See the manual for descriptions.
trace.h track.h unihash.h \
pool.h \
atom.h assoc.h darray.h dstr.h dspool.h hash.h sym.h crc32.h \
+ daemonize.h versioncmp.h \
env.h fdflags.h fdpass.h fwatch.h lock.h \
bres.h conn.h lbuf.h ident.h pkbuf.h sel.h selbuf.h selpk.h sig.h \
tv.h \
sym.c \
crc32.c crc32-tab.c \
unihash.c unihash-global.c \
+ daemonize.c versioncmp.c \
env.c fdflags.c fdpass.c fwatch.c lock.c \
@BRES_SOURCE@.c \
conn.c lbuf.c ident.c pkbuf.c sel.c selbuf.c selpk.c sig.c \
--- /dev/null
+/* -*-c-*-
+ *
+ * $Id$
+ *
+ * Become a daemon, detaching from terminals
+ *
+ * (c) 2007 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------*
+ *
+ * This file is part of the mLib utilities library.
+ *
+ * mLib is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * mLib is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with mLib; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <sys/types.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+
+#include "daemonize.h"
+
+/*----- Main code ---------------------------------------------------------*/
+
+/* --- @detachtty@ --- *
+ *
+ * Arguments: ---
+ *
+ * Returns: ---
+ *
+ * Use: Detaches from the current terminal and ensures it can never
+ * acquire a new one. Calls @fork@.
+ */
+
+void detachtty(void)
+{
+#ifdef TIOCNOTTY
+ {
+ int fd;
+ if ((fd = open("/dev/tty", O_RDONLY)) >= 0) {
+ ioctl(fd, TIOCNOTTY);
+ close(fd);
+ }
+ }
+#endif
+ setsid();
+ if (fork() > 0)
+ _exit(0);
+}
+
+/* --- @daemonize@ --- *
+ *
+ * Arguments: ---
+ *
+ * Returns: Zero if OK, nonzero on failure.
+ *
+ * Use: Becomes a daemon.
+ */
+
+int daemonize(void)
+{
+ pid_t kid;
+
+ if ((kid = fork()) < 0)
+ return (-1);
+ if (kid)
+ _exit(0);
+ detachtty();
+ return (0);
+}
+
+/*----- That's all, folks -------------------------------------------------*/
--- /dev/null
+/* -*-c-*-
+ *
+ * $Id$
+ *
+ * Become a daemon, detaching from terminals
+ *
+ * (c) 2007 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------*
+ *
+ * This file is part of the mLib utilities library.
+ *
+ * mLib is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * mLib is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with mLib; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+#ifndef MLIB_DAEMONIZE_H
+#define MLIB_DAEMONIZE_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/*----- Functions provided ------------------------------------------------*/
+
+/* --- @detachtty@ --- *
+ *
+ * Arguments: ---
+ *
+ * Returns: ---
+ *
+ * Use: Detaches from the current terminal and ensures it can never
+ * acquire a new one. Calls @fork@.
+ */
+
+extern void detachtty(void);
+
+/* --- @daemonize@ --- *
+ *
+ * Arguments: ---
+ *
+ * Returns: Zero if OK, nonzero on failure.
+ *
+ * Use: Becomes a daemon.
+ */
+
+extern int daemonize(void);
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif
MANPAGESEXT = \
alloc.3 arena.3 assoc.3 atom.3 base32.3 base64.3 bits.3 bres.3 \
- buf.3 conn.3 crc32.3 darray.3 dspool.3 dstr.3 env.3 exc.3 \
- fdflags.3 fwatch.3 hash.3 ident.3 lbuf.3 lock.3 mLib.3 mdwopt.3 \
- pkbuf.3 pool.3 quis.3 report.3 sel.3 selbuf.3 selpk.3 sig.3 \
- str.3 sub.3 sym.3 testrig.3 trace.3 tv.3 url.3 hex.3 fdpass.3 \
- macros.3 unihash.3
+ buf.3 conn.3 crc32.3 darray.3 daemonize.3 dspool.3 dstr.3 env.3 \
+ exc.3 fdflags.3 fwatch.3 hash.3 ident.3 lbuf.3 lock.3 mLib.3 \
+ mdwopt.3 pkbuf.3 pool.3 quis.3 report.3 sel.3 selbuf.3 selpk.3 \
+ sig.3 str.3 sub.3 sym.3 testrig.3 trace.3 tv.3 url.3 hex.3 fdpass.3 \
+ macros.3 unihash.3 versioncmp.3
install-man: $(MANPAGES)
@$(NORMAL_INSTALL)
--- /dev/null
+.\" -*-nroff-*-
+.TH daemonize 3 "6 January 2007" "Straylight/Edgeware" "mLib utilities library"
+.SH NAME
+daemonize \- become a background process
+.\" @detachtty
+.\" @daemonize
+.SH SYNOPSIS
+.nf
+.B "#include <mLib/daemonize.h>"
+
+.B "void detachtty(void);"
+.B "int daemonize(void);"
+.fi
+.SH DESCRIPTION
+The
+.B daemonize
+function causes the current process to become a background process. It
+detaches from its controlling terminal and arranges never to acquire
+another controlling terminal. If it fails for some reason (probably
+because
+.BR fork (2)
+failed),
+.B daemonize
+returns \-1 and sets
+.BR errno ;
+on success, it returns 0.
