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authorRich Felker <dalias@aerifal.cx>2014-01-08 16:12:47 -0500
committerRich Felker <dalias@aerifal.cx>2014-01-08 16:12:47 -0500
commit289294220f278a291452332da8f45cf756f57fe5 (patch)
tree289eae9f5bda95245159a8ce5e35fb328a0efe12 /src/thread/pthread_create.c
parent131871a3d846369fd925d3f8edb692edbad77e4d (diff)
downloadmusl-289294220f278a291452332da8f45cf756f57fe5.tar.gz
fix type of semctl variadic argument
per POSIX, the variadic argument has type union semun, which may contain a pointer or int; the type read depends on the command being issued. this allows the userspace part of the implementation to be type-correct without requiring special-casing for different commands. the kernel always expects to receive the argument interpreted as unsigned long (or equivalently, a pointer), and does its own handling of extracting the int portion from the representation, as needed. this change fixes two possible issues: most immediately, reading the argument as a (signed) long and passing it to the syscall would perform incorrect sign-extension of pointers on the upcoming x32 target. the other possible issue is that some archs may use different (user-space) argument-passing convention for unions, preventing va_arg from correctly obtaining the argument when the type long (or even unsigned long or void *) is passed to it.
Diffstat (limited to 'src/thread/pthread_create.c')
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