--- /dev/null
+/*
+ * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "tests.h"
+#include <limits.h>
+#include <unistd.h>
+#include <sys/resource.h>
+
+static void
+move_fd(int *from, int *to)
+{
+ for (; *to > *from; --*to) {
+ if (dup2(*from, *to) != *to)
+ continue;
+ close(*from);
+ *from = *to;
+ break;
+ }
+}
+
+void
+pipe_maxfd(int pipefd[2])
+{
+ struct rlimit rlim;
+ if (getrlimit(RLIMIT_NOFILE, &rlim))
+ perror_msg_and_fail("getrlimit");
+ if (rlim.rlim_cur < rlim.rlim_max) {
+ struct rlimit rlim_new;
+ rlim_new.rlim_cur = rlim_new.rlim_max = rlim.rlim_max;
+ if (!setrlimit(RLIMIT_NOFILE, &rlim_new))
+ rlim.rlim_cur = rlim.rlim_max;
+ }
+
+ if (pipe(pipefd))
+ perror_msg_and_fail("pipe");
+
+ int max_fd = (rlim.rlim_cur > 0 && rlim.rlim_cur < INT_MAX)
+ ? rlim.rlim_cur - 1 : INT_MAX;
+
+ move_fd(&pipefd[1], &max_fd);
+ --max_fd;
+ move_fd(&pipefd[0], &max_fd);
+}
--- /dev/null
+/*
+ * Print the maximum descriptor number available.
+ *
+ * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "tests.h"
+#include <stdio.h>
+#include <sys/resource.h>
+
+int
+main(void)
+{
+ int fds[2];
+ pipe_maxfd(fds);
+ printf("%d\n", fds[1]);
+ return 0;
+}
tprintf("%s", "");
int fds[2];
- if (pipe(fds))
- perror_msg_and_fail("pipe");
- assert(0 == fds[0]);
- assert(1 == fds[1]);
+ pipe_maxfd(fds);
static const char w0_c[] = "012";
const char *w0_d = hexdump_strdup(w0_c);
void *w2 = tail_memdup(w2_c, LENGTH_OF(w2_c));
long rc;
- rc = writev(1, efault, 42);
- tprintf("writev(1, %p, 42) = %ld %s (%m)\n",
- efault, rc, errno2name());
+ rc = writev(fds[1], efault, 42);
+ tprintf("writev(%d, %p, 42) = %ld %s (%m)\n",
+ fds[1], efault, rc, errno2name());
- rc = readv(0, efault, 42);
- tprintf("readv(0, %p, 42) = %ld %s (%m)\n",
- efault, rc, errno2name());
+ rc = readv(fds[0], efault, 42);
+ tprintf("readv(%d, %p, 42) = %ld %s (%m)\n",
+ fds[0], efault, rc, errno2name());
static const char r0_c[] = "01234567";
const char *r0_d = hexdump_strdup(r0_c);
};
const struct iovec *w_iov = tail_memdup(w_iov_, sizeof(w_iov_));
- tprintf("writev(1, [], 0) = %ld\n",
- (long) writev(1, w_iov, 0));
+ tprintf("writev(%d, [], 0) = %ld\n",
+ fds[1], (long) writev(fds[1], w_iov, 0));
- rc = writev(1, w_iov + ARRAY_SIZE(w_iov_) - 1, 2);
- tprintf("writev(1, [{iov_base=\"%s\", iov_len=%u}, %p], 2)"
+ rc = writev(fds[1], w_iov + ARRAY_SIZE(w_iov_) - 1, 2);
+ tprintf("writev(%d, [{iov_base=\"%s\", iov_len=%u}, %p], 2)"
" = %ld %s (%m)\n",
- w2_c, LENGTH_OF(w2_c), w_iov + ARRAY_SIZE(w_iov_),
+ fds[1], w2_c, LENGTH_OF(w2_c), w_iov + ARRAY_SIZE(w_iov_),
rc, errno2name());
const unsigned int w_len =
LENGTH_OF(w0_c) + LENGTH_OF(w1_c) + LENGTH_OF(w2_c);
- assert(writev(1, w_iov, ARRAY_SIZE(w_iov_)) == (int) w_len);
- close(1);
- tprintf("writev(1, [{iov_base=\"%s\", iov_len=%u}"
+ assert(writev(fds[1], w_iov, ARRAY_SIZE(w_iov_)) == (int) w_len);
+ close(fds[1]);
+ tprintf("writev(%d, [{iov_base=\"%s\", iov_len=%u}"
", {iov_base=\"%s\", iov_len=%u}"
", {iov_base=\"%s\", iov_len=%u}], %u) = %u\n"
" * %u bytes in buffer 0\n"
" | 00000 %-49s %-16s |\n"
" * %u bytes in buffer 2\n"
" | 00000 %-49s %-16s |\n",
- w0_c, LENGTH_OF(w0_c), w1_c, LENGTH_OF(w1_c),
+ fds[1], w0_c, LENGTH_OF(w0_c), w1_c, LENGTH_OF(w1_c),
w2_c, LENGTH_OF(w2_c), ARRAY_SIZE(w_iov_), w_len,
LENGTH_OF(w0_c), w0_d, w0_c,
LENGTH_OF(w1_c), w1_d, w1_c, LENGTH_OF(w2_c), w2_d, w2_c);
};
const struct iovec *r_iov = tail_memdup(r0_iov_, sizeof(r0_iov_));
- assert(readv(0, r_iov, ARRAY_SIZE(r0_iov_)) == (int) r_len);
- tprintf("readv(0, [{iov_base=\"%s\", iov_len=%u}], %u) = %u\n"
+ assert(readv(fds[0], r_iov, ARRAY_SIZE(r0_iov_)) == (int) r_len);
+ tprintf("readv(%d, [{iov_base=\"%s\", iov_len=%u}], %u) = %u\n"
" * %u bytes in buffer 0\n"
" | 00000 %-49s %-16s |\n",
+ fds[0],
r0_c, r_len, ARRAY_SIZE(r0_iov_), r_len, r_len, r0_d, r0_c);
void *r1 = tail_alloc(r_len);
};
r_iov = tail_memdup(r1_iov_, sizeof(r1_iov_));
- assert(readv(0, r_iov, ARRAY_SIZE(r1_iov_)) == (int) w_len - (int) r_len);
- tprintf("readv(0, [{iov_base=\"%s\", iov_len=%u}"
+ assert(readv(fds[0], r_iov, ARRAY_SIZE(r1_iov_)) == (int) w_len - (int) r_len);
+ tprintf("readv(%d, [{iov_base=\"%s\", iov_len=%u}"
", {iov_base=\"\", iov_len=%u}], %u) = %u\n"
" * %u bytes in buffer 0\n"
" | 00000 %-49s %-16s |\n",
- r1_c, r_len, w_len, ARRAY_SIZE(r1_iov_), w_len - r_len,
+ fds[0], r1_c, r_len, w_len, ARRAY_SIZE(r1_iov_), w_len - r_len,
w_len - r_len, r1_d, r1_c);
- close(0);
+ close(fds[0]);
tprintf("+++ exited with 0 +++\n");
return 0;
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