2 * Check decoding of preadv2 and pwritev2 syscalls.
4 * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
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31 #include <sys/syscall.h>
33 #if defined __NR_preadv2 && defined __NR_pwritev2
42 pr(const int fd, const struct iovec *const vec,
43 const unsigned long vlen, const unsigned long pos)
45 return syscall(__NR_preadv2, fd, vec, vlen, pos, 0L, 0L);
49 pw(const int fd, const struct iovec *const vec,
50 const unsigned long vlen, const unsigned long pos)
52 return syscall(__NR_pwritev2, fd, vec, vlen, pos, 0L, 0L);
58 static char tmp[] = "preadv2-pwritev2-tmpfile";
59 if (open(tmp, O_CREAT|O_RDONLY|O_TRUNC, 0600) != 0)
60 perror_msg_and_fail("creat: %s", tmp);
61 if (open(tmp, O_WRONLY) != 1)
62 perror_msg_and_fail("open: %s", tmp);
64 perror_msg_and_fail("unlink: %s", tmp);
66 static const char w0_c[] = "012";
67 const char *w0_d = hexdump_strdup(w0_c);
68 void *w0 = tail_memdup(w0_c, LENGTH_OF(w0_c));
70 static const char w1_c[] = "34567";
71 const char *w1_d = hexdump_strdup(w1_c);
72 void *w1 = tail_memdup(w1_c, LENGTH_OF(w1_c));
74 static const char w2_c[] = "89abcde";
75 const char *w2_d = hexdump_strdup(w2_c);
76 void *w2 = tail_memdup(w2_c, LENGTH_OF(w2_c));
80 static const char r0_c[] = "01234567";
81 const char *r0_d = hexdump_strdup(r0_c);
82 static const char r1_c[] = "89abcde";
83 const char *r1_d = hexdump_strdup(r1_c);
85 const struct iovec w_iov_[] = {
88 .iov_len = LENGTH_OF(w0_c)
91 .iov_len = LENGTH_OF(w1_c)
94 .iov_len = LENGTH_OF(w2_c)
97 const struct iovec *w_iov = tail_memdup(w_iov_, sizeof(w_iov_));
99 rc = pw(1, w_iov, 0, 0);
101 perror_msg_and_fail("pwritev2: expected 0, returned %ld", rc);
102 tprintf("pwritev2(1, [], 0, 0, 0) = 0\n");
104 rc = pw(1, w_iov + ARRAY_SIZE(w_iov_) - 1, 2, 0);
105 tprintf("pwritev2(1, [{\"%s\", %u}, %p], 2, 0, 0) = %ld %s (%m)\n",
106 w2_c, LENGTH_OF(w2_c), w_iov + ARRAY_SIZE(w_iov_),
109 const unsigned int w_len =
110 LENGTH_OF(w0_c) + LENGTH_OF(w1_c) + LENGTH_OF(w2_c);
112 rc = pw(1, w_iov, ARRAY_SIZE(w_iov_), 0);
113 if (rc != (int) w_len)
114 perror_msg_and_fail("pwritev2: expected %u, returned %ld",
117 tprintf("pwritev2(1, [{\"%s\", %u}, {\"%s\", %u}"
118 ", {\"%s\", %u}], %u, 0, 0) = %u\n"
119 " * %u bytes in buffer 0\n"
120 " | 00000 %-49s %-16s |\n"
121 " * %u bytes in buffer 1\n"
122 " | 00000 %-49s %-16s |\n"
123 " * %u bytes in buffer 2\n"
124 " | 00000 %-49s %-16s |\n",
125 w0_c, LENGTH_OF(w0_c), w1_c, LENGTH_OF(w1_c),
126 w2_c, LENGTH_OF(w2_c), ARRAY_SIZE(w_iov_), w_len,
127 LENGTH_OF(w0_c), w0_d, w0_c,
128 LENGTH_OF(w1_c), w1_d, w1_c, LENGTH_OF(w2_c), w2_d, w2_c);
130 const unsigned int r_len = (w_len + 1) / 2;
131 void *r0 = tail_alloc(r_len);
132 const struct iovec r0_iov_[] = {
138 const struct iovec *r_iov = tail_memdup(r0_iov_, sizeof(r0_iov_));
140 rc = pr(0, r_iov, ARRAY_SIZE(r0_iov_), 0);
141 if (rc != (int) r_len)
142 perror_msg_and_fail("preadv2: expected %u, returned %ld",
144 tprintf("preadv2(0, [{\"%s\", %u}], %u, 0, 0) = %u\n"
145 " * %u bytes in buffer 0\n"
146 " | 00000 %-49s %-16s |\n",
147 r0_c, r_len, ARRAY_SIZE(r0_iov_), r_len, r_len, r0_d, r0_c);
149 void *r1 = tail_alloc(r_len);
150 void *r2 = tail_alloc(w_len);
151 const struct iovec r1_iov_[] = {
161 r_iov = tail_memdup(r1_iov_, sizeof(r1_iov_));
163 rc = pr(0, r_iov, ARRAY_SIZE(r1_iov_), r_len);
164 if (rc != (int) w_len - r_len)
165 perror_msg_and_fail("preadv2: expected %d, returned %ld",
166 (int) w_len - r_len, rc);
167 tprintf("preadv2(0, [{\"%s\", %u}, {\"\", %u}], %u, %u, 0) = %u\n"
168 " * %u bytes in buffer 0\n"
169 " | 00000 %-49s %-16s |\n",
170 r1_c, r_len, w_len, ARRAY_SIZE(r1_iov_),
171 r_len, w_len - r_len,
172 w_len - r_len, r1_d, r1_c);
179 const unsigned long vlen = (unsigned long) 0xfac1fed2dad3bef4;
180 const unsigned long long pos = 0xfac5fed6dad7bef8;
181 const unsigned long pos_l = (unsigned long) pos;
182 const unsigned long pos_h = (sizeof(long) == sizeof(long long)) ?
183 (unsigned long) 0xbadc0deddeadbeef : 0xfac5fed6UL;
188 syscall(__NR_preadv2, -1, NULL, vlen, pos_l, pos_h, 1);
191 tprintf("preadv2(-1, NULL, %lu, %lld, RWF_HIPRI) = -1 %s (%m)\n",
192 vlen, pos, errno2name());
194 syscall(__NR_pwritev2, -1, NULL, vlen, pos_l, pos_h, 1);
197 tprintf("pwritev2(-1, NULL, %lu, %lld, RWF_HIPRI) = -1 %s (%m)\n",
198 vlen, pos, errno2name());
203 tprintf("%s\n", "+++ exited with 0 +++");
209 SKIP_MAIN_UNDEFINED("__NR_preadv2 && __NR_pwritev2")