Creation Zone

  • Subscribe to our RSS feed.
  • Twitter
  • StumbleUpon
  • Reddit
  • Facebook
  • Digg

Monday, 10 January 2005

Life cycle of a C/C++ program

Posted on 16:23 by Unknown
1) Write the program



eg.,



int main (int argc, char *argv[]) {

printf ("Hello World");

}



2) Compile the program



When the program gets compiled, the compiler realizes that the current compile unit (ie., the simple C program in this case) has no implementation for printf(), and therefore produces an entry in the object file's symbol table saying that printf() has an `unresolved reference'. And the compiler generates an object file (.o file) if there were no syntax errors in the program



3) Link the object file(s)



The next phase is to link the object files to produce an executable. During linking, the static linker (ld) sees the unresolved reference to printf() and searches the available libraries for an implementation for printf(). In general this will be found in the C library (libC on Solaris). Now, the linker has two options:



* It (linker) can take the printf() implementation from the library and copy it into the final executable. The linker then searches the printf() implemenation for other unresolved references, and again consult the libraries for resolution. This process will be performed iteratively until all references to the symbols were resolved. This is known as static linking



* If the C library is realized as a `shared library', the linker can simply put a reference to the C library into the final executable. Still the linker performs symbol resolution checking as above, to determine if the reference to the printf() function necessiates further references to other (shared or nonshared) libraries. This is known as dynamic linking



4) Run the executable



What happens when you run the executable, depends on whether it was linked statically or dynamically:



* A statically linked executable is self contained. It is loaded into memory. The entry point, whose designation is system dependent (for eg, the `__main' symbol) is found and called. This entry function, usually provided by the compiler or a library, performs some setup and initialization and then calls the user-defined main() function and the instructions inside main() function gets executed



* In a dynamically linked executable, after loading the executable binary into memory, the dynamic linker (ld.so.1) takes control first. It reads the library references to dynamic libraries produced by the static linker, and loads them into memory. It then performs symbol resolution again and updates all references to symbols in the shared library to point to their actual location, which can only be determined at runtime, because the shared libraries might be loaded to different memory locations each time the executable binary gets executed



The dynamic linker also has the option to abort the execution if the dynamic linking fails - for example if the shared library has been modified, and a reference known to the static linker isn't available any more
Email ThisBlogThis!Share to XShare to Facebook
Posted in | No comments
Newer Post Older Post Home

0 comments:

Post a Comment

Subscribe to: Post Comments (Atom)

Popular Posts

  • *nix: Workaround to cannot find zipfile directory in one of file.zip or file.zip.zip ..
    Symptom: You are trying to extract the archived files off of a huge (any file with size > 2 GB or 4GB, depending on the OS) ZIP file with...
  • C/C++: Printing Stack Trace with printstack() on Solaris
    libc on Solaris 9 and later, provides a useful function called printstack , to print a symbolic stack trace to the specified file descripto...
  • JDS: Installing Sun Java Desktop System 2.0
    This document will guide you through the process of installing JDS 2.0 on a PC from integrated CDROM images Requirements I...
  • Binary compatibility
    What's It? "Binary compatibility" (BC) is the ability of one machine to run software that was written for another without hav...
  • Solaris: NULL pointer bugs & /usr/lib/0@0.so.1 library
    Some programmers assume that a NULL character pointer is the same as a pointer to a NULL string. However de-referencing a NULL pointer (ie.,...
  • Database: Oracle Server Architecture (overview)
    Oracle server consists of the following core components: 1) database(s) & 2) instance(s) 1) database consists of: 1) datafil...
  • Sun: OpenJDK
    Open source JDK, that is. Sun Microsystems did it again -- As promised during JavaOne event back in May 2006, Sun made the implementation of...
  • Consolidating Siebel CRM 8.0 on a Single Sun SPARC Enterprise Server, T5440
    .. blueprint document is now available on wikis.sun.com . Here is the direct link to the blueprint:              Consolidating Oracle Siebel...
  • Oracle Internet Directory 11g Benchmark on SPARC T5
    SUMMARY System Under Test (SUT)     Oracle's SPARC T5-2 server Software     Oracle Internet Directory 11 g R1-PS6 Target Load     50...
  • Fix to Firefox 3 Crash on Solaris 10 x86
    Symptom : Firefox 3 crashes on Solaris 10 x86 when the web browser tries to render some of the HTML pages with SWF content in them. For exam...

