250 lines
8.2 KiB
C
250 lines
8.2 KiB
C
/* common.h - prototypes for the common useful functions
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Copyright (C) 2000 Russell Kroll <rkroll@exploits.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef NUT_COMMON_H_SEEN
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#define NUT_COMMON_H_SEEN 1
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#include "config.h" /* must be the first header */
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/* Need this on AIX when using xlc to get alloca */
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#ifdef _AIX
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#pragma alloca
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#endif /* _AIX */
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#ifdef HAVE_SYS_SIGNAL_H
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#include <sys/signal.h>
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#endif
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#ifdef HAVE_SIGNAL_H
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#include <signal.h>
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#endif
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#include <stdlib.h>
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#ifdef HAVE_STRINGS_H
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#include <strings.h> /* for strncasecmp() and strcasecmp() */
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h> /* for strdup() and many others */
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#endif
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#include <syslog.h>
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#include <unistd.h>
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#include <assert.h>
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#include "timehead.h"
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#include "attribute.h"
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#include "proto.h"
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#include "str.h"
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#ifdef __cplusplus
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/* *INDENT-OFF* */
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extern "C" {
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/* *INDENT-ON* */
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#endif
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extern const char *UPS_VERSION;
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/* Use in code to notify the developers and quiesce the compiler that
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* (for this codepath) the argument or variable is unused intentionally.
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* void f(int x) {
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* NUT_UNUSED_VARIABLE(x);
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* ...
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* }
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*
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* Note that solutions which mark up function arguments or employ this or
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* that __attribute__ proved not portable enough for wherever NUT builds.
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*/
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#define NUT_UNUSED_VARIABLE(x) (void)(x)
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/** @brief Default timeout (in seconds) for network operations, as used by `upsclient` and `nut-scanner`. */
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#define DEFAULT_NETWORK_TIMEOUT 5
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/** @brief Default timeout (in seconds) for retrieving the result of a `TRACKING`-enabled operation (e.g. `INSTCMD`, `SET VAR`). */
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#define DEFAULT_TRACKING_TIMEOUT 10
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/* get the syslog ready for us */
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void open_syslog(const char *progname);
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/* close ttys and become a daemon */
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void background(void);
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/* do this here to keep pwd/grp stuff out of the main files */
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struct passwd *get_user_pwent(const char *name);
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/* change to the user defined in the struct */
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void become_user(struct passwd *pw);
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/* drop down into a directory and throw away pointers to the old path */
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void chroot_start(const char *path);
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/* write a pid file - <name> is a full pathname *or* just the program name */
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void writepid(const char *name);
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/* parses string buffer into a pid_t if it passes
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* a few sanity checks; returns -1 on error */
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pid_t parsepid(const char *buf);
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/* send a signal to another running process */
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int sendsignal(const char *progname, int sig);
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int snprintfcat(char *dst, size_t size, const char *fmt, ...)
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__attribute__ ((__format__ (__printf__, 3, 4)));
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/* Report maximum platform value for the pid_t */
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pid_t get_max_pid_t(void);
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/* send sig to pid after some sanity checks, returns
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* -1 for error, or zero for a successfully sent signal */
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int sendsignalpid(pid_t pid, int sig);
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/* open <pidfn>, get the pid, then send it <sig>
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* returns zero for successfully sent signal,
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* negative for errors:
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* -3 PID file not found
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* -2 PID file not parsable
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* -1 Error sending signal
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*/
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int sendsignalfn(const char *pidfn, int sig);
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const char *xbasename(const char *file);
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/* enable writing upslog_with_errno() and upslogx() type messages to
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the syslog */
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void syslogbit_set(void);
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/* Return the default path for the directory containing configuration files */
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const char * confpath(void);
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/* Return the default path for the directory containing state files */
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const char * dflt_statepath(void);
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/* Return the alternate path for pid files */
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const char * altpidpath(void);
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/* Die with a standard message if socket filename is too long */
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void check_unix_socket_filename(const char *fn);
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/* upslog*() messages are sent to syslog always;
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* their life after that is out of NUT's control */
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void upslog_with_errno(int priority, const char *fmt, ...)
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__attribute__ ((__format__ (__printf__, 2, 3)));
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void upslogx(int priority, const char *fmt, ...)
