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
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@ -9,6 +9,9 @@
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#include <string.h>
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#include <libucontext/libucontext.h>
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#define handle_error(msg) \
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do { perror(msg); exit(EXIT_FAILURE); } while (0)
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static libucontext_ucontext_t ctx[3];
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@ -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
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printf("looks like all arguments are passed correctly\n");
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printf("swap back to f2\n");
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libucontext_swapcontext(&ctx[1], &ctx[2]);
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if (libucontext_swapcontext(&ctx[1], &ctx[2]) != 0)
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handle_error("libucontext_swapcontext");
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printf("finish f1\n");
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}
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@ -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
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static void f2 (void) {
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printf("start f2\n");
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printf("swap to f1\n");
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libucontext_swapcontext(&ctx[2], &ctx[1]);
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if (libucontext_swapcontext(&ctx[2], &ctx[1]) != 0)
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handle_error("libucontext_swapcontext");
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printf("finish f2, should swap to f1\n");
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}
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@ -63,7 +68,8 @@ int main (int argc, const char *argv[]) {
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printf("setting up context 1\n");
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libucontext_getcontext(&ctx[1]);
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if (libucontext_getcontext(&ctx[1]) != 0)
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handle_error("libucontext_getcontext");
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ctx[1].uc_stack.ss_sp = st1;
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ctx[1].uc_stack.ss_size = sizeof st1;
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ctx[1].uc_link = &ctx[0];
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@ -83,16 +89,20 @@ int main (int argc, const char *argv[]) {
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printf("doing initial swapcontext\n");
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libucontext_swapcontext(&ctx[0], &ctx[2]);
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if (libucontext_swapcontext(&ctx[0], &ctx[2]) != 0)
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handle_error("libucontext_swapcontext");
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printf("returned from initial swapcontext\n");
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/* test ability to use getcontext/setcontext without makecontext */
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libucontext_getcontext(&ctx[1]);
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if (libucontext_getcontext(&ctx[1]) != 0)
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handle_error("libucontext_getcontext");
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printf("done = %d\n", done);
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if (done++ == 0) libucontext_setcontext(&ctx[1]);
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if (done++ == 0)
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if (libucontext_setcontext(&ctx[1]) != 0)
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handle_error("libucontext_setcontext");
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if (done != 2) {
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fprintf(stderr, "wrong value for done. got %d, expected 2\n", done);
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abort();
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@ -9,6 +9,9 @@
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#include <string.h>
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#include <ucontext.h>
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#define handle_error(msg) \
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do { perror(msg); exit(EXIT_FAILURE); } while (0)
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static ucontext_t ctx[3];
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@ -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
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printf("looks like all arguments are passed correctly\n");
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printf("swap back to f2\n");
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swapcontext(&ctx[1], &ctx[2]);
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if (swapcontext(&ctx[1], &ctx[2]) != 0)
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handle_error("swapcontext");
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printf("finish f1\n");
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}
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@ -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
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static void f2 (void) {
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printf("start f2\n");
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printf("swap to f1\n");
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swapcontext(&ctx[2], &ctx[1]);
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if (swapcontext(&ctx[2], &ctx[1]) != 0)
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handle_error("swapcontext");
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printf("finish f2, should swap to f1\n");
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}
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@ -83,16 +88,19 @@ int main (int argc, const char *argv[]) {
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printf("doing initial swapcontext\n");
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swapcontext(&ctx[0], &ctx[2]);
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if (swapcontext(&ctx[0], &ctx[2]) != 0)
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handle_error("swapcontext");
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printf("returned from initial swapcontext\n");
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/* test ability to use getcontext/setcontext without makecontext */
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getcontext(&ctx[1]);
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if (getcontext(&ctx[1]) != 0)
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handle_error("getcontext");
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printf("done = %d\n", done);
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if (done++ == 0) setcontext(&ctx[1]);
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if (done++ == 0)
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if (setcontext(&ctx[1]) != 0)
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handle_error("setcontext");
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if (done != 2) {
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fprintf(stderr, "wrong value for done. got %d, expected 2\n", done);
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abort();
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