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-rw-r--r--include/dlt/dlt_common.h8
-rw-r--r--src/shared/dlt_common.c55
2 files changed, 63 insertions, 0 deletions
diff --git a/include/dlt/dlt_common.h b/include/dlt/dlt_common.h
index 71b9c10..aa10796 100644
--- a/include/dlt/dlt_common.h
+++ b/include/dlt/dlt_common.h
@@ -1618,6 +1618,14 @@ void dlt_getloginfo_conv_ascii_to_id(char *rp, int *rp_count, char *wp, int len)
*/
void dlt_hex_ascii_to_binary(const char *ptr, uint8_t *binary, int *size);
+/**
+ * Helper function to execute the execvp function in a new child process.
+ * @param filename file path to store the stdout of command (NULL if not required)
+ * @param command execution command followed by arguments with NULL-termination
+ * @return negative value if there was an error
+ */
+int dlt_execute_command(char *filename, char *command, ...);
+
# ifdef __cplusplus
}
# endif
diff --git a/src/shared/dlt_common.c b/src/shared/dlt_common.c
index d545fe0..bc4d5e5 100644
--- a/src/shared/dlt_common.c
+++ b/src/shared/dlt_common.c
@@ -32,9 +32,11 @@
#include <limits.h> /* for NAME_MAX */
#include <inttypes.h> /* for PRI formatting macro */
#include <stdarg.h>
+#include <err.h>
#include <errno.h>
#include <sys/stat.h> /* for mkdir() */
+#include <sys/wait.h>
#include "dlt_user_shared.h"
#include "dlt_common.h"
@@ -4063,3 +4065,56 @@ DltReturnValue dlt_file_quick_parsing(DltFile *file, const char *filename,
fclose(output);
return ret;
}
+
+
+int dlt_execute_command(char *filename, char *command, ...){
+ va_list val;
+ int argc;
+ char ** args = NULL;
+ int ret = 0;
+
+ if (command == NULL)
+ return -1;
+
+ /* Determine number of variadic arguments */
+ va_start(val, command);
+ for (argc = 2; va_arg(val, char *) != NULL; argc++);
+ va_end(val);
+
+ /* Allocate args, put references to command */
+ args = (char **) malloc(argc * sizeof(char*));
+ args[0] = command;
+
+ va_start(val, command);
+ for (int i = 0; args[i] != NULL; i++)
+ args[i+1] = va_arg(val, char *);
+ va_end(val);
+
+ /* Run command in child process */
+ pid_t pid = fork();
+ if (pid == 0) { /* child process */
+
+ /* Redirect output if required */
+ if (filename != NULL) {
+ int fd = open(filename, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
+ if (fd < 0)
+ err(-1, "%s failed on open()", __func__);
+
+ if (dup2(fd, STDOUT_FILENO) == -1) {
+ close(fd);
+ err(-1, "%s failed on dup2()", __func__);
+ }
+ close(fd);
+ }
+
+ /* Run command */
+ execvp(command, (char **)args);
+ }
+ else if (pid == -1) /* error in fork */
+ ret = -1;
+ else /* parent */
+ wait(&ret);
+
+ free(args);
+ return ret;
+}