www.linaro.org
http://connect.linaro.org
Schema on read is obsolete. Welcome metaprogramming..pdfLars Albertsson
How fast can you modify your data collection to include a new field, make all the necessary changes in data processing and storage, and then use that field in analytics or product features? For many companies, the answer is a few quarters, whereas others do it in a day. This data agility latency has a direct impact on companies' ability to innovate with data. Schema-on-read has been a key strategy to lower that latency - as the community has shifted towards storing data outside relational databases, we no longer need to make series of schema changes through the whole data chain, coordinated between teams to minimise operational risk. Schema-on-read comes with a cost, however. Errors that we used to catch during testing or in early test deployments can now sneak into production undetected and surface as product errors or hard-to-debug data quality problems later than with schema-on-write solutions.
In this presentation, we will show how we have rejected the tradeoff between slow schema change rate and quality to achieve the best of both worlds. By using metaprogramming and versioned pipelines that are tested end-to-end, we can achieve fast schema changes with schema-on-write and the protection of static typing. We will describe the tools in our toolbox - Scalameta, Chimney, Bazel, and custom tools. We will also show how we leverage them to take static typing one step further and differentiate between domain types that share representation, e.g. EmailAddress vs ValidatedEmailAddress or kW vs kWh, while maintaining harmony with data technology ecosystems.
Does Your IBM i Security Meet the Bar for GDPR?Precisely
While the European Union’s General Data Protection Regulation (GDPR) took effect May 25, many global organizations still feel the stress of achieving compliance. Could your organization pass an audit and avoid fines today?
If you are concerned about GDPR compliance, or compliance with other security regulations, view this webinar with IBM Systems Magazine where we provide a practical guide to setting up a more secure, auditable IBM i configuration. You will learn about base IBM i functions, Do-It-Yourself tips, and how software solutions can help you accelerate and maintain compliance.
This webcast and all related materials are provided for informational purposes only, and are not intended to provide, and should not be relied on for, legal advice pertaining to the subject matter. If you have specific questions on how this may affect your organization you should consult your legal advisor.
Writing Character driver (loadable module) in linuxRajKumar Rampelli
It covers the step by step approach on how to write a simple loadable character device driver in linux. What are Device files in linux detail. How user application interact with character driver using a device file.
LAS16-300: Mini Conference 2 Cortex-M Software - Device ConfigurationLinaro
LAS16-300: Mini Conference 2 RTOS-Zephyr - Device Configuration
Speakers: Andy Gross
Date: September 28, 2016
★ Session Description ★
SoC Vendors, board vendors, software middle layers, scripting languages, etc all need to have access to system configuration information (pin muxes, what sensors are on a system, what amount of memory, flash, etc, etc). We need a means to convey this in a vendor neutral mechanism but also one that is friendly for Cortex-M/constrained footprint devices. This session will be to discuss the topic, how its done today, what kinda tooling might exist from different vendors, what we could utilize (device tree) and what issues that creates.
★ Resources ★
Etherpad: pad.linaro.org/p/las16-300
Presentations & Videos: http://connect.linaro.org/resource/las16/las16-300/
★ Event Details ★
Linaro Connect Las Vegas 2016 – #LAS16
September 26-30, 2016
http://www.linaro.org
http://connect.linaro.org
Schema on read is obsolete. Welcome metaprogramming..pdfLars Albertsson
How fast can you modify your data collection to include a new field, make all the necessary changes in data processing and storage, and then use that field in analytics or product features? For many companies, the answer is a few quarters, whereas others do it in a day. This data agility latency has a direct impact on companies' ability to innovate with data. Schema-on-read has been a key strategy to lower that latency - as the community has shifted towards storing data outside relational databases, we no longer need to make series of schema changes through the whole data chain, coordinated between teams to minimise operational risk. Schema-on-read comes with a cost, however. Errors that we used to catch during testing or in early test deployments can now sneak into production undetected and surface as product errors or hard-to-debug data quality problems later than with schema-on-write solutions.
In this presentation, we will show how we have rejected the tradeoff between slow schema change rate and quality to achieve the best of both worlds. By using metaprogramming and versioned pipelines that are tested end-to-end, we can achieve fast schema changes with schema-on-write and the protection of static typing. We will describe the tools in our toolbox - Scalameta, Chimney, Bazel, and custom tools. We will also show how we leverage them to take static typing one step further and differentiate between domain types that share representation, e.g. EmailAddress vs ValidatedEmailAddress or kW vs kWh, while maintaining harmony with data technology ecosystems.
I am explaining how to connect to Borland StarTeam Version Control System programmatically using C# console application and checkout files to local machine.
In this presentation, we try to teach programmers how to avoid security flaws in the code.
The presentation is of the format of problem->solution->problem....
Given a piece of code the attendees have to identify the security bugs in it and the suggest a fix. Now, the attendees have to find security bugs in the fix. The exercise goes on and the attendees become secure code aware.
-- KnowBigData.com
6. What does ls do? How does it work? What does ls do? Lists the contents of directories Displays information about files How does it work? How to list the contents of a directory? How to obtain and display properties of a file? How to determine if a name refers to a file or a directory?
