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IOC mediator: add check_dir function to avoid symbol link failure
To avoid PTY device symbol link failure due to non-exist directory passed from parameter. Add check_dir function to check the directory and create it if not exist. Signed-off-by: Yuan Liu <yuan1.liu@intel.com> Reviewed-by: Yu Wang <yu1.wang@intel.com> Reviewed-by: Zhao Yakui <yakui.zhao@intel.com> Acked-by: Eddie Dong <eddie.dong@intel.com>
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@ -60,6 +60,7 @@
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#include <string.h>
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#include <stdbool.h>
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#include <types.h>
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#include <libgen.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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@ -552,6 +553,33 @@ ioc_open_native_ch(const char *dev_name)
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return fd;
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}
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/*
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* Check and create the directory.
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* To avoid symlink failure if the directory does not exist.
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*/
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static int
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check_dir(const char *file)
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{
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char *tmp, *dir;
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tmp = strdup(file);
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if (!tmp) {
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DPRINTF("ioc falied to dup file, error:%s\r\n",
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strerror(errno));
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return -1;
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}
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dir = dirname(tmp);
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if (access(dir, F_OK) && mkdir(dir, 0666)) {
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DPRINTF("ioc falied to create dir:%s, erorr:%s\r\n", dir,
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strerror(errno));
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free(tmp);
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return -1;
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}
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free(tmp);
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return 0;
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}
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/*
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* Open PTY master device for IOC mediator and the PTY slave device for virtual
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* UART. The pair(master/slave) can work as a communication channel between
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@ -576,6 +604,12 @@ ioc_open_virtual_uart(const char *dev_name)
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goto pty_err;
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if ((unlink(dev_name) < 0) && errno != ENOENT)
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goto pty_err;
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/*
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* The check_dir restriction is that only create one directory
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* not support multi-level directroy.
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*/
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if (check_dir(dev_name) < 0)
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goto pty_err;
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if (symlink(slave_name, dev_name) < 0)
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goto pty_err;
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if (chmod(dev_name, 0660) < 0)
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