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__attribute__ ((__format__ (__printf__, 2, 3)));
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/* upsdebug*() messages are only logged if debugging
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* level is high enough. To speed up a bit (minimize
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* passing of ultimately ignored data trough the stack)
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* these are "hidden" implementations wrapped into
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* macros for earlier routine names spread around the
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* codebase, they would check debug level first and
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* only if logging should happen - call the routine
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* and pass around pointers and other data.
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*/
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void s_upsdebug_with_errno(int level, const char *fmt, ...)
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__attribute__ ((__format__ (__printf__, 2, 3)));
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void s_upsdebugx(int level, const char *fmt, ...)
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__attribute__ ((__format__ (__printf__, 2, 3)));
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void s_upsdebug_hex(int level, const char *msg, const void *buf, size_t len);
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void s_upsdebug_ascii(int level, const char *msg, const void *buf, size_t len);
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/* These macros should help avoid run-time overheads
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* passing data for messages nobody would ever see.
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*
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* Also NOTE: the "level" may be specified by callers in various ways,
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* e.g. as a "X ? Y : Z" style expression; to catch those expansions
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* transparently we hide them into parentheses as "(label)".
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*
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* For stricter C99 compatibility, all parameters specified to a macro
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* must be populated by caller (so we do not handle "fmt, args..." where
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* the args part may be skipped by caller because fmt is a fixed string).
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* Note it is then up to the caller (and compiler checks) that at least
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* one argument is provided, the format string (maybe fixed) -- as would
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* be required by the actual s_upsdebugx*() method after macro evaluation.
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*/
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#define upsdebug_with_errno(level, ...) \
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do { if (nut_debug_level >= (level)) { s_upsdebug_with_errno((level), __VA_ARGS__); } } while(0)
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#define upsdebugx(level, ...) \
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do { if (nut_debug_level >= (level)) { s_upsdebugx((level), __VA_ARGS__); } } while(0)
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#define upsdebug_hex(level, msg, buf, len) \
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do { if (nut_debug_level >= (level)) { s_upsdebug_hex((level), msg, buf, len); } } while(0)
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#define upsdebug_ascii(level, msg, buf, len) \
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do { if (nut_debug_level >= (level)) { s_upsdebug_ascii((level), msg, buf, len); } } while(0)
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void fatal_with_errno(int status, const char *fmt, ...)
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__attribute__ ((__format__ (__printf__, 2, 3))) __attribute__((noreturn));
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void fatalx(int status, const char *fmt, ...)
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__attribute__ ((__format__ (__printf__, 2, 3))) __attribute__((noreturn));
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extern int nut_debug_level;
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extern int nut_log_level;
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void *xmalloc(size_t size);
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void *xcalloc(size_t number, size_t size);
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void *xrealloc(void *ptr, size_t size);
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char *xstrdup(const char *string);
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ssize_t select_read(const int fd, void *buf, const size_t buflen, const time_t d_sec, const suseconds_t d_usec);
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ssize_t select_write(const int fd, const void *buf, const size_t buflen, const time_t d_sec, const suseconds_t d_usec);
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char * get_libname(const char* base_libname);
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/* Buffer sizes used for various functions */
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#define SMALLBUF 512
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#define LARGEBUF 1024
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/** @brief (Minimum) Size that a string must have to hold a UUID4 (i.e. UUID4 length + the terminating null character). */
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#define UUID4_LEN 37
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/* Provide declarations for getopt() global variables */
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#ifdef NEED_GETOPT_H
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#include <getopt.h>
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#else
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#ifdef NEED_GETOPT_DECLS
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extern char *optarg;
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extern int optind;
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#endif /* NEED_GETOPT_DECLS */
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#endif /* HAVE_GETOPT_H */
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/* logging flags: bitmask! */
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#define UPSLOG_STDERR 0x0001
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#define UPSLOG_SYSLOG 0x0002
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#define UPSLOG_STDERR_ON_FATAL 0x0004
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#define UPSLOG_SYSLOG_ON_FATAL 0x0008
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#ifndef HAVE_SETEUID
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# define seteuid(x) setresuid(-1,x,-1) /* Works for HP-UX 10.20 */
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# define setegid(x) setresgid(-1,x,-1) /* Works for HP-UX 10.20 */
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#endif
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#ifdef __cplusplus
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/* *INDENT-OFF* */
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}
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/* *INDENT-ON* */
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#endif
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#endif /* NUT_COMMON_H_SEEN */
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