What is the difference between exit 0 and exit 1 in C

Question

Can anyone tell me  What is the difference between exit 0  and exit 1  in C language

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When the executable ends  exits  it returns a value to the shell that ran it  exit 0  usually indicates that all is well  whilst exit 1  indicates that something has gone amiss

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exit 0  is equivalent to exit EXIT SUCCESS    exit 1  is equivalent to exit EXIT FAILURE    On failure normally any positive value get returned to exit the process  that you can find on shell by using      Value more than 128 that is caused the termination by signal  So if any shell command terminated by signal the return status must be  128 signal number     For example    If any shell command is terminated by SIGINT then    will give 130   128 2   Here 2 is signal number for SIGINT  check by using kill -l

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exit 0  indicates that the program terminated without errors  exit 1  indicates that there were an error   You can use different values other than 1 to differentiate between different kind of errors

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exit function   In the C Programming Language  the exit function calls all functions registered with at exit and terminates the program    exit 1  means program process  terminate unsuccessfully  File buffers are flushed  streams are closed  and temporary files are deleted  exit 0  means Program Process  terminate  successfully

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exit 0  means Program Process  terminate normally successfully    exit 1  means program process  terminate normally unsuccessfully    If you want to observe this thing you must know signal handling and process management in Unix      know about sigaction  watipid    for     such    API

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exit is a system call used to finish a running process from which it is called  The parameter to exit is used to inform the parent process about the status of child process  So  exit 0  can be used  and often used  to indicate successful execution of a process and exit 1  to flag an error  reference link

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exit in the C language takes an integer representing an exit status   Exit Success  Typically  an exit status of 0 is considered a success  or an intentional exit caused by the program s successful execution   Exit Failure  An exit status of 1 is considered a failure  and most commonly means that the program had to exit for some reason  and was not able to successfully complete everything in the normal program flow   Here s a GNU Resource talking about Exit Status     As  Als has stated  two constants should be used in place of 0 and 1   EXIT SUCCESS is defined by the standard to be zero   EXIT FAILURE is not restricted by the standard to be one  but many systems do implement it as one

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What is the difference between exit 0  and exit 1  in C language   exit 0  indicates successful program termination  amp  it is fully portable  While exit 1   usually  indicates unsucessful termination  However  it s usage is non-portable   Note that the C standard defines EXIT SUCCESS and EXIT FAILURE to return termination status from a C program   0 and EXIT SUCCESS are the values specified by the standard to indicate successful termination  however  only EXIT FAILURE is the standard value for returning unsucessful termination  1 is used for the same in many implementations though     Reference       C99 Standard     7 20 4 3 The exit function Para 5         Finally  control is returned to the host environment  If the value of status is zero or   EXIT SUCCESS  an implementation-de ned form of the status successful termination is   returned  If the value of status is EXIT FAILURE   an implementation-de ned form   of the status unsuccessful termination is returned  Otherwise the status returned is   implementation-de ned

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exit 0  behave like return 0 in main   function  exit 1  behave like return 1  The standard is  that main function return 0  if program ended successfully while non-zero value means that program was terminated with some kind of error

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The difference is the value returned to the environment is 0 in the former case and 1 in the latter case       prog with exit 0   echo    0     and      prog with exit 1   echo    1     Also note that the macros value  EXIT SUCCESS and EXIT FAILURE used as an argument to exit function are implementation defined but are usually set to respectively 0 and a non-zero number   POSIX requires EXIT SUCCESS to be 0   So usually exit 0  means a success and exit 1  a failure   An exit function call with an argument in main function is equivalent to the statement return with the same argument

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exit   should always be called with an integer value and non-zero values are used as error codes   See also  Use of exit   function

[c] What is the difference between exit(0) and exit(1) in C?

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