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12. direct structure structdirent { ino_td_ino; /* inode number */ off_td_off; /* offset to the next dirent */ unsigned short d_reclen; /* length of this record */ unsigned char d_type; /* type of file */ char d_name[256]; /* filename */ };
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18. stat structure struct stat { dev_tst_dev; /* ID of device containing file */ ino_tst_ino; /* inode number */ mode_tst_mode; /* protection: type and permission */ nlink_tst_nlink; /* number of hard links */ uid_tst_uid; /* user ID of owner */ gid_tst_gid; /* group ID of owner */ dev_tst_rdev; /* device ID (if special file) */ off_tst_size; /* total size, in bytes */ blksize_tst_blksize; /* blocksize for file system I/O */ blkcnt_tst_blocks; /* number of 512B blocks allocated */ time_tst_atime; /* time of last access */ time_tst_mtime; /* time of last modification */ time_tst_ctime; /* time of last status (properties) change */ };
25. Flag for st_mode field The following flags are defined for the st_mode field: #define S_IFMT 0170000 bit mask for the file type bit fields #define S_IFSOCK 0140000 socket #define S_IFLNK 0120000 symbolic link #define S_IFREG 0100000 regular file #define S_IFBLK 0060000 block device #define S_IFDIR 0040000 directory #define S_IFCHR 0020000 character device #define S_IFIFO 0010000 FIFO
26. Flag for st_mode field The following flags are defined for the st_mode field: #define S_ISUID 0004000 set UID bit #define S_ISGID 0002000 set-group-ID bit (see below) #define S_ISVTX 0001000 sticky bit (see below) #define S_IRWXU 00700 mask for file owner permissions #define S_IRUSR 00400 owner has read permission #define S_IWUSR 00200 owner has write permission #define S_IXUSR 00100 owner has execute permission #define S_IRWXG 00070 mask for group permissions #define S_IRGRP 00040 group has read permission #define S_IWGRP 00020 group has write permission #define S_IXGRP 00010 group has execute permission
27. Flag for st_mode field #define S_IRWXO 00007 mask for permissions for others (not in group) #define S_IROTH 00004 others have read permission #define S_IWOTH 00002 others have write permission #define S_IXOTH 00001 others have execute permission
28. File Type Macros The following POSIX macros are defined to check the file type using the st_mode field: S_ISREG(m) is it a regular file? S_ISDIR(m) directory? S_ISCHR(m) character device? S_ISBLK(m) block device? S_ISFIFO(m) FIFO (named pipe)? S_ISLNK(m) symbolic link? (Not in POSIX.1-1996.) S_ISSOCK(m) socket? (Not in POSIX.1-1996.)
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30. struct passwd The passwd structure is defined in <pwd.h> as follows: structpasswd { char *pw_name; /* username */ char *pw_passwd; /* user password */ uid_tpw_uid; /* user ID */ gid_tpw_gid; /* group ID */ char *pw_gecos; /* real name */ char *pw_dir; /* home directory */ char *pw_shell; /* shell program */ };
31. sprintf #include <stdio.h> main() { char st[5]="test"; char outString[50]=""; sprintf(outString, "This is a %s", st); printf("%s", outString); }
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33. Special Constant Expressions Constant values can be declared explicitly as long values, in fact, by placing the letter L after the constant. long int variable = 23L; variable = 236526598L
34. Advanced programmers, writing systems software, often find it convenient to work with hexadecimal or octal numbers since these number bases have a special relationship to binary. A constant in one of these types is declared by placing either 0 (zero) or 0x in front of the appropriate value.If ddd is a value, then: Octal number 0ddd Hexadecimal number 0xddd
36. Three Special Bits Set-User-ID Bit Example, How can a regular user change his or her password since passwd file is owned by root? -rw-r--r-- 1 rootroot 2391 2009-09-01 10:59 /etc/passwd Solution: Give permission to the program, not to user. The program, /usr/bin/passwd, is owned by root and has the set-user-ID bit set. -rwsr-xr-x 1 root root 29328 2008-04-08 09:49 /usr/bin/passwd
37. Three Special Bits The SUID bit tells the kernel to run the program as though is were being run by the owner of the program. This bit causes the kernel to set the effective user ID to the user ID of the owner of the program. The Set-Group-ID bit: sgid If a program belongs to group g and the set group ID is set, the program runs as though it were being a member of group g.
38. A mask to test for the SUID Bit #define S_ISUID 0004000 0000 100 000 000 000 A mask to test for the SGID Bit #define S_ISGID0002000 0000 010 000 000 000 Indicates a octal number suid Other group User sgid Other group User Other Other
39. Three Special Bits The Sticky bit: The sticky bit tells the kernel to keep the program on the swap device even if no one is using it. The sway device is faster than hard disk because no fragments happen.
40. Understanding file permissions on Unix: a brief tutorial http://www.dartmouth.edu/~rc/help/faq/permissions.html -rw-rw---- 2 richard staff 12040 Aug 20 1996 admin/userinfo drwxr-xr-x 3 richard user 2048 May 13 09:27 public s in the place where 'x' would normally go is called the set-UID or set-groupID flag.