app/test/process.h

   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_ */