Blame src/functional/popen.c

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