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Explain why errno is set to 0

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This commit is contained in:
Andrea Mazzoleni 2016-09-23 16:46:54 +02:00
parent f31dfada3e
commit 29fb2b22a2
1 changed files with 7 additions and 1 deletions
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8
cmdline/scan.c
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@ -1162,7 +1162,13 @@ static int scan_dir(struct snapraid_scan* scan, int level, int is_diff, const ch
struct dirent* dd;
size_t name_len;
/* clear errno to detect erroneous conditions */
/*
* Clear errno to differentiate the end of the stream and an error condition
*
* From the Linux readdir() manpage:
* "If the end of the directory stream is reached, NULL is returned and errno is not changed.
* If an error occurs, NULL is returned and errno is set appropriately."
*/
errno = 0;
dd = readdir(d);
if (dd == 0 && errno != 0) {