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/usr/bin/ld: ../..//libutil/libutil.a(util_sys.o): in function `util_sys_get_dev_addr': /home/builder/s390-tools/libutil/util_sys.c:52: undefined reference to `major' /usr/bin/ld: /home/builder/s390-tools/libutil/util_sys.c:53: undefined reference to `minor' collect2: error: ld returned 1 exit status make[2]: *** [../../common.mak:243: zipl] Error 1 make[1]: *** [Makefile:8: all] Error 2 make: *** [Makefile:52: zipl] Error 2 Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
/*
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* util - Utility function library
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*
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* SysFS helper functions
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*
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* Copyright IBM Corp. 2019
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*
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* s390-tools is free software; you can redistribute it and/or modify
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* it under the terms of the MIT license. See LICENSE for details.
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*/
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#include <err.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/sysmacros.h>
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#include <unistd.h>
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#include "lib/util_path.h"
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#include "lib/util_sys.h"
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/* lstat() doesn't work for sysfs files, a fixed size is therefore inevitable */
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#define READLINK_SIZE 256
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/**
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* Identify device address
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*
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* Identifying the device address with this function works for almost any
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* character and block device (e.g. NVMe, SCSI, DASD, etc).
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* The user must provide a buffer that is large enough for the desired device
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* address to be read into \p addr.
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*
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* @param[in] dev Device node of interest
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* @param[out] addr Identified device address
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*
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* @retval 0 Success
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* @retval -1 Error while reading device information or
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* constructed path
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*/
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int util_sys_get_dev_addr(const char *dev, char *addr)
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{
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char device[READLINK_SIZE], *result;
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unsigned int maj, min;
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struct stat s;
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ssize_t len;
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char *path;
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if (stat(dev, &s) != 0)
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return -1;
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maj = major(s.st_rdev);
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min = minor(s.st_rdev);
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if (S_ISBLK(s.st_mode))
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path = util_path_sysfs("dev/block/%u:%u/device", maj, min);
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else if (S_ISCHR(s.st_mode))
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path = util_path_sysfs("dev/char/%u:%u/device", maj, min);
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else
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return -1;
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len = readlink(path, device, READLINK_SIZE - 1);
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free(path);
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if (len != -1)
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device[len] = '\0';
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else
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return -1;
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result = strrchr(device, '/');
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if (result)
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result++;
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else
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result = device;
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strcpy(addr, result);
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return 0;
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}
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