source: MondoRescue/branches/2.2.2/mindi-busybox/libbb/xfuncs.c@ 1247

/* vi: set sw=4 ts=4: */
/*
 * Utility routines.
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include "busybox.h"

#ifndef DMALLOC
#ifdef L_xmalloc
void *xmalloc(size_t size)
{
    void *ptr = malloc(size);
    if (ptr == NULL && size != 0)
        bb_error_msg_and_die(bb_msg_memory_exhausted);
    return ptr;
}
#endif

#ifdef L_xrealloc
void *xrealloc(void *ptr, size_t size)
{
    ptr = realloc(ptr, size);
    if (ptr == NULL && size != 0)
        bb_error_msg_and_die(bb_msg_memory_exhausted);
    return ptr;
}
#endif

#ifdef L_xzalloc
void *xzalloc(size_t size)
{
    void *ptr = xmalloc(size);
    memset(ptr, 0, size);
    return ptr;
}
#endif

#ifdef L_xcalloc
void *xcalloc(size_t nmemb, size_t size)
{
    void *ptr = calloc(nmemb, size);
    if (ptr == NULL && nmemb != 0 && size != 0)
        bb_error_msg_and_die(bb_msg_memory_exhausted);
    return ptr;
}
#endif
#endif /* DMALLOC */

#ifdef L_xstrdup
char * bb_xstrdup (const char *s)
{
    char *t;

    if (s == NULL)
        return NULL;

    t = strdup (s);

    if (t == NULL)
        bb_error_msg_and_die(bb_msg_memory_exhausted);

    return t;
}
#endif

#ifdef L_xstrndup
char * bb_xstrndup (const char *s, int n)
{
    char *t;

    if (ENABLE_DEBUG && s == NULL)
        bb_error_msg_and_die("bb_xstrndup bug");

    t = xmalloc(++n);

    return safe_strncpy(t,s,n);
}
#endif

#ifdef L_xfopen
FILE *bb_xfopen(const char *path, const char *mode)
{
    FILE *fp;
    if ((fp = fopen(path, mode)) == NULL)
        bb_perror_msg_and_die("%s", path);
    return fp;
}
#endif

#ifdef L_xopen
int bb_xopen(const char *pathname, int flags)
{
    return bb_xopen3(pathname, flags, 0777);
}
#endif

#ifdef L_xopen3
int bb_xopen3(const char *pathname, int flags, int mode)
{
    int ret;

    ret = open(pathname, flags, mode);
    if (ret < 0) {
        bb_perror_msg_and_die("%s", pathname);
    }
    return ret;
}
#endif

#ifdef L_xread
ssize_t bb_xread(int fd, void *buf, size_t count)
{
    ssize_t size;

    size = read(fd, buf, count);
    if (size < 0) {
        bb_perror_msg_and_die(bb_msg_read_error);
    }
    return(size);
}
#endif

#ifdef L_xread_all
void bb_xread_all(int fd, void *buf, size_t count)
{
    ssize_t size;

    while (count) {
        if ((size = bb_xread(fd, buf, count)) == 0) {   /* EOF */
            bb_error_msg_and_die("Short read");
        }
        count -= size;
        buf = ((char *) buf) + size;
    }
    return;
}
#endif

#ifdef L_xread_char
unsigned char bb_xread_char(int fd)
{
    char tmp;

    bb_xread_all(fd, &tmp, 1);

    return(tmp);
}
#endif

#ifdef L_xferror
void bb_xferror(FILE *fp, const char *fn)
{
    if (ferror(fp)) {
        bb_error_msg_and_die("%s", fn);
    }
}
#endif

#ifdef L_xferror_stdout
void bb_xferror_stdout(void)
{
    bb_xferror(stdout, bb_msg_standard_output);
}
#endif

#ifdef L_xfflush_stdout
void bb_xfflush_stdout(void)
{
    if (fflush(stdout)) {
        bb_perror_msg_and_die(bb_msg_standard_output);
    }
}
#endif

#ifdef L_spawn
// This does a fork/exec in one call, using vfork().
pid_t bb_spawn(char **argv)
{
    static int failed;
    pid_t pid;
    void *app = find_applet_by_name(argv[0]);

    // Be nice to nommu machines.
    failed = 0;
    pid = vfork();
    if (pid < 0) return pid;
    if (!pid) {
        execvp(app ? CONFIG_BUSYBOX_EXEC_PATH : *argv, argv);

        // We're sharing a stack with blocked parent, let parent know we failed
        // and then exit to unblock parent (but don't run atexit() stuff, which
        // would screw up parent.)

        failed = -1;
        _exit(0);
    }
    return failed ? failed : pid;
}
#endif

#ifdef L_xspawn
pid_t bb_xspawn(char **argv)
{
    pid_t pid = bb_spawn(argv);
    if (pid < 0) bb_perror_msg_and_die("%s", *argv);
    return pid;
}
#endif

#ifdef L_wait4
int wait4pid(int pid)
{
    int status;

    if (pid == -1 || waitpid(pid, &status, 0) == -1) return -1;
    if (WIFEXITED(status)) return WEXITSTATUS(status);
    if (WIFSIGNALED(status)) return WTERMSIG(status);
    return 0;
}
#endif  

#ifdef L_setuid
void xsetgid(gid_t gid)
{
    if (setgid(gid)) bb_error_msg_and_die("setgid");
}

void xsetuid(uid_t uid)
{
    if (setuid(uid)) bb_error_msg_and_die("setuid");
}
#endif