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/*++
/* NAME
/* mail_run 3
/* SUMMARY
/* run mail component program
/* SYNOPSIS
/* #include <mail_run.h>
/*
/* int mail_run_foreground(dir, argv)
/* const char *dir;
/* char **argv;
/*
/* int mail_run_background(dir, argv)
/* const char *dir;
/* char **argv;
/*
/* NORETURN mail_run_replace(dir, argv)
/* const char *dir;
/* char **argv;
/* DESCRIPTION
/* This module runs programs that live in the mail program directory.
/* Each routine takes a directory and a command-line array. The program
/* pathname is built by prepending the directory and a slash to the
/* command name.
/*
/* mail_run_foreground() runs the named command in the foreground and
/* waits until the command terminates.
/*
/* mail_run_background() runs the named command in the background.
/*
/* mail_run_replace() attempts to replace the current process by
/* an instance of the named command. This function never returns.
/*
/* Arguments:
/* .IP argv
/* A null-terminated command-line vector. The first array element
/* is the base name of the program to be executed.
/* DIAGNOSTICS
/* The result is (-1) if the command could not be run. Otherwise,
/* mail_run_foreground() returns the termination status of the
/* command. mail_run_background() returns the process id in case
/* of success.
/* CONFIGURATION PARAMETERS
/* fork_attempts: number of attempts to fork() a process;
/* fork_delay: delay in seconds between fork() attempts.
/* 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
/*--*/
/* System library. */
#include <sys_defs.h>
#include <sys/wait.h>
#include <unistd.h>
#include <errno.h>
/* Utility library. */
#include <msg.h>
#include <stringops.h>
#include <mymalloc.h>
/* Global library. */
#include "mail_params.h"
#include "mail_run.h"
/* mail_run_foreground - run command in foreground */
int mail_run_foreground(const char *dir, char **argv)
{
int count;
char *path;
WAIT_STATUS_T status;
int pid;
int wpid;
#define RETURN(x) { myfree(path); return(x); }
path = concatenate(dir, "/", argv[0], (char *) 0);
for (count = 0; count < var_fork_tries; count++) {
switch (pid = fork()) {
case -1:
msg_warn("fork %s: %m", path);
break;
case 0:
/* Reset the msg_cleanup() handlers in the child process. */
(void) msg_cleanup((MSG_CLEANUP_FN) 0);
execv(path, argv);
msg_fatal("execv %s: %m", path);
default:
do {
wpid = waitpid(pid, &status, 0);
} while (wpid == -1 && errno == EINTR);
RETURN(wpid == -1 ? -1 :
WIFEXITED(status) ? WEXITSTATUS(status) : 1)
}
sleep(var_fork_delay);
}
RETURN(-1);
}
/* mail_run_background - run command in background */
int mail_run_background(const char *dir, char **argv)
{
int count;
char *path;
int pid;
#define RETURN(x) { myfree(path); return(x); }
path = concatenate(dir, "/", argv[0], (char *) 0);
for (count = 0; count < var_fork_tries; count++) {
switch (pid = fork()) {
case -1:
msg_warn("fork %s: %m", path);
break;
case 0:
/* Reset the msg_cleanup() handlers in the child process. */
(void) msg_cleanup((MSG_CLEANUP_FN) 0);
execv(path, argv);
msg_fatal("execv %s: %m", path);
default:
RETURN(pid);
}
sleep(var_fork_delay);
}
RETURN(-1);
}
/* mail_run_replace - run command, replacing current process */
NORETURN mail_run_replace(const char *dir, char **argv)
{
char *path;
path = concatenate(dir, "/", argv[0], (char *) 0);
execv(path, argv);
msg_fatal("execv %s: %m", path);
}
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