project_walk(3project) [osx man page]

project_walk(3PROJECT)                                                                                                      project_walk(3PROJECT)

NAME

       project_walk - visit active project IDs on current system

SYNOPSIS

       cc [ flag ... ] file... -lproject [ library ... ]
       #include <project.h>

       int project_walk(int (*callback)(const projid_t project, void *walk_data), void *init_data);

       The  project_walk()  function  provides  a  mechanism for the application author to examine all active projects on the current system.  The
       callback function provided by the application is given the ID of an active project at each invocation and can use the walk_data  to  record
       its  own  state.  The callback function should return non-zero if it encounters an error condition or attempts to terminate the walk prema-
       turely; otherwise the callback function should return 0.

       Upon successful completion, project_walk() returns 0. It returns -1 if the callback function returned a  non-zero  value  or  if  the  walk
       encountered an error, in which case errno is set to indicate the error.

       The project_walk() function will fail if:

       ENOMEM          There is insufficient memory available to set up the initial data for the walk.

       Other returned error values are presumably caused by the callback function.

       Example 1: Count the number of projects available on the system.

       The following example counts the number of projects available on the system.

       #include <sys/types.h>
       #include <project.h>
       #include <stdio.h>

       typedef struct wdata {
            uint_t count;
       } wdata_t;

       wdata_t total_count;

       int
       simple_callback(const projid_t p, void *pvt)
       {
            wdata_t *w = (wdata_t *)pvt;
            w->count++;
            return(0);
       }

       ...

       total_count.count = 0;
       errno = 0;
       if ((n = project_walk(simple_callback, &total_count)) >= 0)
            (void) printf("count = %u
", total_count.count);

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Interface Stability          |Evolving                     |
       +-----------------------------+-----------------------------+
       |MT-Level                     |MT-Safe                      |
       +-----------------------------+-----------------------------+

       getprojid(2), libproject(3LIB), settaskid(2), attributes(5)

                                                                    7 Oct 2003                                              project_walk(3PROJECT)