2 * Check decoding of SO_LINGER socket option.
4 * Copyright (c) 2017 Dmitry V. Levin <ldv@altlinux.org>
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8 * modification, are permitted provided that the following conditions
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33 #include <sys/socket.h>
36 static const char *errstr;
39 get_linger(int fd, void *val, socklen_t *len)
41 int rc = getsockopt(fd, SOL_SOCKET, SO_LINGER, val, len);
42 errstr = sprintrc(rc);
47 set_linger(int fd, void *val, socklen_t len)
49 int rc = setsockopt(fd, SOL_SOCKET, SO_LINGER, val, len);
50 errstr = sprintrc(rc);
57 TAIL_ALLOC_OBJECT_CONST_PTR(struct linger, linger);
58 TAIL_ALLOC_OBJECT_CONST_PTR(socklen_t, len);
59 int fd = socket(AF_UNIX, SOCK_STREAM, 0);
61 perror_msg_and_skip("socket AF_UNIX SOCK_STREAM");
63 /* classic getsockopt */
64 *len = sizeof(*linger);
65 get_linger(fd, linger, len);
66 printf("getsockopt(%d, SOL_SOCKET, SO_LINGER, {l_onoff=%d, l_linger=%d}"
68 fd, linger->l_onoff, linger->l_linger, *len, errstr);
70 /* classic setsockopt */
71 linger->l_onoff = -15;
72 linger->l_linger = -42;
73 set_linger(fd, linger, sizeof(*linger));
74 printf("setsockopt(%d, SOL_SOCKET, SO_LINGER, {l_onoff=%d, l_linger=%d}"
76 fd, linger->l_onoff, linger->l_linger,
77 (unsigned int) sizeof(*linger), errstr);
79 /* setsockopt with optlen larger than necessary */
80 set_linger(fd, linger, sizeof(*linger) + 1);
81 printf("setsockopt(%d, SOL_SOCKET, SO_LINGER, {l_onoff=%d, l_linger=%d}"
83 fd, linger->l_onoff, linger->l_linger,
84 (unsigned int) sizeof(*linger) + 1, errstr);
86 /* setsockopt with optlen < 0 - EINVAL */
87 set_linger(fd, linger, -1U);
88 printf("setsockopt(%d, SOL_SOCKET, SO_LINGER, %p, -1) = %s\n",
91 /* setsockopt with optlen smaller than necessary - EINVAL */
92 set_linger(fd, linger, sizeof(linger->l_onoff));
93 printf("setsockopt(%d, SOL_SOCKET, SO_LINGER, %p, %d) = %s\n",
94 fd, linger, (unsigned int) sizeof(linger->l_onoff), errstr);
96 /* setsockopt optval EFAULT */
97 set_linger(fd, &linger->l_linger, sizeof(*linger));
98 printf("setsockopt(%d, SOL_SOCKET, SO_LINGER, %p, %d) = %s\n",
99 fd, &linger->l_linger, (unsigned int) sizeof(*linger), errstr);
101 /* getsockopt with optlen larger than necessary - shortened */
102 *len = sizeof(*linger) + 1;
103 get_linger(fd, linger, len);
104 printf("getsockopt(%d, SOL_SOCKET, SO_LINGER, {l_onoff=%d, l_linger=%d}"
105 ", [%u->%d]) = %s\n",
106 fd, linger->l_onoff, linger->l_linger,
107 (unsigned int) sizeof(*linger) + 1, *len, errstr);
109 /* getsockopt with optlen larger than usual - truncated to l_onoff */
110 *len = sizeof(linger->l_onoff);
111 get_linger(fd, linger, len);
112 printf("getsockopt(%d, SOL_SOCKET, SO_LINGER, {l_onoff=%d}"
114 fd, linger->l_onoff, *len, errstr);
116 /* getsockopt with optlen larger than usual - truncated to raw */
117 *len = sizeof(*linger) - 1;
118 get_linger(fd, linger, len);
119 printf("getsockopt(%d, SOL_SOCKET, SO_LINGER, ", fd);
120 print_quoted_hex(linger, *len);
121 printf(", [%d]) = %s\n", *len, errstr);
123 /* getsockopt optval EFAULT */
124 *len = sizeof(*linger);
125 get_linger(fd, &linger->l_linger, len);
126 printf("getsockopt(%d, SOL_SOCKET, SO_LINGER, %p, [%d]) = %s\n",
127 fd, &linger->l_linger, *len, errstr);
129 /* getsockopt optlen EFAULT */
130 get_linger(fd, linger, len + 1);
131 printf("getsockopt(%d, SOL_SOCKET, SO_LINGER, %p, %p) = %s\n",
132 fd, linger, len + 1, errstr);
134 puts("+++ exited with 0 +++");