pipecmd: add stderr fd arg.

[ccan] / ccan / pipecmd / pipecmd.h

diff --git a/ccan/pipecmd/pipecmd.h b/ccan/pipecmd/pipecmd.h
index 87e3dcf8193ddf17985f0c33d372be34928566f6..4816950502f2c949183ea72fcaacb60976a995cb 100644 (file)
--- a/ccan/pipecmd/pipecmd.h
+++ b/ccan/pipecmd/pipecmd.h
@@ -10,29 +10,35 @@
  * pipecmd - run a command, optionally connect pipes.
  * @infd: input fd to write to child (if non-NULL)
  * @outfd: output fd to read from child (if non-NULL)
+ * @errfd: error-output fd to read from child (if non-NULL)
  * @cmd...: NULL-terminate list of command and arguments.
  *
  * If @infd is NULL, the child's input is (read-only) /dev/null.
  * If @outfd is NULL, the child's output is (write-only) /dev/null.
+ * If @errfd is NULL, the child's stderr is (write-only) /dev/null.
+ *
+ * If @errfd == @outfd (and non-NULL) they will be shared.
  *
  * The return value is the pid of the child, or -1.
  */
-pid_t pipecmd(int *infd, int *outfd, const char *cmd, ...);
+pid_t pipecmd(int *infd, int *outfd, int *errfd, const char *cmd, ...);
 
 /**
  * pipecmdv - run a command, optionally connect pipes (stdarg version)
  * @infd: input fd to write to child (if non-NULL)
  * @outfd: output fd to read from child (if non-NULL)
+ * @errfd: error-output fd to read from child (if non-NULL)
  * @cmd: command to run.
  * @ap: argument list for arguments.
  */
-pid_t pipecmdv(int *infd, int *outfd, const char *cmd, va_list ap);
+pid_t pipecmdv(int *infd, int *outfd, int *errfd, const char *cmd, va_list ap);
 
 /**
  * pipecmdarr - run a command, optionally connect pipes (char arry version)
  * @infd: input fd to write to child (if non-NULL)
  * @outfd: output fd to read from child (if non-NULL)
+ * @errfd: error-output fd to read from child (if non-NULL)
  * @arr: NULL-terminated array for arguments (first is program to run).
  */
-pid_t pipecmdarr(int *infd, int *outfd, char *const *arr);
+pid_t pipecmdarr(int *infd, int *outfd, int *errfd, char *const *arr);
 #endif /* CCAN_PIPECMD_H */