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getgrent() and friends should set errno if there is an error.

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Also, clarify the manpage description of when errno is set and
explain that clients should set errno=0 first if they want useful
error information.
This commit is contained in:
Tim Kientzle 2004-05-17 22:15:49 +00:00
parent 922013a665
commit 9b8f137b2d
2 changed files with 8 additions and 1 deletions
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6
lib/libc/gen/getgrent.3
View File

@ -168,9 +168,13 @@ and
return a pointer to a group structure on success or
.Dv NULL
if the entry is not found or if an error occurs.
In the latter case,
If an error does occur,
.Va errno
will be set.
Note that programs must explicitly set
.Va errno
to zero before calling any of these functions if they need to
distinguish between a non-existent entry and an error.
The functions
.Fn getgrent_r ,
.Fn getgrnam_r ,

3
lib/libc/gen/getgrent.c
View File

@ -307,6 +307,7 @@ getgr(int (*fn)(union key, struct group *, char *, size_t, struct group **),
free(grp_storage);
if ((grp_storage_size << 1) > GRP_STORAGE_MAX) {
grp_storage = NULL;
errno = ERANGE;
return (NULL);
}
grp_storage_size <<= 1;
@ -315,6 +316,8 @@ getgr(int (*fn)(union key, struct group *, char *, size_t, struct group **),
return (NULL);
}
} while (res == NULL && rv == ERANGE);
if (rv != 0)
errno = rv;
return (res);
}