unistd(4) — Interactive 2.2



          UNISTD(4)            INTERACTIVE UNIX System            UNISTD(4)



          NAME
               unistd - file header for symbolic constants

          SYNOPSIS
               #include <unistd.h>

          DESCRIPTION
               The header file <unistd.h> lists the symbolic constants and
               structures not already defined or declared in some other
               header file.

               /* Symbolic constants for the "access" routine: */

               #define R_OK 4     /*Test for Read permission */
               #define W_OK 2     /*Test for Write permission */
               #define X_OK 1     /*Test for eXecute permission */
               #define F_OK 0     /*Test for existence of File */

               #define F_ULOCK    0    /*Unlock a previously locked region */
               #define F_LOCK     1    /*Lock a region for exclusive use */
               #define F_TLOCK    2    /*Test and lock a region for exclusive use */
               #define F_TEST     3    /*Test a region for other processes locks */

               /*Symbolic constants for the "lseek" routine: */

               #define SEEK_SET   0    /* Set file pointer to "offset" */
               #define SEEK_CUR   1    /* Set file pointer to current plus "offset" */
               #define SEEK_END   2    /* Set file pointer to EOF plus "offset" */

               /*Path names:*/

               #define GF_PATH  "/etc/group"/*Path name of the group file */
               #define PF_PATH  "/etc/passwd"/*Path name of the passwd file */






















          Rev.                                                       Page 1
Museum
