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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 | // SPDX-License-Identifier: GPL-2.0 #define _GNU_SOURCE #include <errno.h> #include <fcntl.h> #include <asm/unistd.h> #include <linux/time_types.h> #include <unistd.h> #include <assert.h> #include <signal.h> #include <pthread.h> #include <sys/epoll.h> #include <sys/eventfd.h> #include "../../kselftest_harness.h" struct error { int code; char msg[512]; }; static int error_set(struct error *err, int code, const char *fmt, ...) { va_list args; int r; if (code == 0 || !err || err->code != 0) return code; err->code = code; va_start(args, fmt); r = vsnprintf(err->msg, sizeof(err->msg), fmt, args); assert((size_t)r < sizeof(err->msg)); va_end(args); return code; } static inline int sys_eventfd2(unsigned int count, int flags) { return syscall(__NR_eventfd2, count, flags); } TEST(eventfd01) { int fd, flags; fd = sys_eventfd2(0, 0); ASSERT_GE(fd, 0); flags = fcntl(fd, F_GETFL); // since the kernel automatically added O_RDWR. EXPECT_EQ(flags, O_RDWR); close(fd); } TEST(eventfd02) { int fd, flags; fd = sys_eventfd2(0, EFD_CLOEXEC); ASSERT_GE(fd, 0); flags = fcntl(fd, F_GETFD); ASSERT_GT(flags, -1); EXPECT_EQ(flags, FD_CLOEXEC); close(fd); } TEST(eventfd03) { int fd, flags; fd = sys_eventfd2(0, EFD_NONBLOCK); ASSERT_GE(fd, 0); flags = fcntl(fd, F_GETFL); ASSERT_GT(flags, -1); EXPECT_EQ(flags & EFD_NONBLOCK, EFD_NONBLOCK); EXPECT_EQ(flags & O_RDWR, O_RDWR); close(fd); } TEST(eventfd04) { int fd, flags; fd = sys_eventfd2(0, EFD_CLOEXEC|EFD_NONBLOCK); ASSERT_GE(fd, 0); flags = fcntl(fd, F_GETFL); ASSERT_GT(flags, -1); EXPECT_EQ(flags & EFD_NONBLOCK, EFD_NONBLOCK); EXPECT_EQ(flags & O_RDWR, O_RDWR); flags = fcntl(fd, F_GETFD); ASSERT_GT(flags, -1); EXPECT_EQ(flags, FD_CLOEXEC); close(fd); } static inline void trim_newline(char *str) { char *pos = strrchr(str, '\n'); if (pos) *pos = '\0'; } static int verify_fdinfo(int fd, struct error *err, const char *prefix, size_t prefix_len, const char *expect, ...) { char buffer[512] = {0, }; char path[512] = {0, }; va_list args; FILE *f; char *line = NULL; size_t n = 0; int found = 0; int r; va_start(args, expect); r = vsnprintf(buffer, sizeof(buffer), expect, args); assert((size_t)r < sizeof(buffer)); va_end(args); snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd); f = fopen(path, "re"); if (!f) return error_set(err, -1, "fdinfo open failed for %d", fd); while (getline(&line, &n, f) != -1) { char *val; if (strncmp(line, prefix, prefix_len)) continue; found = 1; val = line + prefix_len; r = strcmp(val, buffer); if (r != 0) { trim_newline(line); trim_newline(buffer); error_set(err, -1, "%s '%s' != '%s'", prefix, val, buffer); } break; } free(line); fclose(f); if (found == 0) return error_set(err, -1, "%s not found for fd %d", prefix, fd); return 0; } TEST(eventfd05) { struct error err = {0}; int fd, ret; fd = sys_eventfd2(0, EFD_SEMAPHORE); ASSERT_GE(fd, 0); ret = fcntl(fd, F_GETFL); ASSERT_GT(ret, -1); EXPECT_EQ(ret & O_RDWR, O_RDWR); // The semaphore could only be obtained from fdinfo. ret = verify_fdinfo(fd, &err, "eventfd-semaphore: ", 19, "1\n"); if (ret != 0) ksft_print_msg("eventfd-semaphore check failed, msg: %s\n", err.msg); EXPECT_EQ(ret, 0); close(fd); } TEST_HARNESS_MAIN |