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Add a qemuDomainAppendLog method for writing to the domain logfile

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The qemuDomainAppendLog method allows writing a formatted string
to the end of the domain logfile, optionally opening it if needed.

* src/qemu/qemu_domain.c, src/qemu/qemu_domain.h: Add
  qemuDomainAppendLog
This commit is contained in:
Daniel P. Berrange 2011-05-05 12:40:50 +01:00
parent ce1b1f4186
commit 1f1db0b52f
2 changed files with 40 additions and 0 deletions
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36
src/qemu/qemu_domain.c
View File

@ -891,3 +891,39 @@ qemuDomainOpenLog(struct qemud_driver *driver, virDomainObjPtr vm, off_t pos)
}
int qemuDomainAppendLog(struct qemud_driver *driver,
virDomainObjPtr obj,
int logFD,
const char *fmt, ...)
{
int fd = logFD;
va_list argptr;
char *message = NULL;
int ret = -1;
va_start(argptr, fmt);
if ((fd == -1) &&
(fd = qemuDomainCreateLog(driver, obj, true)) < 0)
goto cleanup;
if (virVasprintf(&message, fmt, argptr) < 0) {
virReportOOMError();
goto cleanup;
}
if (safewrite(fd, message, strlen(message)) < 0) {
virReportSystemError(errno, _("Unable to write to domain logfile %s"),
obj->def->name);
goto cleanup;
}
ret = 0;
cleanup:
va_end(argptr);
if (fd != logFD)
VIR_FORCE_CLOSE(fd);
return ret;
}

4
src/qemu/qemu_domain.h
View File

@ -131,5 +131,9 @@ void qemuDomainObjCheckNetTaint(struct qemud_driver *driver,
int qemuDomainCreateLog(struct qemud_driver *driver, virDomainObjPtr vm, bool append);
int qemuDomainOpenLog(struct qemud_driver *driver, virDomainObjPtr vm, off_t pos);
int qemuDomainAppendLog(struct qemud_driver *driver,
virDomainObjPtr vm,
int logFD,
const char *fmt, ...) ATTRIBUTE_FMT_PRINTF(4, 5);
#endif /* __QEMU_DOMAIN_H__ */