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