+.PP
+The
+.B detachtty
+does half of the job of
+.BR daemonize :
+it detaches from its controlling terminal, and calls
+.BR setsid (2)
+and
+.BR fork (2)
+so that it can't acquire a new controlling terminal in future. Errors
+are ignored.
+.SH SEE ALSO
+.BR mLib (3).
+.SH AUTHOR
+Mark Wooding, <mdw@distorted.org.uk>
--- /dev/null
+.\" -*-nroff-*-
+.TH versioncmp 3 "6 January 2007" "Straylight/Edgeware" "mLib utilities library"
+.SH NAME
+versioncmp \- compare Debian-format version numbers
+.\" @versioncmp
+.SH SYNOPSIS
+.nf
+.B "#include <mLib/versioncmp.h>"
+
+.BI "int versioncmp(const char *" va ", const char *" vb ");"
+.fi
+.SH DESCRIPTION
+The
+.B versioncmp
+function compares version strings.
+.PP
+The format of version numbers considered is
+.IP
+.RI [ epoch
+.BR : ]
+.I main
+.RB [ \-
+.IR sub ]
+.PP
+The
+.I main
+part may contain colons or hyphens if there is an
+.I epoch
+or
+.IR sub ,
+respectively. Version strings are compared componentwise: first epochs,
+then main parts, and finally subparts.
+.PP
+The component comparison is done as follows. First, the initial
+subsequence of nondigit characters is extracted from each string, and
+these are compared lexicographically, using ASCII ordering, except that
+letters precede non-letters. If both are the same, an initial sequence
+of digits is extracted from the remaining parts of the version strings,
+and these are compared numerically (an empty sequence being considered
+to have the value zero). This process is repeated until we have a
+winner or until both strings are exhausted.
+.PP
+The return value is 0 if the two strings are equal, \-1 if
+.I va
+is older than
+.IR vb ,
+or +1 if
+.I va
+is newer than
+.IR vb .
+.SH SEE ALSO
+.BR mLib (3).
+.PP
+.IR "Debian Policy Manual" .
+.SH AUTHOR
+Mark Wooding, <mdw@distorted.org.uk>
--- /dev/null
+/* -*-c-*-
+ *
+ * $Id$
+ *
+ * Compare version numbers using the Debian algorithm
+ *
+ * (c) 2007 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------*
+ *
+ * This file is part of the mLib utilities library.
+ *
+ * mLib is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * mLib is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with mLib; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <ctype.h>
+#include <string.h>
+
+#include "versioncmp.h"
+
+/*----- Main code ---------------------------------------------------------*/
+
+/* --- @versioncmp@ --- *
+ *
+ * Arguments: @const char *va, *vb@ = two version strings
+ *
+ * Returns: Less than, equal to, or greater than zero, according to
+ * whether @va@ is less than, equal to, or greater than @vb@.
+ *
+ * Use: Compares version number strings.
+ *
+ * The algorithm is an extension of the Debian version
+ * comparison algorithm. A version number consists of three
+ * components:
+ *
+ * [EPOCH :] MAIN [- SUB]
+ *
+ * The MAIN part may contain colons or hyphens if there is an
+ * EPOCH or SUB, respectively. Version strings are compared
+ * componentwise: first epochs, then main parts, and finally
+ * subparts.
+ *
+ * The component comparison is done as follows. First, the
+ * initial subsequence of nondigit characters is extracted from
+ * each string, and these are compared lexicographically, using
+ * ASCII ordering, except that letters precede non-letters. If
+ * both are the same, an initial sequence of digits is extracted
+ * from the remaining parts of the version strings, and these
+ * are compared numerically (an empty sequence being considered
+ * to have the value zero). This process is repeated until we
+ * have a winner or until both strings are exhausted.
