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libucontext: Add error checking 

Add error checking test_libucontext and test_libucontext_posix
to test return values of get/set/swapcontext.

Modifications are inspired by the example program source in the
linux man page of swapcontext

Signed-off-by: Volker Christian <me@vchrist.at>
master
Volker Christian 2023-08-30 22:33:48 +02:00 committed by Ariadne Conill
parent be80075e95
commit 076e69c9c1
2 changed files with 30 additions and 12 deletions
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22
test_libucontext.c
View File

@ -9,6 +9,9 @@
#include <string.h>
#include <libucontext/libucontext.h>
#define handle_error(msg) \
do { perror(msg); exit(EXIT_FAILURE); } while (0)
static libucontext_ucontext_t ctx[3];
@ -36,7 +39,8 @@ static void f1 (int a, int b, int c, int d, int e, int f, int g, int h, int i, i
printf("looks like all arguments are passed correctly\n");
printf("swap back to f2\n");
libucontext_swapcontext(&ctx[1], &ctx[2]);
if (libucontext_swapcontext(&ctx[1], &ctx[2]) != 0)
handle_error("libucontext_swapcontext");
printf("finish f1\n");
}
@ -44,7 +48,8 @@ static void f1 (int a, int b, int c, int d, int e, int f, int g, int h, int i, i
static void f2 (void) {
printf("start f2\n");
printf("swap to f1\n");
libucontext_swapcontext(&ctx[2], &ctx[1]);
if (libucontext_swapcontext(&ctx[2], &ctx[1]) != 0)
handle_error("libucontext_swapcontext");
printf("finish f2, should swap to f1\n");
}
@ -63,7 +68,8 @@ int main (int argc, const char *argv[]) {
printf("setting up context 1\n");
libucontext_getcontext(&ctx[1]);
if (libucontext_getcontext(&ctx[1]) != 0)
handle_error("libucontext_getcontext");
ctx[1].uc_stack.ss_sp = st1;
ctx[1].uc_stack.ss_size = sizeof st1;
ctx[1].uc_link = &ctx[0];
@ -83,16 +89,20 @@ int main (int argc, const char *argv[]) {
printf("doing initial swapcontext\n");
libucontext_swapcontext(&ctx[0], &ctx[2]);
if (libucontext_swapcontext(&ctx[0], &ctx[2]) != 0)
handle_error("libucontext_swapcontext");
printf("returned from initial swapcontext\n");
/* test ability to use getcontext/setcontext without makecontext */
libucontext_getcontext(&ctx[1]);
if (libucontext_getcontext(&ctx[1]) != 0)
handle_error("libucontext_getcontext");
printf("done = %d\n", done);
if (done++ == 0) libucontext_setcontext(&ctx[1]);
if (done++ == 0)
if (libucontext_setcontext(&ctx[1]) != 0)
handle_error("libucontext_setcontext");
if (done != 2) {
fprintf(stderr, "wrong value for done. got %d, expected 2\n", done);
abort();

20
test_libucontext_posix.c
View File

@ -9,6 +9,9 @@
#include <string.h>
#include <ucontext.h>
#define handle_error(msg) \
do { perror(msg); exit(EXIT_FAILURE); } while (0)
static ucontext_t ctx[3];
@ -36,7 +39,8 @@ static void f1 (int a, int b, int c, int d, int e, int f, int g, int h, int i, i
printf("looks like all arguments are passed correctly\n");
printf("swap back to f2\n");
swapcontext(&ctx[1], &ctx[2]);
if (swapcontext(&ctx[1], &ctx[2]) != 0)
handle_error("swapcontext");
printf("finish f1\n");
}
@ -44,7 +48,8 @@ static void f1 (int a, int b, int c, int d, int e, int f, int g, int h, int i, i
static void f2 (void) {
printf("start f2\n");
printf("swap to f1\n");
swapcontext(&ctx[2], &ctx[1]);
if (swapcontext(&ctx[2], &ctx[1]) != 0)
handle_error("swapcontext");
printf("finish f2, should swap to f1\n");
}
@ -83,16 +88,19 @@ int main (int argc, const char *argv[]) {
printf("doing initial swapcontext\n");
swapcontext(&ctx[0], &ctx[2]);
if (swapcontext(&ctx[0], &ctx[2]) != 0)
handle_error("swapcontext");
printf("returned from initial swapcontext\n");
/* test ability to use getcontext/setcontext without makecontext */
getcontext(&ctx[1]);
if (getcontext(&ctx[1]) != 0)
handle_error("getcontext");
printf("done = %d\n", done);
if (done++ == 0) setcontext(&ctx[1]);
if (done++ == 0)
if (setcontext(&ctx[1]) != 0)
handle_error("setcontext");
if (done != 2) {
fprintf(stderr, "wrong value for done. got %d, expected 2\n", done);
abort();