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_LIBRTE_PDUMP
  28 #ifdef RTE_LIBRTE_RING_PMD
  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_LIBRTE_PDUMP
  49 #ifdef RTE_LIBRTE_RING_PMD
  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_LIBRTE_PDUMP
 128 #ifdef RTE_LIBRTE_RING_PMD
 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_LIBRTE_PDUMP
 137 #ifdef RTE_LIBRTE_RING_PMD
 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_ */