libopeniscsiusr.h(3)

NAME
libopeniscsiusr.h - iSCSI userspace API.

SYNOPSIS
#include <libopeniscsiusr/libopeniscsiusr.h>

DESCRIPTION

All the libopeniscsiusr public functions ship their own man pages. You may use 'man -k iscsi' to find out and use 'man 3 <function_name>' to check the detail usage.

USAGE

To use libopeniscsiusr in your project, we suggest to use the 'pkg-config' way:

 * Add this line into your configure.ac:

    PKG_CHECK_MODULES([LIBISCSIUSR], [libopeniscsiusr])

 * Add these lines into your Makefile.am:

    foo_LDFLAGS += $(LIBISCSIUSR_LIBS)
    foo_CFLAGS += $(LIBISCSIUSR_CFLAGS)

LOG HANDLING

The log handler function could be set via 'iscsi_context_log_func_set()'. The log priority could be set via 'iscsi_context_log_priority_set()'.

By default, the log priorities is 'LIBISCSI_LOG_PRIORITY_WARNING'. By default, the log handler is print log to STDERR, and its code is listed below in case you want to take it as an example to create your own log handler.

        #define _ISCSI_LOG_STRERR_ALIGN_WIDTH 80

        void _iscsi_log_stderr(struct iscsi_context *ctx, int priority,
                        const char *file, int line,
                        const char *func_name,
                        const char *format, va_list args)
        {
                int printed_bytes = 0;

                printed_bytes += fprintf(stderr, "iSCSI %s: ",
                        iscsi_log_priority_str(priority));
                printed_bytes += vfprintf(stderr, format, args);

                if (printed_bytes < _ISCSI_LOG_STRERR_ALIGN_WIDTH) {
                        fprintf(stderr, "%*s # %s:%s():%d,
                        _ISCSI_LOG_STRERR_ALIGN_WIDTH - printed_bytes,
                        "", file, func_name, line);
                } else {
                        fprintf(stderr, " # %s:%s():%d, file, func_name,
                        line);
                }
        }

SAMPLE CODE

        struct iscsi_context *ctx = NULL;
        struct iscsi_session **ses = NULL;
        uint32_t se_count = 0;
        uint32_t i = 0;
        int rc = EXIT_SUCCESS;

        ctx = iscsi_context_new();
        iscsi_context_log_priority_set(ctx, LIBISCSI_LOG_PRIORITY_DEBUG);

        if (iscsi_sessions_get(ctx, &ses, &se_count) != LIBISCSI_OK) {
                printf("FAILED);
                rc = EXIT_FAILURE;
        } else {
                printf("ot %" PRIu32 " iSCSI sessions, se_count);
                for (i = 0; i < se_count; ++i)
                        printf("SID is %" PRIu32 ",
                        iscsi_session_sid_get(ses[i]));
                iscsi_sessions_free(ses, se_count);
        }
        iscsi_context_free(ctx);
        exit(rc);

LICENSE
LGPLv3+

BUG
Please report bug to https://github.com/open-iscsi/open-iscsi/issues