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# trace -e waitid,wait4 0.557 ( 0.557 ms): bash/27335 wait4(upid: -1, stat_addr: 0x7ffd02f449f0) = 27336 1.250 ( 0.685 ms): bash/27335 wait4(upid: -1, stat_addr: 0x7ffd02f449f0) = 27337 1.312 ( 0.002 ms): bash/27335 wait4(upid: -1, stat_addr: 0x7ffd02f44690, options: NOHANG) = -1 ECHILD No child processes 1.550 ( 0.015 ms): bash/3856 wait4(upid: -1, stat_addr: 0x7ffd02f44990, options: NOHANG|UNTRACED|CONTINUED) = 27335 1.552 ( 0.001 ms): bash/3856 wait4(upid: -1, stat_addr: 0x7ffd02f44990, options: NOHANG|UNTRACED|CONTINUED) = 0 # Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/n/tip-i5vlo5n5jv0amt8bkyicmdxh@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
27 lines
629 B
C
27 lines
629 B
C
#include <sys/types.h>
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#include <sys/wait.h>
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static size_t syscall_arg__scnprintf_waitid_options(char *bf, size_t size,
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struct syscall_arg *arg)
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{
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int printed = 0, options = arg->val;
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#define P_OPTION(n) \
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if (options & W##n) { \
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printed += scnprintf(bf + printed, size - printed, "%s%s", printed ? "|" : "", #n); \
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options &= ~W##n; \
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}
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P_OPTION(NOHANG);
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P_OPTION(UNTRACED);
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P_OPTION(CONTINUED);
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#undef P_OPTION
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if (options)
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printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", options);
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return printed;
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}
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#define SCA_WAITID_OPTIONS syscall_arg__scnprintf_waitid_options
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