commit af31ce2cbfcaecc2a6f342532ede5e293a34f7f7
author Khem Raj <raj.khem@gmail.com> Tue May 04 10:32:08 2021 -0700
committer Khem Raj <raj.khem@gmail.com> Tue May 04 19:05:52 2021 -0700
tree 4ab8b4eb690ba58968ef3f1dae3f913d7efa3075
parent e9e587b13e87025dfccd0565e2ade0d31d643526

examples/ucontext-cp.c: Do not use SIGSTKSZ

glibc 2.34 has removed SIGSTKSZ therefore we replace it

Signed-off-by: Khem Raj <raj.khem@gmail.com>

examples/ucontext-cp.c

diff --git a/examples/ucontext-cp.c b/examples/ucontext-cp.c
index ea0c934..b1369e2 100644
--- a/examples/ucontext-cp.c
+++ b/examples/ucontext-cp.c
@@ -3,6 +3,7 @@
  * gcc -Wall -O2 -D_GNU_SOURCE -o ucontext-cp ucontext-cp.c -luring
  */
 #define _POSIX_C_SOURCE 199309L
+#include <stddef.h>
 #include <stdio.h>
 #include <fcntl.h>
 #include <string.h>
@@ -22,9 +23,7 @@
 #define QD	64
 #define BS	1024
 
-#ifndef SIGSTKSZ
-#define SIGSTKSZ 8192
-#endif
+size_t sigstksz = (8 * 1024 + sizeof (max_align_t) - 1) / sizeof (max_align_t);
 
 typedef struct {
 	struct io_uring *ring;
@@ -115,13 +114,13 @@
 		perror("getcontext");
 		return -1;
 	}
-	pctx->stack_buf = malloc(SIGSTKSZ);
+	pctx->stack_buf = malloc(sigstksz);
 	if (!pctx->stack_buf) {
 		perror("malloc");
 		return -1;
 	}
 	pctx->ctx_fnew.uc_stack.ss_sp = pctx->stack_buf;
-	pctx->ctx_fnew.uc_stack.ss_size = SIGSTKSZ;
+	pctx->ctx_fnew.uc_stack.ss_size = sigstksz;
 	pctx->ctx_fnew.uc_link = &pctx->ctx_main;
 
 	return 0;