1 /* SPDX-License-Identifier: BSD-3-Clause 2 * Copyright(c) 2010-2014 Intel Corporation 3 */ 4 5 #ifndef _PROCESS_H_ 6 #define _PROCESS_H_ 7 8 #include <errno.h> /* errno */ 9 #include <limits.h> /* PATH_MAX */ 10 #ifndef RTE_EXEC_ENV_WINDOWS 11 #include <libgen.h> /* basename et al */ 12 #include <sys/wait.h> 13 #endif 14 #include <stdlib.h> /* NULL */ 15 #include <string.h> /* strerror */ 16 #include <unistd.h> /* readlink */ 17 #include <dirent.h> 18 19 #include <rte_string_fns.h> /* strlcpy */ 20 21 #ifdef RTE_EXEC_ENV_FREEBSD 22 #define self "curproc" 23 #define exe "file" 24 #else 25 #define self "self" 26 #define exe "exe" 27 #endif 28 29 #ifdef RTE_LIB_PDUMP 30 #ifdef RTE_NET_RING 31 #include <rte_thread.h> 32 extern uint32_t send_pkts(void *empty); 33 extern uint16_t flag_for_send_pkts; 34 #endif 35 #endif 36 37 /* 38 * launches a second copy of the test process using the given argv parameters, 39 * which should include argv[0] as the process name. To identify in the 40 * subprocess the source of the call, the env_value parameter is set in the 41 * environment as $RTE_TEST 42 */ 43 static inline int 44 process_dup(const char *const argv[], int numargs, const char *env_value) 45 { 46 int num; 47 char *argv_cpy[numargs + 1]; 48 int i, status; 49 char path[32]; 50 #ifdef RTE_LIB_PDUMP 51 #ifdef RTE_NET_RING 52 rte_thread_t thread; 53 int rc; 54 #endif 55 #endif 56 57 pid_t pid = fork(); 58 if (pid < 0) 59 return -1; 60 else if (pid == 0) { 61 /* make a copy of the arguments to be passed to exec */ 62 for (i = 0; i < numargs; i++) { 63 argv_cpy[i] = strdup(argv[i]); 64 if (argv_cpy[i] == NULL) 65 rte_panic("Error dup args\n"); 66 } 67 argv_cpy[i] = NULL; 68 num = numargs; 69 70 #ifdef RTE_EXEC_ENV_LINUX 71 { 72 const char *procdir = "/proc/" self "/fd/"; 73 struct dirent *dirent; 74 char *endptr; 75 int fd, fdir; 76 DIR *dir; 77 78 /* close all open file descriptors, check /proc/self/fd 79 * to only call close on open fds. Exclude fds 0, 1 and 80 * 2 81 */ 82 dir = opendir(procdir); 83 if (dir == NULL) { 84 rte_panic("Error opening %s: %s\n", procdir, 85 strerror(errno)); 86 } 87 88 fdir = dirfd(dir); 89 if (fdir < 0) { 90 status = errno; 91 closedir(dir); 92 rte_panic("Error %d obtaining fd for dir %s: %s\n", 93 fdir, procdir, 94 strerror(status)); 95 } 96 97 while ((dirent = readdir(dir)) != NULL) { 98 99 if (strcmp(dirent->d_name, ".") == 0 || 100 strcmp(dirent->d_name, "..") == 0) 101 continue; 102 103 errno = 0; 104 fd = strtol(dirent->d_name, &endptr, 10); 105 if (errno != 0 || endptr[0] != '\0') { 106 printf("Error converting name fd %d %s:\n", 107 fd, dirent->d_name); 108 continue; 109 } 110 111 if (fd == fdir || fd <= 2) 112 continue; 113 114 close(fd); 115 } 116 closedir(dir); 117 } 118 #endif 119 printf("Running binary with argv[]:"); 120 for (i = 0; i < num; i++) 121 printf("'%s' ", argv_cpy[i]); 122 printf("\n"); 123 fflush(stdout); 124 125 /* set the environment variable */ 126 if (setenv(RECURSIVE_ENV_VAR, env_value, 1) != 0) 127 rte_panic("Cannot export environment variable\n"); 128 129 strlcpy(path, "/proc/" self "/" exe, sizeof(path)); 130 if (execv(path, argv_cpy) < 0) { 131 if (errno == ENOENT) { 132 printf("Could not find '%s', is procfs mounted?\n", 133 path); 134 } 135 rte_panic("Cannot exec: %s\n", strerror(errno)); 136 } 137 } 138 /* parent process does a wait */ 139 #ifdef RTE_LIB_PDUMP 140 #ifdef RTE_NET_RING 141 if ((strcmp(env_value, "run_pdump_server_tests") == 0)) { 142 rc = rte_thread_create(&thread, NULL, send_pkts, NULL); 143 if (rc != 0) { 144 rte_panic("Cannot start send pkts thread: %s\n", 145 strerror(rc)); 146 } 147 } 148 #endif 149 #endif 150 151 while (wait(&status) != pid) 152 ; 153 #ifdef RTE_LIB_PDUMP 154 #ifdef RTE_NET_RING 155 if ((strcmp(env_value, "run_pdump_server_tests") == 0)) { 156 flag_for_send_pkts = 0; 157 rte_thread_join(thread, NULL); 158 } 159 #endif 160 #endif 161 return status; 162 } 163 164 /* FreeBSD doesn't support file prefixes, so force compile failures for any 165 * tests attempting to use this function on FreeBSD. 166 */ 167 #ifdef RTE_EXEC_ENV_LINUX 168 static char * 169 get_current_prefix(char *prefix, int size) 170 { 171 char path[PATH_MAX] = {0}; 172 char buf[PATH_MAX] = {0}; 173 174 /* get file for config (fd is always 3) */ 175 snprintf(path, sizeof(path), "/proc/self/fd/%d", 3); 176 177 /* return NULL on error */ 178 if (readlink(path, buf, sizeof(buf)) == -1) 179 return NULL; 180 181 /* get the prefix */ 182 snprintf(prefix, size, "%s", basename(dirname(buf))); 183 184 return prefix; 185 } 186 #endif 187 188 #endif /* _PROCESS_H_ */ 189