Categories

  • 80s music playlist
  • bandwidth iperf network solaris
  • best
  • black friday
  • breakdown database groups locality oracle pmap sga solaris
  • buy
  • deal
  • ebiz ebs hrms oracle payroll
  • emca oracle rdbms database ORA-01034
  • friday
  • Garmin
  • generic+discussion software installer
  • GPS
  • how-to solaris mmap
  • impdp ora-01089 oracle rdbms solaris tips upgrade workarounds zombie
  • Magellan
  • music
  • Navigation
  • OATS Oracle
  • Oracle Business+Intelligence Analytics Solaris SPARC T4
  • oracle database flashback FDA
  • Oracle Database RDBMS Redo Flash+Storage
  • oracle database solaris
  • oracle database solaris resource manager virtualization consolidation
  • Oracle EBS E-Business+Suite SPARC SuperCluster Optimized+Solution
  • Oracle EBS E-Business+Suite Workaround Tip
  • oracle lob bfile blob securefile rdbms database tips performance clob
  • oracle obiee analytics presentation+services
  • Oracle OID LDAP ADS
  • Oracle OID LDAP SPARC T5 T5-2 Benchmark
  • oracle pls-00201 dbms_system
  • oracle siebel CRM SCBroker load+balancing
  • Oracle Siebel Sun SPARC T4 Benchmark
  • Oracle Siebel Sun SPARC T5 Benchmark T5-2
  • Oracle Solaris
  • Oracle Solaris Database RDBMS Redo Flash F40 AWR
  • oracle solaris rpc statd RPC troubleshooting
  • oracle solaris svm solaris+volume+manager
  • Oracle Solaris Tips
  • oracle+solaris
  • RDC
  • sale
  • Smartphone Samsung Galaxy S2 Phone+Shutter Tip Android ICS
  • solaris oracle database fmw weblogic java dfw
  • SuperCluster Oracle Database RDBMS RAC Solaris Zones
  • tee
  • thanksgiving sale
  • tips
  • TomTom
  • windows

Blog Archive

  • ►  2013 (16)
    • ►  December (3)
    • ►  November (2)
    • ►  October (1)
    • ►  September (1)
    • ►  August (1)
    • ►  July (1)
    • ►  June (1)
    • ►  May (1)
    • ►  April (1)
    • ►  March (1)
    • ►  February (2)
    • ►  January (1)
  • ►  2012 (14)
    • ►  December (1)
    • ►  November (1)
    • ►  October (1)
    • ►  September (1)
    • ►  August (1)
    • ►  July (1)
    • ►  June (2)
    • ►  May (1)
    • ►  April (1)
    • ►  March (1)
    • ►  February (1)
    • ►  January (2)
  • ►  2011 (15)
    • ►  December (2)
    • ►  November (1)
    • ►  October (2)
    • ►  September (1)
    • ►  August (2)
    • ►  July (1)
    • ►  May (2)
    • ►  April (1)
    • ►  March (1)
    • ►  February (1)
    • ►  January (1)
  • ►  2010 (19)
    • ►  December (3)
    • ►  November (1)
    • ►  October (2)
    • ►  September (1)
    • ►  August (1)
    • ►  July (1)
    • ►  June (1)
    • ►  May (5)
    • ►  April (1)
    • ►  March (1)
    • ►  February (1)
    • ►  January (1)
  • ►  2009 (25)
    • ►  December (1)
    • ►  November (2)
    • ►  October (1)
    • ►  September (1)
    • ►  August (2)
    • ►  July (2)
    • ►  June (1)
    • ►  May (2)
    • ►  April (3)
    • ►  March (1)
    • ►  February (5)
    • ►  January (4)
  • ►  2008 (34)
    • ►  December (2)
    • ►  November (2)
    • ►  October (2)
    • ►  September (1)
    • ►  August (4)
    • ►  July (2)
    • ►  June (3)
    • ►  May (3)
    • ►  April (2)
    • ►  March (5)
    • ►  February (4)
    • ►  January (4)
  • ►  2007 (33)
    • ►  December (2)
    • ►  November (4)
    • ►  October (2)
    • ►  September (5)
    • ►  August (3)
    • ►  June (2)
    • ►  May (3)
    • ►  April (5)
    • ►  March (3)
    • ►  February (1)
    • ►  January (3)
  • ►  2006 (40)
    • ►  December (2)
    • ►  November (6)
    • ►  October (2)
    • ►  September (2)
    • ►  August (1)
    • ►  July (2)
    • ►  June (2)
    • ►  May (4)
    • ►  April (5)
    • ►  March (5)
    • ►  February (3)
    • ►  January (6)
  • ▼  2005 (72)
    • ►  December (5)
    • ►  November (2)
    • ►  October (6)
    • ►  September (5)
    • ►  August (5)
    • ►  July (10)
    • ►  June (8)
    • ►  May (9)
    • ►  April (6)
    • ►  March (6)
    • ►  February (5)
    • ▼  January (5)
      • C/C++: External linkage with extern "C"
      • Life cycle of a C/C++ program
      • 2s complement
      • Binary compatibility
      • Solaris: Tips
  • ►  2004 (36)
    • ►  December (1)
    • ►  November (5)
    • ►  October (12)
    • ►  September (18)
Powered by Blogger.

About Me

Unknown
View my complete profile