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    Contents of /tags/mkinitrd-6_1_5/busybox/libbb/verror_msg.c

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    Revision 899 - (show annotations) (download)
    Wed Aug 5 17:52:52 2009 UTC (14 years, 10 months ago) by niro
    File MIME type: text/plain
    File size: 3373 byte(s) 
    tagged 'mkinitrd-6_1_5'
    1 /* vi: set sw=4 ts=4: */
    2 /*
    3 * Utility routines.
    4 *
    5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
    6 *
    7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
    8 */
    9
    10 #include "libbb.h"
    11 #include <syslog.h>
    12
    13 smallint logmode = LOGMODE_STDIO;
    14 const char *msg_eol = "\n";
    15
    16 void FAST_FUNC bb_verror_msg(const char *s, va_list p, const char* strerr)
    17 {
    18 char *msg;
    19 int applet_len, strerr_len, msgeol_len, used;
    20
    21 if (!logmode)
    22 return;
    23
    24 if (!s) /* nomsg[_and_die] uses NULL fmt */
    25 s = ""; /* some libc don't like printf(NULL) */
    26
    27 used = vasprintf(&msg, s, p);
    28 if (used < 0)
    29 return;
    30
    31 /* This is ugly and costs +60 bytes compared to multiple
    32 * fprintf's, but is guaranteed to do a single write.
    33 * This is needed for e.g. httpd logging, when multiple
    34 * children can produce log messages simultaneously. */
    35
    36 applet_len = strlen(applet_name) + 2; /* "applet: " */
    37 strerr_len = strerr ? strlen(strerr) : 0;
    38 msgeol_len = strlen(msg_eol);
    39 /* +3 is for ": " before strerr and for terminating NUL */
    40 msg = xrealloc(msg, applet_len + used + strerr_len + msgeol_len + 3);
    41 /* TODO: maybe use writev instead of memmoving? Need full_writev? */
    42 memmove(msg + applet_len, msg, used);
    43 used += applet_len;
    44 strcpy(msg, applet_name);
    45 msg[applet_len - 2] = ':';
    46 msg[applet_len - 1] = ' ';
    47 if (strerr) {
    48 if (s[0]) { /* not perror_nomsg? */
    49 msg[used++] = ':';
    50 msg[used++] = ' ';
    51 }
    52 strcpy(&msg[used], strerr);
    53 used += strerr_len;
    54 }
    55 strcpy(&msg[used], msg_eol);
    56
    57 if (logmode & LOGMODE_STDIO) {
    58 fflush(stdout);
    59 full_write(STDERR_FILENO, msg, used + msgeol_len);
    60 }
    61 if (logmode & LOGMODE_SYSLOG) {
    62 syslog(LOG_ERR, "%s", msg + applet_len);
    63 }
    64 free(msg);
    65 }
    66
    67
    68 #ifdef VERSION_WITH_WRITEV
    69
    70 /* Code size is approximately the same, but currently it's the only user
    71 * of writev in entire bbox. __libc_writev in uclibc is ~50 bytes. */
    72
    73 void FAST_FUNC bb_verror_msg(const char *s, va_list p, const char* strerr)
    74 {
    75 int strerr_len, msgeol_len;
    76 struct iovec iov[3];
    77
    78 #define used (iov[2].iov_len)
    79 #define msgv (iov[2].iov_base)
    80 #define msgc ((char*)(iov[2].iov_base))
    81 #define msgptr (&(iov[2].iov_base))
    82
    83 if (!logmode)
    84 return;
    85
    86 if (!s) /* nomsg[_and_die] uses NULL fmt */
    87 s = ""; /* some libc don't like printf(NULL) */
    88
    89 /* Prevent "derefing type-punned ptr will break aliasing rules" */
    90 used = vasprintf((char**)(void*)msgptr, s, p);
    91 if (used < 0)
    92 return;
    93
    94 /* This is ugly and costs +60 bytes compared to multiple
    95 * fprintf's, but is guaranteed to do a single write.
    96 * This is needed for e.g. httpd logging, when multiple
    97 * children can produce log messages simultaneously. */
    98
    99 strerr_len = strerr ? strlen(strerr) : 0;
    100 msgeol_len = strlen(msg_eol);
    101 /* +3 is for ": " before strerr and for terminating NUL */
    102 msgv = xrealloc(msgv, used + strerr_len + msgeol_len + 3);
    103 if (strerr) {
    104 msgc[used++] = ':';
    105 msgc[used++] = ' ';
    106 strcpy(msgc + used, strerr);
    107 used += strerr_len;
    108 }
    109 strcpy(msgc + used, msg_eol);
    110 used += msgeol_len;
    111
    112 if (logmode & LOGMODE_STDIO) {
    113 iov[0].iov_base = (char*)applet_name;
    114 iov[0].iov_len = strlen(applet_name);
    115 iov[1].iov_base = (char*)": ";
    116 iov[1].iov_len = 2;
    117 /*iov[2].iov_base = msgc;*/
    118 /*iov[2].iov_len = used;*/
    119 fflush(stdout);
    120 writev(2, iov, 3);
    121 }
    122 if (logmode & LOGMODE_SYSLOG) {
    123 syslog(LOG_ERR, "%s", msgc);
    124 }
    125 free(msgc);
    126 }
    127 #endif