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project_walk - visit active project IDs on current system

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 prematurely; 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

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\en", 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)