unistd(4) — 4D1 2.0



     UNISTD(4)                                               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" */

          /*Pathnames:*/

          #define GF_PATH     /etc/group/*Pathname of the group file */
          #define PF_PATH     /etc/passwd/*Pathname of the passwd file */

     ORIGIN
          AT&T V.3



















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