Extended Library Functions - Part 1
ct_event_read_critical(3CONTRACT)
ct_pr_event_get_exitstatus(3CONTRACT)
ct_pr_event_get_gcorefile(3CONTRACT)
ct_pr_event_get_pcorefile(3CONTRACT)
ct_pr_event_get_pid(3CONTRACT)
ct_pr_event_get_ppid(3CONTRACT)
ct_pr_event_get_sender(3CONTRACT)
ct_pr_event_get_senderct(3CONTRACT)
ct_pr_event_get_signal(3CONTRACT)
ct_pr_event_get_zcorefile(3CONTRACT)
ct_pr_status_get_contracts(3CONTRACT)
ct_pr_status_get_fatal(3CONTRACT)
ct_pr_status_get_members(3CONTRACT)
ct_pr_status_get_param(3CONTRACT)
ct_pr_tmpl_get_fatal(3CONTRACT)
ct_pr_tmpl_get_param(3CONTRACT)
ct_pr_tmpl_get_transfer(3CONTRACT)
ct_pr_tmpl_set_fatal(3CONTRACT)
ct_pr_tmpl_set_param(3CONTRACT)
ct_pr_tmpl_set_transfer(3CONTRACT)
ct_status_get_cookie(3CONTRACT)
ct_status_get_critical(3CONTRACT)
ct_status_get_holder(3CONTRACT)
ct_status_get_informative(3CONTRACT)
ct_status_get_nevents(3CONTRACT)
ct_status_get_nevid(3CONTRACT)
ct_status_get_ntime(3CONTRACT)
ct_status_get_qtime(3CONTRACT)
ct_status_get_state(3CONTRACT)
ct_status_get_zoneid(3CONTRACT)
ct_tmpl_get_critical(3CONTRACT)
ct_tmpl_get_informative(3CONTRACT)
ct_tmpl_set_critical(3CONTRACT)
ct_tmpl_set_informative(3CONTRACT)
dat_evd_clear_unwaitable(3DAT)
dat_get_consumer_context(3DAT)
Extended Library Functions - Part 2
Extended Library Functions - Part 3
Extended Library Functions - Part 4
- arc tangent function
c99 [ flag... ] file... -lm [ library... ] #include <math.h> double atan2(double y, double x);
float atan2f(float y, float x);
long double atan2l(long double y, long double x);
These functions compute the principal value of the arc tangent of y/x, using the signs of both arguments to determine the quadrant of the return value.
Upon successful completion, these functions return the arc tangent of y/x in the range [ -π,π ] radians.
If y is ±0 and x is < 0, ±π is returned.
If y is ±0 and x is > 0, ±0 is returned.
If y is < 0 and x is ±0, -π/2 is returned.
If y is > 0 and x is ±0, π/2 is returned.
If x is 0, a pole error does not occur.
If either x or y is NaN, a NaN is returned.
If y is ±0 and x is –0, ±π is returned.
If y is ±0 and x is +0, ±0 is returned.
For finite values of ±y > 0, if x is -Inf, ±π is returned.
For finite values of ±y > 0, if x is +Inf, ±0 is returned.
For finite values of x, if y is ±Inf, ±π/2 is returned.
If y is ±Inf and x is -Inf, ±3π/4 is returned.
If y is ±Inf and x is +Inf, ±π/4 is returned.
If both arguments are 0, a domain error does not occur.
No errors are defined.
See attributes(5) for descriptions of the following attributes:
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atan(3M), isnan(3M), math.h(3HEAD)tan(3M), attributes(5), standards(5)