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commit 8915eacef88eb25ac94e6bb37b473adb326e9d1b
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Author: Joseph Myers <joseph@codesourcery.com>
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Date: Wed Nov 26 20:54:16 2014 +0000
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Avoid warnings for unused results in nscd/connections.c.
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This patch avoids warnings for unused results of setuid and setgid in
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nscd/connections.c using an ignore_value macro along the lines
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suggested by Paul in
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<https://sourceware.org/ml/libc-alpha/2014-11/msg00733.html>.
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Tested for x86_64.
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* include/libc-internal.h (ignore_value): New macro.
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* nscd/connections.c (restart): Wrap calls to setuid and setgid
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with ignore_value.
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diff --git a/include/libc-internal.h b/include/libc-internal.h
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index 78f82da58a2c334b..2ced1c17d3dff93d 100644
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--- a/include/libc-internal.h
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+++ b/include/libc-internal.h
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@@ -70,4 +70,10 @@ extern void __init_misc (int, char **, char **);
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#define PTR_ALIGN_UP(base, size) \
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((__typeof__ (base)) ALIGN_UP ((uintptr_t) (base), (size)))
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+/* Ignore the value of an expression when a cast to void does not
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+ suffice (in particular, for a call to a function declared with
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+ attribute warn_unused_result). */
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+#define ignore_value(x) \
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+ ({ __typeof__ (x) __ignored_value = (x); (void) __ignored_value; })
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+
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#endif /* _LIBC_INTERNAL */
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diff --git a/nscd/connections.c b/nscd/connections.c
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index 53813cf58876eae7..54b70e88d894523a 100644
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--- a/nscd/connections.c
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+++ b/nscd/connections.c
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@@ -1486,7 +1486,7 @@ cannot change to old UID: %s; disabling paranoia mode"),
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cannot change to old GID: %s; disabling paranoia mode"),
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strerror (errno));
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- setuid (server_uid);
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+ ignore_value (setuid (server_uid));
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paranoia = 0;
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return;
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}
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@@ -1501,8 +1501,8 @@ cannot change to old working directory: %s; disabling paranoia mode"),
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if (server_user != NULL)
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{
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- setuid (server_uid);
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- setgid (server_gid);
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+ ignore_value (setuid (server_uid));
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+ ignore_value (setgid (server_gid));
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}
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paranoia = 0;
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return;
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@@ -1546,8 +1546,8 @@ cannot change to old working directory: %s; disabling paranoia mode"),
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if (server_user != NULL)
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{
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- setuid (server_uid);
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- setgid (server_gid);
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+ ignore_value (setuid (server_uid));
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+ ignore_value (setgid (server_gid));
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}
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if (chdir ("/") != 0)
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dbg_log (_("cannot change current working directory to \"/\": %s"),
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