#include <unistd.h> #include <stdio.h> #include <errno.h> #include <string.h> #include <signal.h> #define TEST(r, f, x, m) ( \ ((r) = (f)) == (x) || \ (printf(__FILE__ ":%d: %s failed (" m ")\n", __LINE__, #f, r, x), err++, 0) ) #define TEST_E(f) ( (errno = 0), (f) || \ (printf(__FILE__ ":%d: %s failed (errno = %d)\n", __LINE__, #f, errno), err++, 0) ) #define TEST_S(s, x, m) ( \ !strcmp((s),(x)) || \ (printf(__FILE__ ":%d: [%s] != [%s] (%s)\n", __LINE__, s, x, m), err++, 0) ) static sig_atomic_t got_sig; static void handler(int sig) { got_sig = 1; } int main(void) { int i; char foo[6]; char cmd[64]; int err = 0; FILE *f; TEST_E(f = popen("echo hello", "r")); TEST_E(fgets(foo, sizeof foo, f)); TEST_S(foo, "hello", "child process did not say hello"); TEST(i, pclose(f), 0, "exit status %04x != %04x"); signal(SIGUSR1, handler); snprintf(cmd, sizeof cmd, "read a ; test \"x$a\" = xhello && kill -USR1 %d", getpid()); TEST_E(f = popen(cmd, "w")); TEST_E(fputs("hello", f) >= 0); TEST(i, pclose(f), 0, "exit status %04x != %04x"); signal(SIGUSR1, SIG_DFL); TEST(i, got_sig, 1, "child process did not send signal (%i!=%i)"); return err; }