[thirdparty/squid.git] / src / unlinkd_daemon.cc

/*
 * Copyright (C) 1996-2025 The Squid Software Foundation and contributors
 *
 * Squid software is distributed under GPLv2+ license and includes
 * contributions from numerous individuals and organizations.
 * Please see the COPYING and CONTRIBUTORS files for details.
 */

/* DEBUG: section --    Unlink Daemon */

#define SQUID_HELPER 1

#include "squid.h"

#include <iostream>
#include <cstdio>
#if HAVE_PATHS_H
#include <paths.h>
#endif

/**
 \defgroup unlinkd unlinkd
 \ingroup ExternalPrograms
 \par
    The unlink(2) system call can cause a process to block
    for a significant amount of time.  Therefore we do not want
    to make unlink() calls from Squid.  Instead we pass them
    to this external process.
 */

/// \ingroup unlinkd
#define UNLINK_BUF_LEN 1024

/**
 \ingroup unlinkd
 \par This is the unlinkd external process.
 *
 \par
 *    unlinkd receives the full path of any files to be removed
 *    from stdin, each on its own line.
 *
 \par
 *    The results for each file are printed to stdout in the order
 *    they were received
 *
 \param argc Ignored.
 \param argv Ignored.
 \retval ERR An error occurred removing the file.
 \retval OK  The file has been removed.
 */
int
main(int, char *[])
{
    std::string sbuf;
    close(2);
    if (open(_PATH_DEVNULL, O_RDWR) < 0) {
        ; // the irony of having to close(2) earlier is that we cannot report this failure.
    }
    while (getline(std::cin, sbuf)) {
        // tailing newline is removed by getline
        const int rv = remove(sbuf.c_str());
        if (rv < 0)
            std::cout << "ERR" << std::endl; // endl flushes
        else
            std::cout << "OK" << std::endl;
    }

    return EXIT_SUCCESS;
}
Commit	Line	Data
	1	/*
	2	* Copyright (C) 1996-2025 The Squid Software Foundation and contributors
	3	*
	4	* Squid software is distributed under GPLv2+ license and includes
	5	* contributions from numerous individuals and organizations.
	6	* Please see the COPYING and CONTRIBUTORS files for details.
	7	*/
	8
	9	/* DEBUG: section -- Unlink Daemon */
	10
	11	#define SQUID_HELPER 1
	12
	13	#include "squid.h"
	14
	15	#include <iostream>
	16	#include <cstdio>
	17	#if HAVE_PATHS_H
	18	#include <paths.h>
	19	#endif
	20
	21	/**
	22	\defgroup unlinkd unlinkd
	23	\ingroup ExternalPrograms
	24	\par
	25	The unlink(2) system call can cause a process to block
	26	for a significant amount of time. Therefore we do not want
	27	to make unlink() calls from Squid. Instead we pass them
	28	to this external process.
	29	*/
	30
	31	/// \ingroup unlinkd
	32	#define UNLINK_BUF_LEN 1024
	33
	34	/**
	35	\ingroup unlinkd
	36	\par This is the unlinkd external process.
	37	*
	38	\par
	39	* unlinkd receives the full path of any files to be removed
	40	* from stdin, each on its own line.
	41	*
	42	\par
	43	* The results for each file are printed to stdout in the order
	44	* they were received
	45	*
	46	\param argc Ignored.
	47	\param argv Ignored.
	48	\retval ERR An error occurred removing the file.
	49	\retval OK The file has been removed.
	50	*/
	51	int
	52	main(int, char *[])
	53	{
	54	std::string sbuf;
	55	close(2);
	56	if (open(_PATH_DEVNULL, O_RDWR) < 0) {
	57	; // the irony of having to close(2) earlier is that we cannot report this failure.
	58	}
	59	while (getline(std::cin, sbuf)) {
	60	// tailing newline is removed by getline
	61	const int rv = remove(sbuf.c_str());
	62	if (rv < 0)
	63	std::cout << "ERR" << std::endl; // endl flushes
	64	else
	65	std::cout << "OK" << std::endl;
	66	}
	67
	68	return EXIT_SUCCESS;
	69	}
	70