/usr/include/postfix/spawn_command.h is in postfix-dev 3.1.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#define _SPAWN_COMMAND_H_INCLUDED_
/*++
/* NAME
/* spawn_command 3h
/* SUMMARY
/* run external command
/* SYNOPSIS
/* #include <spawn_command.h>
/* DESCRIPTION
/* .nf
/*
* Utility library.
*/
#include <check_arg.h>
/* Legacy API: type-unchecked arguments, internal use. */
#define SPAWN_CMD_END 0 /* terminator */
#define SPAWN_CMD_ARGV 1 /* command is array */
#define SPAWN_CMD_COMMAND 2 /* command is string */
#define SPAWN_CMD_STDIN 3 /* mail_copy() flags */
#define SPAWN_CMD_STDOUT 4 /* mail_copy() sender */
#define SPAWN_CMD_STDERR 5 /* mail_copy() recipient */
#define SPAWN_CMD_UID 6 /* privileges */
#define SPAWN_CMD_GID 7 /* privileges */
#define SPAWN_CMD_TIME_LIMIT 8 /* time limit */
#define SPAWN_CMD_ENV 9 /* extra environment */
#define SPAWN_CMD_SHELL 10 /* alternative shell */
#define SPAWN_CMD_EXPORT 11 /* exportable parameters */
/* Safer API: type-checked arguments, external use. */
#define CA_SPAWN_CMD_END SPAWN_CMD_END
#define CA_SPAWN_CMD_ARGV(v) SPAWN_CMD_ARGV, CHECK_PPTR(CA_SPAWN_CMD, char, (v))
#define CA_SPAWN_CMD_COMMAND(v) SPAWN_CMD_COMMAND, CHECK_CPTR(CA_SPAWN_CMD, char, (v))
#define CA_SPAWN_CMD_STDIN(v) SPAWN_CMD_STDIN, CHECK_VAL(CA_SPAWN_CMD, int, (v))
#define CA_SPAWN_CMD_STDOUT(v) SPAWN_CMD_STDOUT, CHECK_VAL(CA_SPAWN_CMD, int, (v))
#define CA_SPAWN_CMD_STDERR(v) SPAWN_CMD_STDERR, CHECK_VAL(CA_SPAWN_CMD, int, (v))
#define CA_SPAWN_CMD_UID(v) SPAWN_CMD_UID, CHECK_VAL(CA_SPAWN_CMD, uid_t, (v))
#define CA_SPAWN_CMD_GID(v) SPAWN_CMD_GID, CHECK_VAL(CA_SPAWN_CMD, gid_t, (v))
#define CA_SPAWN_CMD_TIME_LIMIT(v) SPAWN_CMD_TIME_LIMIT, CHECK_VAL(CA_SPAWN_CMD, int, (v))
#define CA_SPAWN_CMD_ENV(v) SPAWN_CMD_ENV, CHECK_PPTR(CA_SPAWN_CMD, char, (v))
#define CA_SPAWN_CMD_SHELL(v) SPAWN_CMD_SHELL, CHECK_CPTR(CA_SPAWN_CMD, char, (v))
#define CA_SPAWN_CMD_EXPORT(v) SPAWN_CMD_EXPORT, CHECK_PPTR(CA_SPAWN_CMD, char, (v))
CHECK_VAL_HELPER_DCL(CA_SPAWN_CMD, uid_t);
CHECK_VAL_HELPER_DCL(CA_SPAWN_CMD, int);
CHECK_VAL_HELPER_DCL(CA_SPAWN_CMD, gid_t);
CHECK_PPTR_HELPER_DCL(CA_SPAWN_CMD, char);
CHECK_CPTR_HELPER_DCL(CA_SPAWN_CMD, char);
extern WAIT_STATUS_T spawn_command(int,...);
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*--*/
#endif
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