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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2016-08-20 11:23:08 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2016-09-15 11:14:25 -0300 |
| commit | 91dd866ff1801b27e1db1e14a52eb89a213627e6 (patch) | |
| tree | 05093e97e9c7ba82bc6ac393f27f96b27ecf6f93 /nptl/sem_open.c | |
| parent | 980d25d53e748abd3365aeec0a1ccd1316b4e6d6 (diff) | |
| download | glibc-91dd866ff1801b27e1db1e14a52eb89a213627e6.tar.gz glibc-91dd866ff1801b27e1db1e14a52eb89a213627e6.tar.xz glibc-91dd866ff1801b27e1db1e14a52eb89a213627e6.zip | |
nptl: Set sem_open as a non cancellation point (BZ #15765)
This patch changes sem_open to not act as a cancellation point. Cancellation is disable at start and reenable in function exit. It fixes BZ #15765. Tested on x86_64 and i686. [BZ #15765] * nptl/Makefile (tests): Add tst-sem16. * nptl/tst-sem16.c: New file. * nptl/sem_open.c (sem_open): Disable asynchronous cancellation.
Diffstat (limited to 'nptl/sem_open.c')
| -rw-r--r-- | nptl/sem_open.c | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/nptl/sem_open.c b/nptl/sem_open.c index 5b45fadd71..d10828637a 100644 --- a/nptl/sem_open.c +++ b/nptl/sem_open.c @@ -31,7 +31,7 @@ #include "semaphoreP.h" #include <shm-directory.h> #include <futex-internal.h> - +#include <libc-lock.h> /* Comparison function for search of existing mapping. */ int @@ -153,6 +153,13 @@ sem_open (const char *name, int oflag, ...) /* Create the name of the final file in local variable SHM_NAME. */ SHM_GET_NAME (EINVAL, SEM_FAILED, SEM_SHM_PREFIX); + /* Disable asynchronous cancellation. */ +#ifdef __libc_ptf_call + int state; + __libc_ptf_call (__pthread_setcancelstate, + (PTHREAD_CANCEL_DISABLE, &state), 0); +#endif + /* If the semaphore object has to exist simply open it. */ if ((oflag & O_CREAT) == 0 || (oflag & O_EXCL) == 0) { @@ -193,7 +200,8 @@ sem_open (const char *name, int oflag, ...) if (value > SEM_VALUE_MAX) { __set_errno (EINVAL); - return SEM_FAILED; + result = SEM_FAILED; + goto out; } /* Create the initial file content. */ @@ -233,7 +241,10 @@ sem_open (const char *name, int oflag, ...) mode cannot later be set since then we cannot apply the file create mask. */ if (__mktemp (tmpfname) == NULL) - return SEM_FAILED; + { + result = SEM_FAILED; + goto out; + } /* Open the file. Make sure we do not overwrite anything. */ fd = __libc_open (tmpfname, O_RDWR | O_CREAT | O_EXCL, mode); @@ -247,7 +258,8 @@ sem_open (const char *name, int oflag, ...) __set_errno (EAGAIN); } - return SEM_FAILED; + result = SEM_FAILED; + goto out; } /* We got a file. */ @@ -308,5 +320,10 @@ sem_open (const char *name, int oflag, ...) errno = save; } +out: +#ifdef __libc_ptf_call + __libc_ptf_call (__pthread_setcancelstate, (state, NULL), 0); +#endif + return result; } |