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Request XSI alongside POSIX for setpriority()/getrusage() #4735

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Request XSI alongside POSIX for setpriority()/getrusage() #4735

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6 changes: 6 additions & 0 deletions programs/platform.h
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Original file line number Diff line number Diff line change
Expand Up @@ -89,6 +89,12 @@
# ifndef _POSIX_C_SOURCE
# define _POSIX_C_SOURCE 200809L /* feature test macro : https://www.gnu.org/software/libc/manual/html_node/Feature-Test-Macros.html */
# endif
# ifndef _XOPEN_SOURCE
/* setpriority() and getrusage() are XSI, not base POSIX, so requesting
* _POSIX_C_SOURCE alone is not enough to declare them. glibc and musl
* expose them regardless; stricter libcs do not. */
# define _XOPEN_SOURCE 700
# endif
# endif
# include <unistd.h> /* declares _POSIX_VERSION */
# if defined(_POSIX_VERSION) /* POSIX compliant */
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