+ */
+
+struct vinfo {
+ const char *e, *el;
+ const char *m, *ml;
+ const char *s, *sl;
+};
+
+static int vint(const char **vv, const char *vl)
+{
+ int n = 0;
+ const char *v = *vv;
+ int ch;
+
+ while (v < vl) {
+ ch = *v;
+ if (!isdigit((unsigned char)ch))
+ break;
+ v++;
+ n = n * 10 + (ch - '0');
+ }
+ *vv = v;
+ return (n);
+}
+
+static const char *vchr(const char **vv, const char *vl)
+{
+ const char *v = *vv;
+ const char *b = v;
+ int ch;
+
+ while (v < vl) {
+ ch = *v;
+ if (isdigit((unsigned char)ch))
+ break;
+ v++;
+ }
+ *vv = v;
+ return (b);
+}
+
+#define CMP(x, y) ((x) < (y) ? -1 : +1)
+
+static int vcmp(const char *va, const char *val,
+ const char *vb, const char *vbl)
+{
+ const char *pa, *pb;
+ int ia, ib;
+
+ for (;;) {
+
+ /* --- See if we're done --- */
+
+ if (va == val && vb == vbl)
+ return (0);
+
+ /* --- Compare nondigit portions --- */
+
+ pa = vchr(&va, val); pb = vchr(&vb, vbl);
+ for (;;) {
+ if (pa == va && pb == vb)
+ break;
+ else if (pa == va)
+ return (-1);
+ else if (pb == vb)
+ return (+1);
+ else if (*pa == *pb) {
+ pa++; pb++;
+ continue;
+ } else if (isalpha((unsigned char)*pa) == isalpha((unsigned char)*pb))
+ return (CMP(*pa, *pb));
+ else if (isalpha((unsigned char)*pa))
+ return (-1);
+ else
+ return (+1);
+ }
+
+ /* --- Compare digit portions --- */
+
+ ia = vint(&va, val); ib = vint(&vb, vbl);
+ if (ia != ib)
+ return (CMP(ia, ib));
+ }
+}
+
+static void vsplit(const char *v, struct vinfo *vi)
+{
+ const char *p;
+ size_t n;
+
+ if ((p = strchr(v, ':')) == 0)
+ vi->e = vi->el = 0;
+ else {
+ vi->e = v;
+ vi->el = p;
+ v = p + 1;
+ }
+
+ n = strlen(v);
+ if ((p = strrchr(v, '-')) == 0)
+ vi->s = vi->sl = 0;
+ else {
+ vi->s = p + 1;
+ vi->sl = v + n;
+ n = p - v;
+ }
+
+ vi->m = v;
+ vi->ml = v + n;
+}
+
+int versioncmp(const char *va, const char *vb)
+{
+ struct vinfo via, vib;
+ int rc;
+
+ vsplit(va, &via); vsplit(vb, &vib);
+ if ((rc = vcmp(via.e, via.el, vib.e, vib.el)) != 0 ||
+ (rc = vcmp(via.m, via.ml, vib.m, vib.ml)) != 0 ||
+ (rc = vcmp(via.s, via.sl, vib.s, vib.sl)) != 0)
+ return (rc);
+ return (0);
+}
+
+/*----- That's all, folks -------------------------------------------------*/
--- /dev/null
+/* -*-c-*-
+ *
+ * $Id$
+ *
+ * Compare version numbers using the Debian algorithm
+ *
+ * (c) 2007 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------*
+ *
+ * This file is part of the mLib utilities library.
+ *
+ * mLib is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * mLib is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with mLib; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+#ifndef MLIB_VERSIONCMP_H
+#define MLIB_VERSIONCMP_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/*----- Functions provided ------------------------------------------------*/
+
+/* --- @versioncmp@ --- *
+ *
+ * Arguments: @const char *va, *vb@ = two version strings
+ *
+ * Returns: Less than, equal to, or greater than zero, according to
+ * whether @va@ is less than, equal to, or greater than @vb@.
+ *
+ * Use: Compares version number strings.
+ *
+ * The algorithm is an extension of the Debian version
+ * comparison algorithm. A version number consists of three
+ * components:
+ *
+ * [EPOCH :] MAIN [- SUB]
+ *
+ * The MAIN part may contain colons or hyphens if there is an
+ * EPOCH or SUB, respectively. Version strings are compared
+ * componentwise: first epochs, then main parts, and finally
+ * subparts.
+ *
+ * The component comparison is done as follows. First, the
+ * initial subsequence of nondigit characters is extracted from
+ * each string, and these are compared lexicographically, using
+ * ASCII ordering, except that letters precede non-letters. If
+ * both are the same, an initial sequence of digits is extracted
+ * from the remaining parts of the version strings, and these
+ * are compared numerically (an empty sequence being considered
+ * to have the value zero). This process is repeated until we
+ * have a winner or until both strings are exhausted.
+ */
+
+extern int versioncmp(const char */*va*/, const char */*vb*/);
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif
~mdw / mLib / commitdiff