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 #endif 52 #endif 53 54 pid_t pid = fork(); 55 if (pid < 0) 56 return -1; 57 else if (pid == 0) { 58 /* make a copy of the arguments to be passed to exec */ 59 for (i = 0; i < numargs; i++) 60 argv_cpy[i] = strdup(argv[i]); 61 argv_cpy[i] = NULL; 62 num = numargs; 63 64 #ifdef RTE_EXEC_ENV_LINUX 65 { 66 const char *procdir = "/proc/" self "/fd/"; 67 struct dirent *dirent; 68 char *endptr; 69 int fd, fdir; 70 DIR *dir; 71 72 /* close all open file descriptors, check /proc/self/fd 73 * to only call close on open fds. Exclude fds 0, 1 and 74 * 2 75 */ 76 dir = opendir(procdir); 77 if (dir == NULL) { 78 rte_panic("Error opening %s: %s\n", procdir, 79 strerror(errno)); 80 } 81 82 fdir = dirfd(dir); 83 if (fdir < 0) { 84 status = errno; 85 closedir(dir); 86 rte_panic("Error %d obtaining fd for dir %s: %s\n", 87 fdir, procdir, 88 strerror(status)); 89 } 90 91 while ((dirent = readdir(dir)) != NULL) { 92 errno = 0; 93 fd = strtol(dirent->d_name, &endptr, 10); 94 if (errno != 0 || endptr[0] != '\0') { 95 printf("Error converting name fd %d %s:\n", 96 fd, dirent->d_name); 97 continue; 98 } 99 100 if (fd == fdir || fd <= 2) 101 continue; 102 103 close(fd); 104 } 105 closedir(dir); 106 } 107 #endif 108 printf("Running binary with argv[]:"); 109 for (i = 0; i < num; i++) 110 printf("'%s' ", argv_cpy[i]); 111 printf("\n"); 112 113 /* set the environment variable */ 114 if (setenv(RECURSIVE_ENV_VAR, env_value, 1) != 0) 115 rte_panic("Cannot export environment variable\n"); 116 117 strlcpy(path, "/proc/" self "/" exe, sizeof(path)); 118 if (execv(path, argv_cpy) < 0) { 119 if (errno == ENOENT) { 120 printf("Could not find '%s', is procfs mounted?\n", 121 path); 122 } 123 rte_panic("Cannot exec: %s\n", strerror(errno)); 124 } 125 } 126 /* parent process does a wait */ 127 #ifdef RTE_LIB_PDUMP 128 #ifdef RTE_NET_RING 129 if ((strcmp(env_value, "run_pdump_server_tests") == 0)) 130 pthread_create(&thread, NULL, &send_pkts, NULL); 131 #endif 132 #endif 133 134 while (wait(&status) != pid) 135 ; 136 #ifdef RTE_LIB_PDUMP 137 #ifdef RTE_NET_RING 138 if ((strcmp(env_value, "run_pdump_server_tests") == 0)) { 139 flag_for_send_pkts = 0; 140 pthread_join(thread, NULL); 141 } 142 #endif 143 #endif 144 return status; 145 } 146 147 /* FreeBSD doesn't support file prefixes, so force compile failures for any 148 * tests attempting to use this function on FreeBSD. 149 */ 150 #ifdef RTE_EXEC_ENV_LINUX 151 static char * 152 get_current_prefix(char *prefix, int size) 153 { 154 char path[PATH_MAX] = {0}; 155 char buf[PATH_MAX] = {0}; 156 157 /* get file for config (fd is always 3) */ 158 snprintf(path, sizeof(path), "/proc/self/fd/%d", 3); 159 160 /* return NULL on error */ 161 if (readlink(path, buf, sizeof(buf)) == -1) 162 return NULL; 163 164 /* get the prefix */ 165 snprintf(prefix, size, "%s", basename(dirname(buf))); 166 167 return prefix; 168 } 169 #endif 170 171 #endif /* _PROCESS_H_ */ 172