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Full Discussion: Segmentation fault in fopen when in write mode.
Top Forums Programming Segmentation fault in fopen when in write mode. Post 302672519 by alister on Monday 16th of July 2012 12:31:24 PM
Old 07-16-2012
You are mistaken. This use of a fixed-width type makes your code less portable. However, this mistake is unlikely to cause a problem so long as you work with the widely-available 32 and 64 bit platforms.

As I recall, C requires main() to return int or void. If main() takes any arguments, argc must be an int.

On UNIX and Windows NT, on both 32-bit and 64-bit platforms, the data models specify a 32 bit int. On such platforms, int32_t is implemented using a typedef (or two) which essentially aliases int32_t to int, which is what the standard requires. So long as this is the case, the compiler is happy.

But, what would happen if you tried to compile that on a 16 bit machine? On a 16 bit machine, int32_t may be implemented with long. If that's the case, your code won't compile (if it does, there will likely be serious problems). A similar problem could arise if this code were compiled on a 64 bit architecture with 64 bit ints.

Regards,
Alister
This User Gave Thanks to alister For This Post:
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LEARN ABOUT REDHAT

types32.h

types32.h(3HEAD)                                                      Headers                                                     types32.h(3HEAD)

NAME

       types32.h, types32 - fixed-width data types

SYNOPSIS

       #include <sys/types32.h>

DESCRIPTION

       The  following  fixed-width  data types defined in <sys/types32.h> correspond to the sign and sizes of types in the 32-bit environment that
       can be used for compatibility and interoperability purposes in either the 32-bit or 64-bit environment.

       typedef              int32_t               blkcnt32_t
       typedef              uint32_t              caddr32_t
       typedef              int32_t               clock32_t
       typedef              int32_t               daddr32_t
       typedef              uint32_t              dev32_t
       typedef              uint32_t              fsblkcnt32_t
       typedef              uint32_t              fsfilcnt32_t
       typedef              int32_t               gid32_t
       typedef              int32_t               id32_t
       typedef              uint32_t              ino32_t
       typedef              int32_t               key32_t
       typedef              uint32_t              major32_t
       typedef              uint32_t              minor32_t
       typedef              uint32_t              mode32_t
       typedef              uint32_t              nlink32_t
       typedef              int32_t               pid32_t
       typedef              uint32_t              rlim32_t
       typedef              uint32_t              size32_t
       typedef              int32_t               ssize32_t
       typedef              time32_t              int32_t
       typedef              uid32_t               int32_t

SunOS 5.10                                                          30 Oct 1997                                                   types32.h(3HEAD)
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