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To reference or cite the objects present in the Software Heritage archive, permalinks based on SoftWare Hash IDentifiers (SWHIDs) must be used.
Select below a type of object currently browsed in order to display its associated SWHID and permalink.

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swh:1:cnt:28a08d6e026c22897bed7fb1732c5d1dff592ca3
Citations

This interface enables to generate software citations, provided that the root directory of browsed objects contains a citation.cff or codemeta.json file.
Select below a type of object currently browsed in order to generate citations for them.

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Generate software citation in BibTex format (requires biblatex-software package)
Generating citation ...
/**
 * Signal handling code, particularly SIGCHLD.
 */

#include "SignalHandler.h"
#include <cassert>
#include <cerrno>
#include <cstdio> // for perror
#include <cstdlib>
#include <iostream>
#include <signal.h>
#include <sys/wait.h>

using namespace std;

/** Print the specified exit status. */
static void printStatus(pid_t pid, int status)
{
    if (WIFEXITED(status))
        cerr << "PID " << pid << " exited with status "
             << WEXITSTATUS(status) << endl;
    else if (WIFSIGNALED(status))
        cerr << "PID " << pid << " killed by signal "
             << WTERMSIG(status) << endl;
    else
        cerr << "PID " << pid << " exited with code "
             << status << endl;
}

/** SIGCHLD handler. Reap child processes and report an error if any
 * fail. */
static void sigchldHandler(int sig)
{
    assert(sig == SIGCHLD);
    (void)sig;

    pid_t pid;
    int status;
    while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
        // Writing to cerr in a signal handler is not allowed, but
        // we're about to exit and an error message would be really
        // helpful.
        if (status != 0) {
            printStatus(pid, status);
            exit(EXIT_FAILURE);
        }
    }
    if (pid == -1 && errno != ECHILD) {
        perror("waitpid");
        exit(EXIT_FAILURE);
    }
}

/** Install a handler for SIGCHLD. */
void signalInit()
{
    struct sigaction action;
    action.sa_handler = sigchldHandler;
    sigemptyset(&action.sa_mask);
    action.sa_flags = SA_RESTART;
    sigaction(SIGCHLD, &action, NULL);
}

Software Heritage — Copyright (C) 2015–2025, The Software Heritage developers. License: GNU AGPLv3+.
The source code of Software Heritage itself is available on our development forge.
The source code files archived by Software Heritage are available under their own copyright and licenses.
Terms of use: Archive access, API— Contact— JavaScript license information— Web API

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