From a9baddd7d07b9fe15e212985a808a79773ec72e4 Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Sat, 19 Mar 2011 22:26:06 -0400 Subject: initial check-in, taken from old libc svn repo with significant additions --- popen.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 popen.c (limited to 'popen.c') diff --git a/popen.c b/popen.c new file mode 100644 index 0000000..8a5843a --- /dev/null +++ b/popen.c @@ -0,0 +1,51 @@ +#include +#include +#include +#include +#include + +#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 test_popen(void) +{ + int i; + char foo[6]; + char cmd[64]; + int err = 0; + FILE *f; + + TEST_E(f = popen("echo hello", "r")); + if (f) { + 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")); + if (f) { + TEST_E(fputs("hello", f) >= 0); + TEST(i, pclose(f), 0, "exit status %04x != %04x"); + TEST(i, got_sig, 1, "child process did not send signal"); + } + signal(SIGUSR1, SIG_DFL); + + return err; +} -- cgit v1.2.1