Changeset: cb21ff8b1379 for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=cb21ff8b1379
Modified Files:
common/stream/stream.c
Branch: Oct2020
Log Message:
Use proper feature test for strerror_r and suppress warning
Distinguish xsi strerror_r and gnu strerror_r using the #if
given by the manual page (on Linux) instead of testing for
STRERROR_R_CHAR_R
Also, with the XSI strerror_r, check the return code.
diffs (44 lines):
diff --git a/common/stream/stream.c b/common/stream/stream.c
--- a/common/stream/stream.c
+++ b/common/stream/stream.c
@@ -403,26 +403,27 @@ my_strerror_r(int error_nr, char *buf, s
// 1. no strerror_r
// 2. gnu strerror_r (returns char* and does not always fill buffer)
// 3. xsi strerror_r (returns int and always fills the buffer)
- char *ret;
+ char *to_move;
#ifndef HAVE_STRERROR_R
// Hope for the best
- ret = strerror(error_nr);
-#else
-#ifdef STRERROR_R_CHAR_P
- // gnu strerror_r
- ret = strerror_r(error_nr, buf, buflen);
+ to_move = strerror(error_nr);
+#elif (_POSIX_C_SOURCE >= 200112L) && !_GNU_SOURCE
+ // standard strerror_r always writes to buf
+ int result_code = strerror_r(error_nr, buf, buflen);
+ if (result_code == 0)
+ to_move = NULL;
+ else
+ to_move = "<failed to retrieve error message>";
#else
- // standard strerror_r
- (void) strerror_r(error_nr, buf, buflen);
- ret = NULL;
+ // gnu strerror_r sometimes only returns static string, needs copy
+ to_move = strerror_r(error_nr, buf, buflen);
#endif
-#endif
- if (ret != NULL) {
+ if (to_move != NULL) {
// move to buffer
- size_t size = strlen(ret) + 1;
+ size_t size = strlen(to_move) + 1;
assert(size <= buflen);
// strerror_r may have return a pointer to/into the buffer
- memmove(buf, ret, size);
+ memmove(buf, to_move, size);
return size - 1;
} else {
return strlen(buf);
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