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 <pthread.h> 32 extern void *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 pthread_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 argv_cpy[i] = NULL; 65 num = numargs; 66 67 #ifdef RTE_EXEC_ENV_LINUX 68 { 69 const char *procdir = "/proc/" self "/fd/"; 70 struct dirent *dirent; 71 char *endptr; 72 int fd, fdir; 73 DIR *dir; 74 75 /* close all open file descriptors, check /proc/self/fd 76 * to only call close on open fds. Exclude fds 0, 1 and 77 * 2 78 */ 79 dir = opendir(procdir); 80 if (dir == NULL) { 81 rte_panic("Error opening %s: %s\n", procdir, 82 strerror(errno)); 83 } 84 85 fdir = dirfd(dir); 86 if (fdir < 0) { 87 status = errno; 88 closedir(dir); 89 rte_panic("Error %d obtaining fd for dir %s: %s\n", 90 fdir, procdir, 91 strerror(status)); 92 } 93 94 while ((dirent = readdir(dir)) != NULL) { 95 96 if (strcmp(dirent->d_name, ".") == 0 || 97 strcmp(dirent->d_name, "..") == 0) 98 continue; 99 100 errno = 0; 101 fd = strtol(dirent->d_name, &endptr, 10); 102 if (errno != 0 || endptr[0] != '\0') { 103 printf("Error converting name fd %d %s:\n", 104 fd, dirent->d_name); 105 continue; 106 } 107 108 if (fd == fdir || fd <= 2) 109 continue; 110 111 close(fd); 112 } 113 closedir(dir); 114 } 115 #endif 116 printf("Running binary with argv[]:"); 117 for (i = 0; i < num; i++) 118 printf("'%s' ", argv_cpy[i]); 119 printf("\n"); 120 fflush(stdout); 121 122 /* set the environment variable */ 123 if (setenv(RECURSIVE_ENV_VAR, env_value, 1) != 0) 124 rte_panic("Cannot export environment variable\n"); 125 126 strlcpy(path, "/proc/" self "/" exe, sizeof(path)); 127 if (execv(path, argv_cpy) < 0) { 128 if (errno == ENOENT) { 129 printf("Could not find '%s', is procfs mounted?\n", 130 path); 131 } 132 rte_panic("Cannot exec: %s\n", strerror(errno)); 133 } 134 } 135 /* parent process does a wait */ 136 #ifdef RTE_LIB_PDUMP 137 #ifdef RTE_NET_RING 138 if ((strcmp(env_value, "run_pdump_server_tests") == 0)) { 139 rc = pthread_create(&thread, NULL, &send_pkts, NULL); 140 if (rc != 0) { 141 rte_panic("Cannot start send pkts thread: %s\n", 142 strerror(rc)); 143 } 144 } 145 #endif 146 #endif 147 148 while (wait(&status) != pid) 149 ; 150 #ifdef RTE_LIB_PDUMP 151 #ifdef RTE_NET_RING 152 if ((strcmp(env_value, "run_pdump_server_tests") == 0)) { 153 flag_for_send_pkts = 0; 154 pthread_join(thread, NULL); 155 } 156 #endif 157 #endif 158 return status; 159 } 160 161 /* FreeBSD doesn't support file prefixes, so force compile failures for any 162 * tests attempting to use this function on FreeBSD. 163 */ 164 #ifdef RTE_EXEC_ENV_LINUX 165 static char * 166 get_current_prefix(char *prefix, int size) 167 { 168 char path[PATH_MAX] = {0}; 169 char buf[PATH_MAX] = {0}; 170 171 /* get file for config (fd is always 3) */ 172 snprintf(path, sizeof(path), "/proc/self/fd/%d", 3); 173 174 /* return NULL on error */ 175 if (readlink(path, buf, sizeof(buf)) == -1) 176 return NULL; 177 178 /* get the prefix */ 179 snprintf(prefix, size, "%s", basename(dirname(buf))); 180 181 return prefix; 182 } 183 #endif 184 185 #endif /* _PROCESS_H_ */ 186