10/29 ($B?e(B)
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10/22 ($B?e(B)
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static DEVICE_ATTR(local_ca_ack_delay, S_IRUGO|S_IWUGO, show_local_ca_ack_delay, store_local_ca_ack_delay);
$B$3$N%3%s%Q%$%k%(%i!<$rC)$k$H(B __ATTR()
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#define DEVICE_ATTR(_name, _mode, _show, _store) \ struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
#define __ATTR(_name, _mode, _show, _store) { \
.attr = {.name = __stringify(_name), \
.mode = VERIFY_OCTAL_PERMISSIONS(_mode) }, \
.show = _show, \
.store = _store, \
}
VERIFY_OCTAL_PERMISSIONS()
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/* Permissions on a sysfs file: you didn't miss the 0 prefix did you? */
#define VERIFY_OCTAL_PERMISSIONS(perms) \
(BUILD_BUG_ON_ZERO((perms) < 0) + \
BUILD_BUG_ON_ZERO((perms) > 0777) + \
/* User perms >= group perms >= other perms */ \
BUILD_BUG_ON_ZERO(((perms) >> 6) < (((perms) >> 3) & 7)) + \
BUILD_BUG_ON_ZERO((((perms) >> 3) & 7) < ((perms) & 7)) + \
/* Other writable? Generally considered a bad idea. */ \
BUILD_BUG_ON_ZERO((perms) & 2) + \
(perms))
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10/18 ($BEZ(B)
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10/11 ($BEZ(B)
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- $BJBNs=hM}$N
$9I,MW$,$"$k$N$, - PostgreSQL: Documemntation: 9.4: Background Worker Processes
- Michael Paquier $B;a$N(B Taking advantage of custom bgworkers PostgreSQL Conference Europe 2013
pfree()
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palloc()
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