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https://github.com/ibm-s390-linux/s390-tools.git
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7df8edd88a
Change the buffer size to what we actually need and use util_strlcpy() to correctly copy strings. This gets rid of the following GCC8 compile warnings: fcp.c: In function ‘fcp_wwpn_get’: fcp.c:44:2: warning: ‘strncpy’ output may be truncated copying 20 bytes from a string of length 4095 [-Wstringop-truncation] strncpy(wwpn, buf, 20); ^~~~~~~~~~~~~~~~~~~~~~ fcp.c: In function ‘fcp_lun_get’: fcp.c:65:2: warning: ‘strncpy’ output may be truncated copying 20 bytes from a string of length 4095 [-Wstringop-truncation] strncpy(lun, buf, 20); ^~~~~~~~~~~~~~~~~~~~~ Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
89 lines
1.9 KiB
C
89 lines
1.9 KiB
C
/*
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* ipl_tools - Linux for System z reipl and shutdown tools
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*
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* FCP device functions
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*
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* Copyright IBM Corp. 2008, 2017
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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 "lib/util_libc.h"
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#include "ipl_tools.h"
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/*
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* Check if the specified device number is a valid device number
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* which can be found in the /sys/bus/ccw/drivers/zfcp/ structure
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*/
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int fcp_is_device(const char *devno)
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{
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char path[PATH_MAX];
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snprintf(path, sizeof(path), "/sys/bus/ccw/drivers/zfcp/%s", devno);
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if (chdir(path) != 0)
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return 0;
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return 1;
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}
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/*
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* Return the wwpn of a device
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*/
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void fcp_wwpn_get(const char *device, char *wwpn)
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{
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char path[PATH_MAX], buf[20];
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FILE *fh;
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int rc;
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snprintf(path, sizeof(path), "/sys/block/%s/device/wwpn", device);
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fh = fopen(path, "r");
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if (fh == NULL)
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ERR_EXIT_ERRNO("Could not open \"%s\"", path);
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rc = fscanf(fh, "%s", buf);
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if (rc <= 0)
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ERR_EXIT("Could not lookup WWPN \"%s\"", path);
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util_strlcpy(wwpn, buf, 20);
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fclose(fh);
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}
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/*
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* Return the lun of a device
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*/
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void fcp_lun_get(const char *device, char *lun)
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{
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char path[PATH_MAX], buf[20];
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FILE *fh;
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int rc;
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snprintf(path, sizeof(path), "/sys/block/%s/device/fcp_lun", device);
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fh = fopen(path, "r");
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if (fh == NULL)
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ERR_EXIT_ERRNO("Could not open \"%s\"", path);
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rc = fscanf(fh, "%s", buf);
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if (rc <= 0)
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ERR_EXIT("Could not lookup LUN \"%s\"", path);
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util_strlcpy(lun, buf, 20);
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fclose(fh);
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}
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/*
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* Return the device number of a device
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*/
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void fcp_busid_get(const char *device, char *devno)
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{
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char buf[4096], path[PATH_MAX];
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FILE *fh;
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int rc;
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snprintf(path, sizeof(path), "/sys/block/%s/device/hba_id", device);
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fh = fopen(path, "r");
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if (fh == NULL)
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ERR_EXIT_ERRNO("Could not open \"%s\"", path);
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rc = fscanf(fh, "%s", buf);
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if (rc <= 0)
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ERR_EXIT("Could not find device \"%s\"", path);
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strcpy(devno, buf);
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fclose(fh);
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}
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