When to define functions in C?

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stat.h

stat.h(3HEAD)                                                         Headers                                                        stat.h(3HEAD)

NAME

       stat.h, stat - data returned by stat system call

SYNOPSIS

       #include <sys/types.h>

       #include <sys/stat.h>

DESCRIPTION

       The system calls stat, lstat and fstat return data in a stat structure, which is defined in <stat.h>.

       The constants used in the st_mode field are also defined in this file:

       #define    S_IFMT           /* type of file */
       #define    S_IAMB           /* access mode bits */
       #define    S_IFIFO          /* fifo */
       #define    S_IFCHR          /* character special */
       #define    S_IFDIR          /* directory */
       #define    S_IFNAM          /* XENIX special named file */
       #define    S_INSEM          /*  XENIX  semaphore  subtype  of
                                   IFNAM */
       #define    S_INSHD          /* XENIX shared data  subtype  of
                                   IFNAM */
       #define    S_IFBLK          /* block special */
       #define    S_IFREG          /* regular */
       #define    S_IFLNK          /* symbolic link */
       #define    S_IFSOCK         /* socket */
       #define    S_IFDOOR         /* door */
       #define    S_ISUID          /* set user id on execution */
       #define    S_ISGID          /* set group id on execution */
       #define    S_ISVTX          /*  save  swapped text even after
                                   use */
       #define    S_IREAD          /* read permission, owner */
       #define    S_IWRITE         /* write permission, owner */
       #define    S_IEXEC          /*   execute/search   permission,
                                   owner */
       #define    S_ENFMT          /*   record  locking  enforcement
                                   flag */
       #define    S_IRWXU          /* read, write, execute: owner */
       #define    S_IRUSR          /* read permission: owner */
       #define    S_IWUSR          /* write permission: owner */
       #define    S_IXUSR          /* execute permission: owner */
       #define    S_IRWXG          /* read, write, execute: group */
       #define    S_IRGRP          /* read permission: group */
       #define    S_IWGRP          /* write permission: group */
       #define    S_IXGRP          /* execute permission: group */
       #define    S_IRWXO          /* read, write, execute: other */
       #define    S_IROTH          /* read permission: other */
       #define    S_IWOTH          /* write permission: other */
       #define    S_IXOTH          /* execute permission: other */

       The following macros are for POSIX conformance (see standards(5)):

       #define    S_ISBLK(mode)    block special file
       #define    S_ISCHR(mode)    character special file
       #define    S_ISDIR(mode)    directory file
       #define    S_ISFIFO(mode)   pipe or fifo file
       #define    S_ISREG(mode)    regular file

       #define    S_ISSOCK(mode)   socket file

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Interface Stability          |Standard                     |
       +-----------------------------+-----------------------------+

SEE ALSO

       stat(2), types.h(3HEAD), attributes(5), standards(5)

SunOS 5.10                                                          30 Aug 2002                                                      stat.h(3HEAD)

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